CN104282148B - A kind of method obtaining the intersection Dai Hang district traffic capacity - Google Patents

Abstract

The present invention relates to a kind of method obtaining the intersection Dai Hang district traffic capacity, comprise the following steps: 1) gather crossing's Dai Hang district type, treat row section length and Traffic Signal Timing information；2) according to treating that row section length calculates corresponding Dai Hang district capacity；3) according to the startup lost time that Dai Hang district type is corresponding with Dai Hang district calculation of capacity；4) according to starting lost time, Dai Hang district capacity and the Traffic Signal Timing information calculating Dai Hang district traffic capacity.Compared with prior art, the present invention has convenience of calculation, degree of accuracy advantages of higher.

Description

A Method for Acquiring Traffic Capacity of Waiting Area at Road Intersection

technical field

The invention relates to the field of traffic control, in particular to a method for acquiring the traffic capacity of a waiting area at a road intersection.

Background technique

Nowadays, most intersections are equipped with waiting areas. The purpose of the waiting area is to release more internal space at the intersection and increase the capacity of the entrance road without affecting the traffic, so as to relieve the traffic pressure and improve the traffic efficiency. Although there are many similar studies and explorations related to the traffic capacity of waiting areas in China, there is no unified traffic capacity calculation standard for domestic traffic characteristics. In traffic design and evaluation, this will inevitably increase the difference between calculation results and actual conditions. The extent to which the situation does not match.

Therefore, a set of calculation methods specifically for the capacity of the waiting area has a certain positive significance and effect on traffic design, evaluation, planning, better management of urban roads, and promotion of urban development.

Contents of the invention

The object of the present invention is to provide a method for obtaining the traffic capacity of a waiting area at a road intersection with high accuracy in order to overcome the above-mentioned defects in the prior art.

The purpose of the present invention can be achieved through the following technical solutions:

A method for obtaining traffic capacity of a waiting area at a road intersection, comprising the following steps:

1) Collect information on the type of waiting area at the intersection, the length of the waiting area, and the timing of traffic signals;

2) Calculate the corresponding capacity of the waiting area according to the length of the waiting area;

3) Calculate the corresponding start-up loss time according to the type of waiting area and the capacity of the waiting area;

4) Calculate the traffic capacity of the waiting area according to the start-up loss time, the capacity of the waiting area and the timing information of traffic signals.

The types of holding areas mentioned include left-turn holding areas or straight-going holding areas;

The formula for calculating the start-up loss time of the left-turn waiting area is:

T _cl =0.93n _l +0.92

Among them, n _l is the capacity of the waiting area corresponding to the left-turn waiting area;

The formula for calculating the start-up loss time of the straight-going waiting area is:

T _cs =0.95ns _+1.32

Among them, n _s is the capacity of the waiting area corresponding to the straight waiting area.

The traffic signal timing information includes green light time and control cycle.

The formula for calculating the capacity of the waiting area is:

$\mathrm{<span\; class="notranslate">\; C</span>}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; G</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; S</span>}}}{\mathrm{<span\; class="notranslate">\; h</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; \&Center\; Dot;</span>\frac{\mathrm{<span\; class="notranslate">\; 3600</span>}}{\mathrm{<span\; class="notranslate">\; T</span>}}$

Among them, n is the capacity of the waiting area; T is the control period, in seconds; G is the green light time, in seconds; T _C is the start-up loss time, in seconds; T _S is the green or yellow light loss time, in seconds; h is the saturated headway, in seconds.

The formula for calculating the capacity of the waiting area is:

$\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; wait</span>}}}{{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; v</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}}}$

Among them, L _Wait is the length of the waiting area, L _v is the length of the standard vehicle, and L _C is the safety car-to-vehicle distance when parking, and the unit is meter;

When the calculation result of n is a decimal, the integer is rounded to the smallest.

Compared with the prior art, the present invention has the following advantages:

1. The traffic signal timing information at the intersection will affect the traffic capacity of the waiting area. The present invention takes this influencing factor into consideration, with comprehensive analysis and high calculation accuracy;

2. The present invention is convenient for calculation, and the user can directly use the present invention to calculate the corresponding traffic capacity;

3. By comparing the calculated value with the actual value through on-the-spot investigation, the average absolute error of the two is within the range of 3% to 10%, which shows that the method of the present invention has higher accuracy.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

detailed description

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

As shown in Figure 1, the method for obtaining the traffic capacity of the waiting area at a road intersection provided by the embodiment of the present invention includes the following steps:

1) Collect the type of waiting area at the intersection, the length of the waiting area, and the timing information of traffic signals. The timing information of traffic signals includes green light time and control cycle.

During the data collection, the influencing factors of the traffic capacity of various waiting areas were analyzed and studied, and the corresponding influencing factors and related mathematical regression methods were confirmed to prepare data for later analysis and research.

