CN104282148A - Method for obtaining traffic capacity of road intersection vehicle-waiting area - Google Patents

Abstract

The invention relates to a method for obtaining the traffic capacity of a road intersection vehicle-waiting area. The method comprises the steps that (1) the type of the road intersection vehicle-waiting area, the length of the vehicle-waiting area and traffic signal timing information are collected; (2) the corresponding capacity of the vehicle-waiting area is calculated according to the length of the vehicle-waiting area; (3) the corresponding start loss time is calculated according to the type and capacity of the vehicle-waiting area; (4) the traffic capacity of the vehicle-waiting area is calculated according to the start loss time, the capacity of the vehicle-waiting area and the traffic signal timing information. Compared with the prior art, the method has the advantages that calculation is convenient, and accuracy is high.

Description

A kind of method obtaining the intersection Dai Hang district traffic capacity

Technical field

The present invention relates to field of traffic control, especially relate to a kind of method obtaining the intersection Dai Hang district traffic capacity.

Background technology

Nowadays, most of crossing is all provided with Dai Hang district, and more Dai Hang district purposes discharges inner space, crossing increase entrance driveway capacity under not affecting traffic conditions, to alleviate lower traffic pressure, and raising traffic efficiency.Also many similar research and discoveries relevant to the Dai Hang district traffic capacity are had though domestic, but not yet there is the unified traffic capacity for domestic communication feature to calculate standard, traffic design with evaluate, this just to increase result of calculation and the inconsistent degree of actual conditions unavoidably.

Therefore, a set of special for Dai Hang district traffic capacity computing method for traffic design, evaluation, planning, manage urban road better, promote urban development, have certain positive effect and effect.

Summary of the invention

Object of the present invention is exactly the method in order to overcome defect that above-mentioned prior art exists and the acquisition intersection Dai Hang district traffic capacity that provides a kind of degree of accuracy high.

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

Obtain a method for 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 Dai Hang district type and startup lost time corresponding to Dai Hang district calculation of capacity;

4) the Dai Hang district traffic capacity is calculated according to starting lost time, Dai Hang district capacity and Traffic Signal Timing information.

Described Dai Hang district type comprises left-hand rotation Dai Hang district or craspedodrome Dai Hang district;

Startup computing formula lost time in described left-hand rotation Dai Hang district is:

T _cl＝0.93n _l+0.92

Wherein, n _lfor the Dai Hang district capacity that left-hand rotation Dai Hang district is corresponding;

Startup computing formula lost time in described craspedodrome Dai Hang district is:

T _cs＝0.95n _s+1.32

Wherein, n _sfor the Dai Hang district capacity that craspedodrome Dai Hang district is corresponding.

Described Traffic Signal Timing information comprises green time and control cycle.

The computing formula of the described Dai Hang district traffic capacity is:

$C=(n+\frac{G-T_C-T_S}{h})\·\frac{3600}{T}$

Wherein, n is Dai Hang district capacity; T is control cycle, unit second; G is green time, unit second; T _cfor starting lost time, unit second; T _sfor green end or amber light lost time, unit second; H is saturation headway, unit second.

The computing formula of described Dai Hang district capacity is:

$n=\frac{L_{\mathrm{Wait}}}{L_v+L_C}$

Wherein, L _waitfor treating row section length, L _vfor standard vehicle length, L _caccident-free vehicle following distance during for stopping, unit is rice;

When the result of calculation of n is decimal, to little round numbers.

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

1, the Traffic Signal Timing information of crossing can affect the traffic capacity in Dai Hang district, contemplated by the invention this influence factor, and analyze comprehensively, counting accuracy is high;

2, convenience of calculation of the present invention, user direct the present invention can calculate the corresponding traffic capacity;

3, by on-site inspection, comparing calculation value and actual value, the two mean absolute error, in 3% ~ 10% scope, illustrates that the inventive method has higher accuracy.

Accompanying drawing explanation

Fig. 1 is structural representation of the present invention.

Embodiment

Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.The present embodiment is implemented premised on technical solution of the present invention, give detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.

As shown in Figure 1, the method for the acquisition intersection Dai Hang district traffic capacity that the embodiment of the present invention provides comprises the following steps:

1) gather crossing's Dai Hang district type, treat row section length and Traffic Signal Timing information, Traffic Signal Timing information comprises green time and control cycle etc.

When carrying out data acquisition, the influence factor of all kinds of Dai Hang districts traffic capacity of having analyzed and researched, confirms corresponding factor of influence and relevant mathematics homing method, for data encasement is done in post analysis research.

