CN105279980A - Method for judging whether signal control intersection adapts to continuous flow intersection transformation - Google Patents
Method for judging whether signal control intersection adapts to continuous flow intersection transformation Download PDFInfo
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Abstract
The invention discloses a method for judging whether a signal control intersection adapts to continuous flow intersection transformation. According to the method, whether a signal control intersection satisfies the basic condition, infrastructure condition, flow condition and flow ratio condition for setting a continuous flow intersection is analyzed sequentially, whether the corresponding signal control intersection is suitable for continuous flow intersection transformation is judged only when all the conditions are met, and that the signal control intersection is not suitable for continuous flow intersection transformation is judged if there is one condition which cannot be satisfied. The method has the advantages of clear and concise using conditions, convenient and quick operation, and high reliability. After a signal control intersection is transformed into a continuous flow intersection, traffic congestion on the entrance lane of the signal control intersection can be reduced, and the traffic capacity of the intersection can be improved.
Description
Technical field
Intersection design field in traffic engineering of the present invention, is specifically related to a kind of method whether signalized crossing is applicable to the transformation of continuous stream crossing that judges.
Background technology
Continuous stream crossing (CFI:ContinuousFlowIntersection) is also known as " transfer is turned left " (XDL:CroS1overDisplacedLeft-turn) scheme., in a distance, upstream, crossing, the left turn traffic of import is transferred to the non-traditional design proposal of the outermost one in subtend straightgoing vehicle flow export track.Control crossing compared to classical signal, CFI has the larger traffic capacity, reduces and incur loss through delay and improve security; Compared to traffic interchange, CFI construction cost is little, construction speed is fast.Current North America has ten Yu Chu crossings to have employed the design of CFI.Compare North America traffic, domestic urban transportation is more complicated.Along with the swift and violent growth of vehicle guaranteeding organic quantity in recent years, the city that crossing blocks up on a large scale gets more and more, continuous stream crossing (CFI) is since advantage is fairly obvious, whether be applicable to China's urban intersection, how clear and definite which kind of intersect eloquence and be suitable for, determine the method for continuous stream crossing for the function playing urban intersection better, improve crossing the traffic capacity very important.
Summary of the invention
The present invention seeks to: for above-mentioned technical matters, domestic actual conditions are more met in order to make to arrange continuous stream crossing, a kind of method whether signalized crossing is applicable to continuous stream crossing (CFI) and transforms that judges is provided, be intended to solve and how judge whether crossing is applicable to the problem of CFI construction, control crossing compared to classical signal, CFI has the larger traffic capacity, reduces and incur loss through delay and improve security; Compared to traffic interchange, CFI construction cost is little, construction speed is fast.
Technical scheme of the present invention is: a kind of judge signalized crossing whether be applicable to continuous stream crossing transformation method, comprise the following steps:
S1: using the foundation of each for signalized crossing entrance driveway direction as traffic data collection;
S2: gather traffic data;
The traffic data gathered comprises the volume of traffic that each entrance driveway arrived in the peak hour, this volume of traffic comprises various motor vehicle, various bicycle and ground, the crossing pedestrian crossing volume of traffic, the automobile traffic amount of acquisition is become stoichiometric standard car transportation amount by following formula scales: V
e=V Σ P
ie
i;
Wherein: V
efor stoichiometric standard car transportation amount, measurement unit is/hour; V is the total wheel traffic without converting, and measurement unit is/hour; P
ibe the number percent that the i-th class car volume of traffic accounts for total wheel traffic; E
iit is the vehicle conversion factor of the i-th class car; I represents large car or car;
S3: detect traffic components, if not motor vehicle share rate >=5%, then judge that continuous stream crossing is inapplicable, now judged result goes out, step stops; Otherwise (i.e. bicycle share rate < 5%), then carry out following step S4 ~ S6, judge further;
S4: the traffic capacity calculating each entrance driveway, access mouth design capacity equals each lane design traffic capacity sum; The design capacity computing formula of single straight runway is
wherein C
sfor the design capacity of single straight runway, measurement unit is pcu/h; T
cfor signal lamp cycle, measurement unit is s; t
gfor the green time in signal each cycle, measurement unit is s; t
0after green light, first car starts, by time of stop line, measurement unit is s; t
ifor keep straight on or right lateral vehicle by averaging time of stop line, measurement unit is s/pcu;
