CN116978226A - Dynamic speed limit threshold setting and early warning method for expressway small-radius ramp - Google Patents
Dynamic speed limit threshold setting and early warning method for expressway small-radius ramp Download PDFInfo
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- G—PHYSICS
- G08—SIGNALLING
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- G08G1/00—Traffic control systems for road vehicles
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- G—PHYSICS
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- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/015—Detecting movement of traffic to be counted or controlled with provision for distinguishing between two or more types of vehicles, e.g. between motor-cars and cycles
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- G—PHYSICS
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Abstract
The application relates to the technical field of intelligent traffic safety, and discloses a method for setting and pre-warning a dynamic speed limit threshold of a small-radius ramp of a highway, which comprises the following steps: step one: collecting interchange geometric data of a highway, collecting weather information, arranging a road surface state detector on a ramp road surface to obtain road surface information at the ramp, and arranging high-precision radars at intervals at the ramp to obtain vehicle speed; step two: calculating a road adhesion coefficient mu according to ramp data, weather data and road surface information, respectively calculating a safety speed limit value for a small bus and a large truck, and establishing a ramp rainy and snowy day dynamic threshold setting model; step three: an information release device for releasing the safety speed limit information is arranged on the ramp road section, and a receiving device for receiving the safety speed limit information is arranged in the vehicle. To provide a method for dynamically limiting speed of different types of vehicles in rainy and snowy weather.
Description
Technical Field
The application relates to the technical field of intelligent traffic safety, in particular to a method for setting and early warning a dynamic speed limit threshold of a small-radius ramp of a highway.
Background
The ramp is an indispensable component in the expressway interchange, is a tie for connecting roads in different directions and converting vehicles in different directions, and is a prerequisite for ensuring safe running of vehicles by reasonable ramp design. According to the related statistics, the accident number of the ramp road sections accounts for more than 80% of the total accident number in the expressway interchange area. Therefore, how to ensure the traffic safety of the ramp road section has important significance for improving the traffic safety level of the whole expressway interchange area.
The linear condition and weather condition of the ramp are key factors affecting the driving safety of the ramp. In practice, particularly in mountain roads in western regions, the curve radius of the ramp is often determined according to the lower limit of the specification or the design value is smaller due to the limitation of the topography, the economic condition and other factors. When the automobile runs on a circular curve, besides being influenced by gravity, the automobile is also influenced by centrifugal force, when a driver drives into a ramp at a higher speed from a main line of a highway, the automobile is easy to move outwards or overturn outwards, particularly when the automobile runs into a small-radius ramp, when the speed of the automobile reaches a certain threshold value, the small bus can sideslip, and the large truck can normally roll over, particularly under severe weather conditions, such as rainy and snowy weather conditions, the friction coefficient of the road can be reduced, and the sideslip and the roll over of the automobile can be induced more easily.
Therefore, the method for calculating the dynamic speed limit threshold of the expressway interchange split-flow section small-radius ramp on the rainy and snowy days is invented by combining with different vehicle types to fully consider the geometric features and weather conditions of the expressway interchange split-flow section small-radius ramp, and has very important effects and significance for the development of the expressway interchange split-flow section small-radius ramp safe driving and early warning systems.
Disclosure of Invention
The application aims to provide a method for setting and pre-warning a dynamic speed limit threshold of a small-radius ramp of a highway so as to provide a method for dynamically limiting the speed of different types of vehicles in rainy and snowy weather.
In order to achieve the above purpose, the application adopts the following technical scheme: the method for setting and pre-warning the dynamic speed limit threshold of the expressway small-radius ramp comprises the following steps:
step one: collecting interchange geometric data of a highway, collecting weather information, and arranging a road surface state detector on a ramp road surface to obtain road surface information at the ramp;
step two: calculating a road adhesion coefficient mu according to the interchange geometric data, the weather information and the road information, respectively calculating a safety speed limit value for a small bus and a large truck, and establishing a dynamic threshold setting model of a ramp rainy and snowy day;
step three: an information release device for releasing the safety speed limit information is arranged on the ramp road section, and a receiving device for receiving the safety speed limit information is arranged in the vehicle.
