CN113918869B - Advanced right-turn vehicle traffic capacity calculation method for non-forced priority mixed traffic travel - Google Patents
Advanced right-turn vehicle traffic capacity calculation method for non-forced priority mixed traffic travel Download PDFInfo
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Abstract
The invention discloses a calculation method of the traffic capacity of a right-turn vehicle in advance for non-forced priority mixed traffic travel, and relates to the technical field of traffic. Step 1 of the invention: establishing a relation expression of bicycle flow and motor car speed of a forward right-turning machine, and step 2: according to the existing model, solving coefficients of a relation expression of the bicycle flow and the speed of the motor car turning right in advance, and step 3: and calculating the number of vehicles passing through the conflict zone by the motor vehicle turning right in advance under the unsaturated traffic state. The invention fully describes the characteristic of non-forced preferential passing of the right-turning motor car passing through the bicycle flow in advance based on the safe driving force and the efficiency driving force of the right-turning motor car microscopic driving force model, can reflect the actual traffic running state, effectively improves the model precision, fully considers the influence of the heterogeneous bicycle traffic flow on the right-turning motor car in advance, makes up the defect of the prior method on the consideration of the heterogeneous bicycle traffic parameters, and has stronger reliability of the model calculation result.
Description
Technical Field
The invention relates to the technical field of traffic, in particular to a calculation method of the traffic capacity of a right-turn vehicle in advance for non-forced priority mixed traffic travel.
Background
The mixed traffic traveling phenomenon of motor vehicles and bicycles is an important traffic traveling feature of China, analysis of the mixed traffic traveling feature is an important basis of a refined and scientific traffic organization optimization scheme, at an urban road intersection, the conflict between a right-turning motor vehicle and a passing bicycle is an important reason for causing urban traffic jam and safety challenge, the right-turning motor vehicle is separated in advance by virtue of a right-turning diversion island to become a traffic organization means commonly adopted at the intersection, and the key of the fact that whether the means can be adopted for carrying out right-turning motor vehicle traffic organization is to calculate the traffic capacity of the right-turning motor vehicle in advance;
the existing calculation method of the passing capacity of the advanced right-turn vehicles generally assumes that the bicycles enjoy the priority passing right, and cannot describe the influence of the side-by-side running of the bicycles on the right-turn vehicles to the non-forced priority mixed traffic travel;
in order to cope with the challenge, the engineering operability is improved, and a hybrid bicycle traffic wave calculation method based on space perception is disclosed in a patent document with application publication number of CN109243174A, wherein the method is based on a space-aware hybrid traffic flow model, analyzes space ratios under different hybrid bicycle traffic states, and determines the density and flow of the hybrid bicycle;
on the basis of the method, the non-forced priority passing behavior of the right-turn motor car in the mixed bicycle traffic environment is fully considered, a right-turn car passing capacity calculation model with higher precision is established, theoretical support is provided for traffic channeling design of intersections and signal timing parameter optimization, and the limitation of the non-forced priority passing characteristic and the mixed bicycle flow consideration defect of the traditional right-turn car passing capacity calculation model is overcome.
Disclosure of Invention
The invention aims to provide a calculation method of the traffic capacity of a right-turn vehicle in advance for non-forced priority mixed traffic travel, which aims to solve the existing problems: the non-forced preferential passing behavior of the right-turn motor car in the mixed bicycle traffic environment cannot be fully considered, and the construction of the right-turn traffic capacity calculation model is not accurate enough.
In order to achieve the above purpose, the present invention provides the following technical solutions: a calculation method of the traffic capacity of a right-turn vehicle in advance for non-forced priority mixed traffic travel comprises the following specific steps:
step 1: establishing a relation expression of bicycle flow and motor car speed of a forward right-turning machine;
the V is the running speed of the motor vehicle which turns right in advance, the t is the running time of the motor vehicle which turns right in advance, the dV/dt is the derivative of the speed V of the motor vehicle which turns right in advance to the running time t, the q is the flow of the bicycle, and theFor average bicycle speed, the said C e 、k e 、C s 、C p 、k s The constant to be solved in the relational expression;
step 2: according to the existing model, solving the coefficient of the relation expression of the bicycle flow and the speed of the motor car rotating right in advance
Step 3: calculating the number of vehicles passing through the conflict zone by the motor vehicle turning right in advance under the unsaturated traffic state;
Q＝3600/t s ＝3600V/(l c +l b )
the t is s The headway of the right-turning motor vehicle passing through the conflict zone is advanced under the unsaturated traffic state, wherein the headway is that c To advance the length of the right turn collision zone, the l b The length of the right turning vehicle is advanced;
step 4: calculating the traffic capacity of the motor car turning right in advance:
the Q is m For the maximum value of the number of vehicles passing through the collision zone of the right-turn motor vehicle in advance under the unsaturated traffic state when the bicycle flow is 0, the C 0 To advance the saturation flow rate of the right-turn motor vehicle.