for reduction coefficient;
The design capacity computing formula of wall scroll right-turn lane is C
sr=C
s, wherein, C
srfor the design capacity of wall scroll right-turn lane, measurement unit is pcu/h;
The design capacity computing formula of wall scroll left turn lane is C
sl=C
s(1-β
l'/2), wherein C
slfor the design capacity of wall scroll left turn lane, measurement unit is pcu/h; β
l' be the car proportion that turns left in straight-left lane;
The saturation computation formula of wall scroll entrance driveway is
wherein λ is the saturation degree of entrance driveway; V
efor the stoichiometric standard car transportation amount that this entrance driveway of unit time arrives; C is the traffic capacity of this entrance driveway;
If the traffic saturation degree in a certain group of subtend track is all greater than 0.8, then this group subtend track meets the flow condition arranging continuous stream crossing, carries out following step S5 to it; Otherwise (namely this group subtend track traffic saturation degree and not all is greater than 0.8), then judge that continuous stream crossing is inapplicable;
S5: detect the satisfied subtend pedestrian crossing amount that the flow condition direction of continuous stream crossing is set and whether be greater than 300 person-times/hour, if be greater than 300 person-times/hour, then do not meet setting model, judge that continuous stream crossing is inapplicable, now judged result goes out, and step stops; If be not more than 300 person-times/hour, then carry out following step S6, judge further;
S6: when meeting the direction of above-mentioned steps S4 flow condition, when wall scroll left-turn volume and straight-going traffic amount ratio are greater than 1/2 and are less than 3/2, then final judgement is suitable for carrying out the transformation of continuous stream crossing; Otherwise, then judge that continuous stream crossing is inapplicable.
As preferably, between described step S3 and step S4, also carry out following three steps:
1.: detect within the scope of the red line of crossing whether have transformation space;
2.: detect within the scope of 150 meters, intersection channelizing section upstream whether have bus platform;
3.: detect within the scope of 150 meters, intersection channelizing section upstream whether have access opening;
Above-mentioned steps order 1., 2. and 3. in no particular order;
4.: above-mentioned steps 1., 2. and 3. in, under only having the condition meeting at the same time and do not have bus platform and access opening within the scope of well-to-do, 150 meters, intersection channelizing section upstream, transformation space, just carry out described step S4, judge further; Otherwise (transformation space is well-to-do not, or have bus platform within the scope of 150 meters, intersection channelizing section upstream, or have access opening within the scope of 150 meters, intersection channelizing section upstream), then judge that continuous stream crossing is inapplicable, now judged result goes out, and step stops.
Above-mentioned steps enforcement 1., 2., 3. and is 4. a kind of optimization technique means, not absolute means.If transformation space is well-to-do not, or have bus platform within the scope of 150 meters, intersection channelizing section upstream, or have access opening within the scope of 150 meters, intersection channelizing section upstream, so we also can overcome these problems according to actual conditions, and select to proceed described step S4.Namely step enforcement 1., 2., 3. and is not 4. as inflexible target requirement, only as important reference frame.
As preferably, in described step S1, when gathering traffic data, can be obtained by historical data, also can carry out data acquisition by camera method.
As preferably, in described step S4, we calculate the traffic capacity of each entrance driveway according to " urban road design criterion " (CJJ37-2012).
As preferably, described step 4. in, described " transformation space is well-to-do ", typically refers to the transformation space that there are more than 5 meters width both sides, walkway.
As preferably, in above-mentioned computing formula
in, t
0be generally 2.3s,
be generally 0.9.
This method is particularly useful for intersection or T-junction mouth, and when namely the method is applied to the signalized crossing of intersection or T-junction mouth, best results, reliability is the highest.If finally judge that intersection is applicable to carry out CFI transformation, then it at least can arrange one group of CFI.If finally judge that T-junction mouth is applicable to carry out CFI transformation, then it at least can arrange an entrance driveway CFI.
Advantage of the present invention is: can judge that classical signal controls crossing and whether is suitable for being transformed into continuous stream crossing (CFI) fast by method proposed by the invention, the method service condition is short and sweet, convenient and swift, and reliability is high.After being transformed into continuous stream crossing, signalized crossing entrance driveway congested traffic condition can be reduced, improve intersection capacity.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described:
Fig. 1 is the face figure of signalized crossing before CFI transformation in the embodiment of the present invention;
Fig. 2 is the planimetric map through the improved signalized crossing of CFI in the embodiment of the present invention.