The beneficial effect of this scheme is:
the ramp of the expressway is a multiple zone of traffic accidents, although drivers know that the friction force of the road surface after rain and snow is reduced compared with that of a dry road surface, due to lack of specific parameter indication, the drivers often have difficulty in accurately adjusting the speed according to actual road conditions, accidents are avoided, slipping or rapid deceleration at the ramp is easy to cause the accidents, meanwhile, the influence of the friction force on the road surface is different between a large truck and a small bus due to different heights and weights, the small bus has a lower chassis height, the gravity center is more stable, and the probability of accidents is lower; the large truck has larger weight, and the change of centrifugal force and road friction force is received at the ramp, so rollover accidents are easy to occur, and therefore, according to the geometric data of the ramp, weather information and road surface conditions, the method can calculate the speed limit threshold value of the small bus and the large truck, distinguish the two vehicles, improve the accuracy of a dynamic threshold value setting model in rainy and snowy days, and meanwhile, perform distinguishing early warning on the two vehicles, thereby reducing the accident risk.
The method is characterized in that the data source is based on the interchange geometric data of the expressway, the condition of the road is further determined through two modes of weather information and a road surface state detector, the road surface data are accurate, the accuracy of subsequent safety speed limiting information is further guaranteed, meanwhile, the speed limiting threshold value can be updated in real time along with the change of the environment, and the driver is guaranteed to always drive in the safest speed range; by arranging the information release device on the ramp section and arranging the receiving device in the vehicle, the method can timely transmit the safety speed limit information to the driver, and the early warning method can enhance the consciousness of the driver and help the driver to make corresponding speed adjustment, so that the accident risk is reduced.
Preferably, as an improvement, the interchange geometric data of the expressway in the first step comprises a curve minimum radius R, a road friction coefficient mu and a small-radius ramp maximum superhigh i;
if the road friction coefficient mu is difficult to obtain through actual measurement in rainy and snowy weather conditions, the road friction coefficient mu in a dry state can be obtained d The estimation is performed according to the following formula:
wherein: mu (mu) w Road friction coefficient in rainy and snowy days, mu d Is the road friction coefficient actually measured in the dry state.
The beneficial effects are as follows: 1. by acquiring geometric data of the expressway interchange, particularly the minimum radius R of a curve and the maximum super-high of a small-radius ramp, accurate road design parameters can be provided, the maximum super-high of the small-radius ramp can reflect the gradient condition of the ramp, the minimum radius R of the curve can illustrate the curvature condition of the ramp, and by combining the characteristic geometric data of each ramp, a reasonable speed limit value at the ramp can be deduced, so that a reference is provided for speed limit in rainy and snowy weather. 2. By using the friction coefficient in the dry state for estimation, a relatively accurate friction coefficient value can be provided in actual operation, different wet snow road surface states can be divided according to a certain range, diversified road surface state classifications can be provided, corresponding speed limiting suggestions can be provided for a driver according to the friction coefficient range estimation of different road surface states, and unnecessary risks are reduced. 3. The method is characterized in that the method is used for classifying the conditions of rainy and snowy days in detail, estimating the road friction coefficient under the conditions of rainy and snowy days according to different wet and slippery conditions and different snowfall conditions, and is more suitable for actual road operation conditions, has better applicability under any rainy and snowy weather conditions, and improves accuracy and precision for accurate speed limiting regulation and control.
Preferably, as an improvement, the safety speed limit value of the passenger car in the second step can be calculated according to the following formula:
wherein: v (V) c-l The speed is km/h for the safe driving speed of the small bus; r is the minimum radius of the curve, m; mu is the road friction coefficient, i is the maximum superhigh of the small-radius ramp, and g is the gravity acceleration.
The beneficial effects are as follows: according to the influence of the geometric parameters of the ramp and the friction coefficient of the road on the safe running of the bus on the ramp in the calculation process, the running safety of the bus is reflected more accurately, and the current weather environment running of the bus on the current ramp is regulated according to actual conditions, so that a favorable reference is provided for the running of the bus on the current weather environment of the ramp, the risk of side slip, side turn and other accidents caused by unmatched speeds is reduced, and the running safety of the ramp is improved.
Preferably, as an improvement, the safety limit value of the large truck in the second step can be calculated according to the following formula:
V t-l the safe running speed of the large truck is km/h; r is the minimum radius of the curve, m; mu is the road friction coefficient, i is the maximum superhigh of the small-radius ramp, and g is the gravity acceleration.
The beneficial effects are as follows: the large truck is greatly influenced by the friction coefficient of the road due to the differences of the volume, the height and the weight of the small truck, and the calculation formula comprehensively considers the characteristics of the large truck to ensure that the large truck runs on a small-radius ramp at a safe speed.