The step 1 comprises four steps:
the first step: the existing method obtains the perceived density k of the hybrid bicycle based on space perception:
the perceived density k can be calculated by a hybrid bicycle traffic wave calculation method based on space perception, wherein the perceived density k is disclosed in application publication number CN 109243174A;
step two, obtaining a parameter C by fitting a relation between 1/V and k p ；
Third step, by fitting the dV/dt sumObtain the relation of parameter C e ,C s ,K p
Fourth, fittingAnd lnV, obtain parameter K e ，K s 。
Compared with the prior art, the invention has the beneficial effects that:
1. the invention fully describes the characteristics of non-forced preferential passing of the right-turning motor car when passing through the bicycle flow in advance based on the safe driving force and the efficiency driving force microscopic driving force model, can reflect the actual traffic running state, and effectively improves the model precision;
2. the method fully considers the influence of the heterogeneous bicycle traffic flow on the motor car turning right in advance, makes up the defect of the conventional method on the consideration of the heterogeneous bicycle traffic parameters, and has stronger reliability of the model calculation result.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow diagram of the method of the present invention;
FIG. 2 is a schematic diagram of data acquisition points of a test area;
FIG. 3 is a schematic diagram showing the comparison of the calculated values and observed values of different models of the point location A;
FIG. 4 is a graph showing the comparison of calculated and observed values of different models of point location B;
FIG. 5 is a schematic view of the present invention for advancing a right-turn vehicle across a bicycle collision zone.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
Embodiment one:
as shown in fig. 1-4:
the method for calculating the traffic capacity of the right-turn vehicle in advance for the non-forced preferential mixed traffic travel comprises the following specific steps of:
step 1: establishing a relation expression of bicycle flow and motor car speed of a forward right-turning machine;
the V is the running speed of the motor vehicle which turns right in advance, the t is the running time of the motor vehicle which turns right in advance, the dV/dt is the derivative of the speed V of the motor vehicle which turns right in advance to the running time t, the q is the flow of the bicycle, and theFor average bicycle speed, the said C e 、k e 、C s 、C p 、k s The constant to be solved in the relational expression;
step 2: according to the existing model, solving the coefficient of the relation expression of the bicycle flow and the speed of the motor car rotating right in advance
Step 3: calculating the number of vehicles passing through the conflict zone by the motor vehicle turning right in advance under the unsaturated traffic state;
Q＝3600/t s ＝3600V/(l c +l b )
the t is s The headway of the right-turning motor vehicle passing through the conflict zone is advanced under the unsaturated traffic state, wherein the headway is that c To advance the length of the right turn collision zone, the l b The length of the right turning vehicle is advanced;
step 4: calculating the traffic capacity of the motor car turning right in advance:
the Q is m For the maximum value of the number of vehicles passing through the collision zone of the right-turn motor vehicle in advance under the unsaturated traffic state when the bicycle flow is 0, the C 0 To advance the saturation flow rate of the right-turn motor vehicle.
Step 1 is realized by the following four steps:
the first step: the existing method obtains the perceived density k of the hybrid bicycle based on space perception;
the perceived density k can be calculated by a hybrid bicycle traffic wave calculation method based on space perception, wherein the perceived density k is disclosed in application publication number CN 109243174A;
step two, obtaining a parameter C by fitting a relation between 1/V and k p ；
Third step, by fitting the dV/dt sumIs obtained from the relation of (a)Taking parameter C e ,C s ,K p ；
Fourth, fittingAnd lnV, obtain parameter K e ，K s 。
Embodiment two:
in the above embodiment, the prediction method is further verified by selecting the in-situ survey data of the east import and the west import of the intersection of the north road of the circular city and the Beijing road in Kunming, yunnan province.
Obtaining a data acquisition point schematic of the test area according to fig. 2;
the results of the analysis of the mean percent of traffic (MAPE) data by calculating the traffic ratio are shown in Table 1, and are applied to the MAPE calculation formula as follows:
model accuracy comparison of different advance right-turning motor vehicle traffic capacity models
The result shows that compared with the VISSIM simulation model, the HCM2010 model and the clearance interpenetration model, the MAPE for advancing the calculation value of the right-turn vehicle passing capacity and the actual value is minimum, the accuracy is highest, the advantages are more obvious in the traffic state with larger flow (the bicycle flow is more than 1900 bic/h/m), and the superiority of the method is fully verified.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (1)
1. The method for calculating the traffic capacity of the right-turn vehicle in advance for the non-forced priority mixed traffic trip comprises the following steps: the method comprises the following specific steps:
step 1: establishing a relation expression of bicycle flow and motor car speed of a forward right-turning machine;
the expression in the step 1 is as follows:
the V is the running speed of the motor vehicle which turns right in advance, the t is the running time of the motor vehicle which turns right in advance, the dV/dt is the derivative of the speed V of the motor vehicle which turns right in advance to the running time t, the q is the flow of the bicycle, and theFor average bicycle speed, the said C e 、k e 、C s 、C p 、k s The constant to be solved in the relational expression;
the step 1 comprises the following steps:
first step of: calculating the perceived density k of the hybrid bicycle based on spatial perception;
second step: obtaining a parameter C by fitting a relation between 1/V and k p ；
Third step: by fitting the dV/dt sumObtain the relation of parameter C e ,C s ,K p ；
Fourth step: by fittingAnd lnV, obtain parameter K e ，K s ；
Step 2: according to the existing model, solving coefficients of a relation expression of the bicycle flow and the speed of the motor car of the forward right-turning machine;
step 3: calculating the number of vehicles passing through the conflict zone by the motor vehicle turning right in advance under the unsaturated traffic state;
the calculation formula of the step 3 is as follows:
Q＝3600/t s ＝3600V/(l c +l b )
the t is s The headway of the right-turning motor vehicle passing through the conflict zone is advanced under the unsaturated traffic state, wherein the headway is that c To advance the length of the right turn collision zone, the l b The length of the right turning vehicle is advanced;
step 4: calculating the traffic capacity of the motor car turning right in advance;
the calculation formula of the fourth step is as follows:
the Q is m For the maximum value of the number of vehicles passing through the collision zone of the right-turn motor vehicle in advance under the unsaturated traffic state when the bicycle flow is 0, the C 0 To advance the saturation flow rate of the right-turn motor vehicle.
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