Embodiment
Signalized crossing (T-junction mouth) planimetric map according to Fig. 1 and the vehicle flow shown in table 1, current northing stomatodeum evening peak reaches 4100pcu/h, traffic congestion is relatively more serious, just can consider to carry out the transformation of continuous stream crossing when T-junction mouth has an entrance driveway saturation degree larger.Determine whether this signalized crossing is suitable for the method transformed continuous stream crossing as follows:
(1) the automobile traffic amount that crossing each entrance driveway arrives in the peak hour is gathered as shown in table 1;
(2) enquiry data is megalopolis, west of Guangdong Province Yuexi one place T-junction mouth, bicycle ratio is very low, in this example, this crossing bicycle share rate (is less than 5%) less than 1%, meets the basic condition arranging continuous stream crossing (CFI); Described bicycle share rate is the ratio of the number sum adopting the number of bicycle trip and adopt non-maneuver and Vehicle emission, and its implication is known in the industry.
(3) north side intersection red line inside lane and walkway wider, transformation condition is better, and within the scope of 150 meters, northing mouth canalization section upstream, crossing, bus platform is not set, and do not access road and opening, possess the facility condition that continuous stream crossing (CFI) is set;
(4) saturation degree of northing stomatodeum is calculated according to the computing method in technical solution of the present invention step S4
meet the flow condition that continuous stream crossing (CFI) is set;
(5) detecting ground, northing mouth walkway pedestrian crossing is 140 person-times/hour, is less than 300 person-times/hour, meets the ground pedestrian crossing volume of traffic threshold condition arranging continuous stream crossing (CFI);
(6) calculate northing stomatodeum wall scroll to turn left and straight-going traffic amount ratio: northing stomatodeum is 3 Through Lanes, 2 left turn lanes, therefore
between 1/2 to 3/2, meet the flow proportional condition that continuous stream crossing (CFI) is set.
In sum, signalized crossing shown in Fig. 1 meets the basic condition, facility condition, flow condition and the flow proportional condition that arrange continuous stream crossing (CFI) simultaneously, we finally judge that continuous stream crossing (CFI) transformation can be carried out in this crossing, as Fig. 2, according to assessment result, the traffic capacity at evening peak crossing promotes about 10%.
Above-described embodiment, only for technical conceive of the present invention and feature are described, its object is to people can be understood content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalent transformations of doing according to the Spirit Essence of main technical schemes of the present invention or modification, all should be encompassed within protection scope of the present invention.
Claims (7)
1. judge whether signalized crossing is applicable to a method for continuous stream crossing transformation, it is characterized in that the method comprises the following steps:
S1: using the foundation of each for signalized crossing entrance driveway direction as traffic data collection;
S2: gather traffic data;
The traffic data gathered comprises the volume of traffic that each entrance driveway arrived in the peak hour, this volume of traffic comprises various motor vehicle, bicycle and ground, the crossing pedestrian crossing volume of traffic, the automobile traffic amount of acquisition is become stoichiometric standard car transportation amount by following formula scales: V
e=V Σ P
ie
i;
Wherein: V
efor stoichiometric standard car transportation amount, measurement unit is/hour; V is the total wheel traffic without converting, and measurement unit is/hour; P
ibe the number percent that the i-th class car volume of traffic accounts for total wheel traffic; E
iit is the vehicle conversion factor of the i-th class car; I represents large car or car;
S3: detect traffic components, if not motor vehicle share rate >=5%, then judge that continuous stream crossing is inapplicable; Otherwise, then following step S4 ~ S6 is carried out;
S4: the traffic capacity calculating each entrance driveway, access mouth design capacity equals each lane design traffic capacity sum; The design capacity computing formula of single straight runway is
wherein C
sfor the design capacity of single straight runway, measurement unit is pcu/h; T
cfor signal lamp cycle, measurement unit is s; t
gfor the green time in signal each cycle, measurement unit is s; t
0after green light, first car starts, by time of stop line, measurement unit is s; t
ifor keep straight on or right lateral vehicle by averaging time of stop line, measurement unit is s/pcu;
for reduction coefficient;
The design capacity computing formula of wall scroll right-turn lane is C
sr=C
s, wherein, C
srfor the design capacity of wall scroll right-turn lane, measurement unit is pcu/h;
The design capacity computing formula of wall scroll left turn lane is C
sl=C
s(1-β '
l/ 2), wherein C
slfor the design capacity of wall scroll left turn lane, measurement unit is pcu/h; β '
lfor the car proportion that turns left in straight-left lane;
The saturation computation formula of wall scroll entrance driveway is
wherein λ is the saturation degree of entrance driveway; V
efor the stoichiometric standard car transportation amount that this entrance driveway of unit time arrives; C is the traffic capacity of this entrance driveway;
If the traffic saturation degree in a certain group of subtend track is all greater than 0.8, then this group subtend track meets the flow condition arranging continuous stream crossing, carries out following step S5 to it; Otherwise then judge that continuous stream crossing is inapplicable, step stops;
S5: detect the satisfied subtend pedestrian crossing amount that the flow condition direction of continuous stream crossing is set and whether be greater than 300 person-times/hour, if be greater than 300 person-times/hour, then do not meet setting model, judge that continuous stream crossing is inapplicable; If be not more than 300 person-times/hour, then carry out following step S6;
S6: when meeting the direction of above-mentioned steps S4 flow condition, when wall scroll left-turn volume and straight-going traffic amount ratio are greater than 1/2 and are less than 3/2, then final judgement is suitable for carrying out the transformation of continuous stream crossing; Otherwise, then judge that continuous stream crossing is inapplicable.