Preferably, as an improvement, the ramp rainy and snowy day dynamic threshold setting model is as follows:
the beneficial effects are as follows: the model calculates a dynamic speed limit threshold based on the real-time safety speed of the small bus and the large truck, and the speed limit threshold is correspondingly adjusted along with the change of real-time data so as to ensure that the speed limit threshold is always matched with the current road condition.
Preferably, as an improvement, in the third step, an information issuing device is arranged at a position B at the starting point of the ramp splitting section, a position C at which an extension line of the splitting end perpendicular to the main line intersects with the ramp, and a position D at which the minimum radius of the ramp starts, the safety speed limit information issued by the information issuing devices at the positions B, C, D is gradually decreased by 20km/h, and the speed issued by the information issuing device at the position D is a dynamic threshold V of the ramp in rainy and snowy days l 。
The beneficial effects are as follows: the information issuing device arranged at the starting point of the ramp shunting section is beneficial to reminding the ramp vehicle of starting to adjust to the adaptive vehicle speed before entering; by issuing the safety speed limit information in a descending way at 20km/h, a progressive speed limit prompt can be provided, a driver starts to gradually slow down from the position B, the speed limit information gradually decreases along with the driving-in ramp, the driver is helped to adapt to the speed change of the ramp driving, and the influence of sudden braking and sudden speed reduction on traffic flow is reduced; the multiple speed limit prompting points and progressive speed limit reduction are beneficial to strengthening traffic safety consciousness of a driver, and the driver can gradually reduce the speed of the vehicle and has more time and space to react.
Preferably, as an improvement, the receiving device in the third step is a communication display screen, and when the vehicle runs to a point a 200m before a point B at the start point of the ramp shunt section, the speed value displayed by the communication display screen is the same as the speed of the nearest information issuing device along the running direction.
The beneficial effects are as follows: through the arrangement, when the driver approaches the ramp entrance, the driver can obtain the current speed limit information on the communication display screen, so that the speed limit condition can be known before the driver enters the ramp, and more time is available for preparing for speed reduction.
Preferably, as an improvement, the information release device is an electronic variable speed limit sign, the electronic variable speed limit sign comprises a solar panel, a square yellow flashing light, an electronic speed limit sign and a ramp auxiliary sign board which are sequentially arranged on the vertical rod from top to bottom, the solar panel is electrically connected with the square yellow flashing light and the electronic speed limit sign board, and the outer surface of the ramp auxiliary sign board is coated with a black and white engineering grade reflecting film.
The beneficial effects are as follows: the information release device has higher visibility under dim light or night conditions, the reflective film can effectively reflect light, the brightness of the sign is improved, and a driver can more easily notice speed limit information under long-distance and bad weather conditions; the solar panel is used as a power supply, an external power supply is not needed, energy conservation is facilitated, the influence on the environment is reduced, and the concept of sustainable development is met.
Drawings
FIG. 1 is a flow chart of a method of an embodiment of the present application;
FIG. 2 is a schematic diagram of electronically variable speed limit sign position in accordance with an embodiment of the present application;
FIG. 3 is a schematic diagram of an electronically variable speed limit sign according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a communication display screen placement position according to an embodiment of the present application;
fig. 5 is a schematic diagram of display content of a communication display according to an embodiment of the present application.
Detailed Description
The following is a further detailed description of the embodiments:
reference numerals in the drawings of the specification include: the electronic speed limiting sign comprises an electronic variable speed limiting sign 1, a communication display screen 2, an automobile 3, a vertical rod 11, a ramp auxiliary signboard 12, an electronic speed limiting sign 13, a square yellow flashing lamp 14 and a solar panel 15.
Examples
The application adopts the following technical scheme: the method for setting and pre-warning the dynamic speed limit threshold of the expressway small-radius ramp comprises the following steps:
step one: as shown in fig. 1, the method is suitable for the interchange small-radius ramp of the expressway with the radius range of 30 m-80 m.
The interchange geometric data of the expressway comprises a curve minimum radius R, a road friction coefficient mu and a small-radius ramp maximum superhigh i. The method is characterized in that the data source is based on the interchange geometric data of the expressway, the condition of the expressway is further determined through two modes of weather information and a road surface state detector, the road surface data is ensured to be accurate, the accuracy of subsequent safe speed limit information is further ensured, accurate road design parameters can be provided by acquiring the geometric data of the interchange of the expressway, particularly the minimum radius R of a curve and the maximum super-high of a small radius ramp, the maximum super-high of the small radius ramp can reflect the gradient condition of the ramp, the minimum radius R of the curve can account for the curvature condition of the ramp, the reasonable speed limit value at the ramp can be deduced by combining the characteristic geometric data of each ramp, and a reference is provided for the speed limit of rainy and snowy weather.