2) Calculate the corresponding capacity of the waiting area according to the length of the waiting area:

$\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; wait</span>}}}{{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; v</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

Among them, L _Wait is the length of the waiting area, L _v is the length of the standard vehicle, and L _C is the safety car-to-vehicle distance when parking, and the unit is meter; when the calculation result of n is a decimal, round to the smallest integer.

3) Calculate the corresponding start-up loss time according to the type of waiting area and the capacity of the waiting area. The types of waiting areas include left-turn waiting areas or straight-going waiting areas. The formula for calculating the start-up loss time of left-turn waiting areas is:

T _cl =0.93n _l +0.92 (2)

Among them, n _l is the capacity of the waiting area corresponding to the left-turn waiting area.

The formula for calculating the start-up lost time in the straight-going waiting area is:

T _cs =0.95ns _+1.32 (3)

Among them, n _s is the capacity of the waiting area corresponding to the straight waiting area.

4) Calculate the traffic capacity of the waiting area according to the start-up loss time, the capacity of the waiting area and the timing information of traffic signals. The calculation formula is:

$\mathrm{<span\; class="notranslate">\; C</span>}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; G</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; S</span>}}}{\mathrm{<span\; class="notranslate">\; h</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; \&Center\; Dot;</span>\frac{\mathrm{<span\; class="notranslate">\; 3600</span>}}{\mathrm{<span\; class="notranslate">\; T</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 4</span>}<span\; class="notranslate">\; )</span>$

Among them, n is the capacity of the waiting area; T is the control period, in seconds; G is the green light time, in seconds; T _C is the start-up loss time, in seconds; T _S is the green or yellow light loss time, in seconds; h is the saturated headway, in seconds.

Take the intersection of Henan North Road and Haining Road in Shanghai as an example. The specific steps are as follows.

The first step is to understand the type of intersection, the length of the waiting area, the type of the waiting area and the signal timing scheme through investigation. In this example, taking the innermost south entrance road at the intersection of Henan North Road and Haining Road in Shanghai as the target intersection, the capacity of the waiting area is calculated to be 4, the type of the waiting area is a left-turn waiting area, and it is a four-phase signal To control the intersection, the cycle time is 206 seconds, and the green light phase of the target entrance is 38 seconds;

In the second step, the start-up loss time of the entrance is obtained as 4.64 seconds through the formula for calculating the start-up loss time in the left-turn waiting area;

In the third step, with the help of the start-up loss time obtained in the second step, the calculation capacity of the entrance can be calculated as 308pcu/h by the calculation formula of the capacity of the waiting area. Compared with the actual result of 325pcu/h, it can be found that the present invention has better accuracy and reference value.

Claims (4)

1. A method for obtaining traffic capacity of a road intersection waiting area, characterized in that, comprising the following steps: 1) Collect information on the type of waiting area at the intersection, the length of the waiting area, and the timing of traffic signals; 2) Calculate the corresponding capacity of the waiting area according to the length of the waiting area; 3) Calculate the corresponding start-up loss time according to the type of waiting area and the capacity of the waiting area; 4) Calculate the traffic capacity of the waiting area according to the start-up loss time, the capacity of the waiting area and the timing information of traffic signals; The types of holding areas mentioned include left-turn holding areas or straight-going holding areas; The formula for calculating the start-up loss time of the left-turn waiting area is: T _cl =0.93n _l +0.92 Among them, n _l is the capacity of the waiting area corresponding to the left-turn waiting area; The formula for calculating the start-up loss time of the straight-going waiting area is: T _cs =0.95ns _+1.32 Among them, n _s is the capacity of the waiting area corresponding to the straight waiting area. 2. A method for obtaining traffic capacity of a waiting area at an intersection according to claim 1, wherein the traffic signal timing information includes green light time and control cycle. 3. A kind of method for obtaining the traffic capacity of the waiting area at a road intersection according to claim 2, characterized in that, the calculation formula of the traffic capacity of the waiting area is: $\mathrm{<span\; class="notranslate">\; C</span>}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; G</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; S</span>}}}{\mathrm{<span\; class="notranslate">\; h</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; \&CenterDot;</span>\frac{\mathrm{<span\; class="notranslate">\; 3600</span>}}{\mathrm{<span\; class="notranslate">\; T</span>}}$ Among them, n is the capacity of the waiting area; T is the control period, in seconds; G is the green light time, in seconds; T _C is the start-up loss time, in seconds; T _S is the green or yellow light loss time, in seconds; h is the saturated headway, in seconds. 4. A method for obtaining traffic capacity of a waiting area at a road intersection according to claim 1, 2 or 3, wherein the formula for calculating the capacity of the waiting area is: $\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; W</span>}\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; i</span>}\mathrm{<span\; class="notranslate">\; t</span>}}}{{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; v</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}}}$ Among them, L _Wait is the length of the waiting area, L _v is the length of the standard vehicle, and L _C is the safety car-to-vehicle distance when parking, and the unit is meter; When the calculation result of n is a decimal, the integer is rounded to the smallest.