2. according to claim 1 judge signalized crossing whether be applicable to continuous stream crossing transformation method, it is characterized in that: between described step S3 and step S4, also carry out following three steps:
1.: detect within the scope of the red line of crossing whether have transformation space;
2.: detect within the scope of 150 meters, intersection channelizing section upstream whether have bus platform;
3.: detect within the scope of 150 meters, intersection channelizing section upstream whether have access opening;
Above-mentioned steps order 1., 2. and 3. in no particular order;
4.: above-mentioned steps 1., 2. and 3. in, under only having the condition meeting at the same time and do not have bus platform and access opening within the scope of well-to-do, 150 meters, intersection channelizing section upstream, transformation space, just carry out described step S4, judge further; Otherwise then judge that continuous stream crossing is inapplicable, step stops.
3. according to claim 1 and 2 judge signalized crossing whether be applicable to continuous stream crossing transformation method, it is characterized in that: in described step S1, when gathering traffic data, obtained by historical data, or carry out data acquisition by camera method.
4. according to claim 1 and 2 judge signalized crossing whether be applicable to continuous stream crossing transformation method, it is characterized in that: in described step S4, calculate the traffic capacity of each entrance driveway according to " urban road design criterion " (CJJ37-2012).
5. according to claim 2 judge signalized crossing whether be applicable to continuous stream crossing transformation method, it is characterized in that: described step 4. in, described " transformation space is well-to-do ", refers to that there is the transformation space of more than 5 meters width both sides, walkway.
6. according to claim 1 and 2 judge signalized crossing whether be applicable to continuous stream crossing transformation method, it is characterized in that: in above-mentioned computing formula
in, t
0for 2.3s,
be 0.9.
7. according to claim 1 and 2 judge signalized crossing whether be applicable to continuous stream crossing transformation method, it is characterized in that: described signalized crossing is intersection or T-junction mouth.
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| CN109377771A (en) * | 2018-11-26 | 2019-02-22 | 启迪设计集团股份有限公司 | The demand determination method and device of external left turn lane is arranged in signalized intersections |
| CN109523808A (en) * | 2018-12-27 | 2019-03-26 | 长安大学 | A kind of canalization optimization method shifting left-hand rotation intersection |
| CN112085955A (en) * | 2020-09-04 | 2020-12-15 | 东南大学 | Channelized design optimization method for continuous flow intersection |
| CN113096384A (en) * | 2021-03-16 | 2021-07-09 | 启迪设计集团股份有限公司 | Method and device for judging traffic control in arrayed mode set at intersection |
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| CN108399759A (en) * | 2018-02-23 | 2018-08-14 | 上海理工大学 | Continuous flow intersection left-turn non-motor traffic design method |
| CN108399759B (en) * | 2018-02-23 | 2020-10-09 | 上海理工大学 | Traffic design method for continuous flow intersection left-turn non-motor vehicles |
| CN109377771B (en) * | 2018-11-26 | 2021-07-09 | 启迪设计集团股份有限公司 | Demand judgment method and device for arranging external left-turn lane at signalized intersection |
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| CN113362621A (en) * | 2021-06-04 | 2021-09-07 | 哈尔滨工业大学 | Oblique-insertion type crossing method and system for left-turning non-motor vehicles at parallel flow intersection |
| CN114530046A (en) * | 2022-01-28 | 2022-05-24 | 启迪设计集团股份有限公司 | Method and device for judging requirement of setting right turn signal lamp at intersection |
| CN115116219A (en) * | 2022-06-07 | 2022-09-27 | 启迪设计集团股份有限公司 | Method for judging setting requirements of non-motor vehicle waiting area |
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| CN115223368A (en) * | 2022-08-08 | 2022-10-21 | 启迪设计集团股份有限公司 | Method for judging whether non-motor vehicle lane is suitable for being transformed into unilateral bidirectional traffic |
| CN115223368B (en) * | 2022-08-08 | 2023-12-29 | 启迪设计集团股份有限公司 | Method for judging whether non-motor vehicle lane is suitable for being transformed into unilateral bidirectional traffic |
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