Step two: calculating the road adhesion coefficient mu according to ramp data, weather data and road surface information,
if the road friction coefficient mu is difficult to obtain through actual measurement in rainy and snowy weather, the method can obtain the dry roadMu after road friction coefficient in dry state d The estimation is performed according to the following formula:
wherein: mu (mu) w Road friction coefficient in rainy and snowy days, mu d Is the road friction coefficient actually measured in the dry state.
The method is characterized in that the method is used for classifying the conditions of rainy and snowy days in detail, estimating the road friction coefficient under the conditions of rainy and snowy days according to different wet and slippery conditions and different snowfall conditions, and is more suitable for actual road operation conditions, has better applicability under any rainy and snowy weather conditions, and improves accuracy and precision for accurate speed limiting regulation and control.
The safety speed limit value is calculated for the small bus, and the safety speed limit value of the small bus can be calculated according to the following formula:
wherein: v (V) c-l The speed is km/h for the safe driving speed of the small bus; r is the minimum radius of the curve, m; mu is the road friction coefficient, i is the maximum superhigh of the small-radius ramp, and g is the gravity acceleration.
According to the influence of the geometric parameters of the ramp and the friction coefficient of the road on the safe running of the bus on the ramp in the calculation process, the running safety of the bus is reflected more accurately, and the current weather environment running of the bus on the current ramp is regulated according to actual conditions, so that a favorable reference is provided for the running of the bus on the current weather environment of the ramp, the risk of side slip, side turn and other accidents caused by unmatched speeds is reduced, and the running safety of the ramp is improved.
The safety speed limit value is calculated for the large truck, and the safety speed limit value of the large truck can be calculated according to the following formula:
V t-l the safe running speed of the large truck is km/h; r is the minimum radius of the curve, m; mu is the road friction coefficient, i is the maximum superhigh of the small-radius ramp, and g is the gravity acceleration.
The large truck is greatly influenced by the friction coefficient of the road due to the differences of the volume, the height and the weight of the small truck, and the calculation formula comprehensively considers the characteristics of the large truck to ensure that the large truck runs on a small-radius ramp at a safe speed.
Therefore, according to the geometric data, weather information and road surface conditions of the ramp, the method can calculate the speed limit threshold value for the small bus and the large truck, distinguish the two vehicles, improve the accuracy of a dynamic threshold value setting model in rainy and snowy days, and meanwhile, perform distinguishing early warning on the two vehicles, so that the accident risk is reduced.
Establishing a dynamic threshold setting model of the ramp rainy and snowy days, wherein the dynamic threshold setting model of the ramp rainy and snowy days is as follows:
step three: as shown in fig. 2, an information release device for releasing safety speed limit information is arranged on a ramp section, an information release device is arranged at a position B at the starting point of a ramp shunt section, a position C at which a shunt end is perpendicular to an extension line of a main line and the ramp intersects with the ramp and a position D at the minimum radius of the ramp, the safety speed limit information released by the information release devices at the position B, C, D is gradually decreased by 20km/h, and the speed released by the information release device at the position D is a dynamic threshold V on the rainy and snowy days of the ramp l . The information release device arranged at the starting point of the ramp shunting section is beneficial to reminding the ramp vehicle to start to adjust to the adaptive vehicle speed before entering; by issuing the safety speed limit information in a descending way at 20km/h, a progressive speed limit prompt can be provided, a driver starts to gradually slow down from the position B, the speed limit information gradually decreases along with the driving-in ramp, the driver is helped to adapt to the speed change of the ramp driving, and the influence of sudden braking and sudden speed reduction on traffic flow is reduced; multiple speed limit cues and progressive speed limit reduction to help strengthen drivingThe driver's traffic safety consciousness, the driver can step down the speed of a motor vehicle, has more time and space to react.