2) according to treating that row section length calculates corresponding Dai Hang district capacity:

$n=\frac{L_{\mathrm{Wait}}}{L_v+L_C}---\left(1\right)$

Wherein, L _waitfor treating row section length, L _vfor standard vehicle length, L _caccident-free vehicle following distance during for stopping, unit is rice; When the result of calculation of n is decimal, to little round numbers.

3) according to Dai Hang district type and startup lost time corresponding to Dai Hang district calculation of capacity.Dai Hang district type comprises left-hand rotation Dai Hang district or craspedodrome Dai Hang district, and wherein, startup computing formula lost time in left-hand rotation Dai Hang district is:

T _cl＝0.93n _l+0.92 (2)

Wherein, n _lfor the Dai Hang district capacity that left-hand rotation Dai Hang district is corresponding.

Startup computing formula lost time in craspedodrome Dai Hang district is:

T _cs＝0.95n _s+1.32 (3)

Wherein, n _sfor the Dai Hang district capacity that craspedodrome Dai Hang district is corresponding.

4) calculate the Dai Hang district traffic capacity according to starting lost time, Dai Hang district capacity and Traffic Signal Timing information, computing formula is:

$C=(n+\frac{G-T_C-T_S}{h})\·\frac{3600}{T}---\left(4\right)$

Wherein, n is Dai Hang district capacity; T is control cycle, unit second; G is green time, unit second; T _cfor starting lost time, unit second; T _sfor green end or amber light lost time, unit second; H is saturation headway, unit second.

Be described for crossing, Haining road, North Road, Henan, Shanghai City, the concrete step that uses is with reference to as follows.

The first step, by inquiry, understands the type of crossing, treats row section length, Dai Hang district type and signal time distributing conception.In this example, using crossing, Haining road, North Road, Henan, Shanghai City, southing stomatodeum in inner side, as target crossing, is 4 by calculating its Dai Hang district capacity, Dai Hang district type is left-hand rotation Dai Hang district, be that four phase signals control crossing, cycle length is 206 seconds, and target inlet road green light phase place is 38 seconds;

Second step, starting by left-hand rotation Dai Hang district startup lost time that lost time, value formula obtained this entrance driveway is 4.64 seconds;

3rd step, by means of the startup lost time that second step is tried to achieve, can calculate the calculating traffic capacity of this entrance driveway is 308pcu/h by Dai Hang district traffic capacity computing formula.Contrast actual result 325pcu/h, can find that the present invention has good accuracy and reference value.

Claims (5)

1. obtain a method for the intersection Dai Hang district traffic capacity, it is characterized in that, 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 Dai Hang district type and startup lost time corresponding to Dai Hang district calculation of capacity;

4) the Dai Hang district traffic capacity is calculated according to starting lost time, Dai Hang district capacity and Traffic Signal Timing information.

2. a kind of method obtaining the intersection Dai Hang district traffic capacity according to claim 1, is characterized in that, described Dai Hang district type comprises left-hand rotation Dai Hang district or craspedodrome Dai Hang district;

Startup computing formula lost time in described left-hand rotation Dai Hang district is:

T _cl＝0.93n _l+0.92

Wherein, n _lfor the Dai Hang district capacity that left-hand rotation Dai Hang district is corresponding;

Startup computing formula lost time in described craspedodrome Dai Hang district is:

T _cs＝0.95n _s+1.32

Wherein, n _sfor the Dai Hang district capacity that craspedodrome Dai Hang district is corresponding.

3. a kind of method obtaining the intersection Dai Hang district traffic capacity according to claim 1, it is characterized in that, described Traffic Signal Timing information comprises green time and control cycle.

4. a kind of method obtaining the intersection Dai Hang district traffic capacity according to claim 3, is characterized in that, the computing formula of the described Dai Hang district traffic capacity is:

$C=(n+\frac{G-T_C-T_S}{h})\·\frac{3600}{T}$

Wherein, n is Dai Hang district capacity; T is control cycle, unit second; G is green time, unit second; T _cfor starting lost time, unit second; T _sfor green end or amber light lost time, unit second; H is saturation headway, unit second.

5. a kind of method obtaining the intersection Dai Hang district traffic capacity according to claim 1 or 2 or 4, is characterized in that, the computing formula of described Dai Hang district capacity is:

$n=\frac{L_{\mathrm{Wait}}}{L_v+L_C}$

Wherein, L _waitfor treating row section length, L _vfor standard vehicle length, L _caccident-free vehicle following distance during for stopping, unit is rice;

When the result of calculation of n is decimal, to little round numbers.