The information issuing device in this embodiment is an electronic variable speed limit sign 1, as shown in fig. 3, the electronic variable speed limit sign 1 includes a solar panel 15, a square yellow flashing light 14, an electronic speed limit sign 13 and a ramp auxiliary sign board 12 which are sequentially arranged on a vertical rod 11 from top to bottom, the solar panel 15 is electrically connected with the square yellow flashing light 14 and the electronic speed limit sign board 13, and a black and white engineering grade reflective film is coated on the outer surface of the ramp auxiliary sign board 12. The information release device has higher visibility under dim light or night conditions, the reflective film can effectively reflect light, the brightness of the sign is improved, and a driver can more easily notice speed limit information under long-distance and bad weather conditions; the solar panel 15 is used as a power supply, does not need an external power supply, is beneficial to saving energy, reduces the influence on the environment, and accords with the concept of sustainable development.
The receiving device (shown in fig. 4) for receiving the safety speed limit information is arranged in the vehicle, the receiving device is a communication display screen 2, the optimal speed limit information of different road sections is displayed in the vehicle communication display screen 2, and the effects of 'early speed reduction' and 'slow speed reduction' at different areas of the interchange shunting section of the expressway are realized mainly aiming at different vehicles provided with communication modules. When the vehicle is driven to the point a 200m before the point B at the start point of the ramp diverging section as shown in fig. 2, the communication display screen 2 displays the same speed value as the speed of the nearest information issuing device along the driving direction, the communication display screen 2 is shown in fig. 5, and the driver can obtain the current speed limit information on the communication display screen 2, so that the speed limit condition can be known before entering the ramp, and more time is available for preparation for speed reduction.
Taking a small-radius ramp of a certain expressway interchange shunting section as an example, a dynamic speed limit threshold setting and early warning method of the small-radius ramp of the expressway is specifically adopted.
1) The investigation shows that the basic data of the small radius ramp of the interchange shunting section of the expressway in the initial state are shown in the table 1 and stored in the data storage module:
TABLE 1 Highway interchange split-flow section small radius ramp basic data
| R | i | μ d |
| 60 | 0.01 | 0.8 |
2) The weather conditions in rainy and snowy days and the real-time conditions of the road are collected through the collecting and calculating module, and the friction coefficient mu of the road in rainy and snowy days is calculated according to the conditions of the snowy days w And (3) performing estimation:
μ w ＝0.2
3) The related data are carried into and calculated to obtain the small-radius ramp anti-sideslip critical safety speed of the small bus and the small-radius ramp anti-sideslip critical safety speed of the large truck:
V c-l ＝45.42(km/h)
V t-l ＝43.40(km/h)
4) Calculating a speed limit value of a dynamic threshold value of the interchange small-radius ramp rainy and snowy days:
V l ＝|min(V c-l ，V t-l )|＝|min(45.42,43.40)|＝43(km/h)
5) An electronic variable speed limiting device is arranged at the starting point of the ramp shunting section, and the speed limiting device displays speed limiting of 80km/h; the split end is perpendicular to the C-electronic variable speed limiting device at the intersection of the extension line of the main line and the ramp, and the display speed limit is 60km/h; d electronic variable speed limiter at the beginning of the minimum radius of ramp, which shows speed limit of 43km/h.
6) When the automobile 3 runs to a position A200 m before the start point of the shunt section, the in-car communication display screen 2 displays speed limit 80km/h; when the automobile 3 runs between a starting point B of the shunt section and an intersection C of an extension line of the shunt end perpendicular to the main line and the ramp, the in-car communication display screen 2 displays speed limit of 60km/h; when the automobile 3 runs to a position between the intersection C of the extension line of the shunting end perpendicular to the main line and the ramp and the minimum radius start position D of the ramp, the in-car communication display screen 2 displays the speed limit of 43km/h.
The application also aims to provide a system for setting and pre-warning the dynamic speed limit threshold of the expressway small-radius ramp, which is suitable for the method for setting and pre-warning the dynamic speed limit threshold of the expressway small-radius ramp, and comprises the following steps:
and a data storage module: storing the interchange geometric data and weather information of the expressway which are acquired in advance;
and the acquisition and calculation module is used for: the method comprises the steps of detecting the speed of the automobile 3 in real time by high-precision radars arranged at intervals at the ramp positions, and calculating the safety speed limit values of different automobiles 3 in different sections; calculating a road adhesion coefficient mu according to ramp data, weather data and road surface information;
the information release module: the system comprises a communication module which distributes safety speed limit information and is connected with a highway management center, a communication display screen 2 and an information distribution device.
The foregoing is merely exemplary of the present application, and specific technical solutions and/or features that are well known in the art have not been described in detail herein. It should be noted that, for those skilled in the art, several variations and modifications can be made without departing from the technical solution of the present application, and these should also be regarded as the protection scope of the present application, which does not affect the effect of the implementation of the present application and the practical applicability of the patent. The protection scope of the present application is subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.
Claims (8)
1. The method for setting and pre-warning the dynamic speed limit threshold of the expressway small-radius ramp is characterized by comprising the following steps of: the method comprises the following steps:
step one: collecting interchange geometric data of a highway, collecting weather information, and arranging a road surface state detector on a ramp road surface to obtain road surface information at the ramp;
step two: calculating a road adhesion coefficient mu according to the interchange geometric data, the weather information and the road information, respectively calculating a safety speed limit value for a small bus and a large truck, and establishing a dynamic threshold setting model of a ramp rainy and snowy day;
step three: an information release device for releasing the safety speed limit information is arranged on the ramp road section, and a receiving device for receiving the safety speed limit information is arranged in the vehicle.
2. The method for setting and pre-warning the dynamic speed limit threshold of the expressway small-radius ramp according to claim 1, which is characterized in that: the interchange geometric data of the expressway in the first step comprises a curve minimum radius R, a road friction coefficient mu and a small-radius ramp maximum superhigh i;
if the road friction coefficient mu is difficult to obtain through actual measurement in rainy and snowy weather conditions, the road friction coefficient mu in a dry state can be obtained d The estimation is performed according to the following formula:
3. the method for setting and pre-warning the dynamic speed limit threshold of the expressway small-radius ramp according to claim 2, which is characterized in that: the safety speed limit value of the small bus in the second step can be calculated according to the following formula:
4. the method for setting and pre-warning the dynamic speed limit threshold of the expressway small-radius ramp according to claim 2, which is characterized in that: the safety speed limit value of the large truck in the second step can be calculated according to the following formula:
5. the method for setting and pre-warning the dynamic speed limit threshold of the expressway small-radius ramp according to claim 3 or 4, which is characterized in that: the dynamic threshold setting model of the ramp rainy and snowy days is as follows:
6. the method for setting and pre-warning the dynamic speed limit threshold of the expressway small-radius ramp according to claim 5, which is characterized in that: in the third step, an information release device is arranged at the starting point B of the ramp shunt segment, the intersection C of an extension line of the shunt end perpendicular to the main line and the ramp and the minimum radius starting point D of the ramp, the safety speed limit information released by the information release device at the B, C, D three positions is gradually decreased by 20km/h, and the speed released by the information release device at the D position is the dynamic threshold V of the ramp in rainy and snowy days l 。
7. The method for setting and pre-warning the dynamic speed limit threshold of the expressway small-radius ramp according to claim 6, which is characterized in that: in the third step, the receiving device is a communication display screen, and when the vehicle runs to a point A200 m before a point B at the starting point of the ramp shunting section, the speed value displayed by the communication display screen is the same as the speed of the nearest information release device along the running direction.
8. The method for setting and pre-warning the dynamic speed limit threshold of the expressway small-radius ramp according to claim 7, which is characterized in that: the information issuing device is an electronic variable speed limiting sign, the electronic variable speed limiting sign comprises a solar panel, a square yellow flashing light, an electronic speed limiting sign and a ramp auxiliary sign board, wherein the solar panel, the square yellow flashing light, the electronic speed limiting sign board and the ramp auxiliary sign board are sequentially arranged on the vertical rod from top to bottom, the solar panel is electrically connected with the square yellow flashing light and the electronic speed limiting sign board, and the outer surface of the ramp auxiliary sign board is coated with a black-white engineering grade reflecting film.
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| CN202310965734.2A CN116978226A (en) | 2023-07-31 | 2023-07-31 | Dynamic speed limit threshold setting and early warning method for expressway small-radius ramp |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116186850A (en) * | 2023-01-31 | 2023-05-30 | 福建省高速公路科技创新研究院有限公司 | Method for determining minimum radius of circular curve of expressway special for small bus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116186850A (en) * | 2023-01-31 | 2023-05-30 | 福建省高速公路科技创新研究院有限公司 | Method for determining minimum radius of circular curve of expressway special for small bus |
| CN116186850B (en) * | 2023-01-31 | 2024-06-18 | 福建省高速公路科技创新研究院有限公司 | Method for determining minimum radius of circular curve of expressway special for small bus |
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