CN105678034A - Pedestrian crossing time model and signalized intersection pedestrian crosswalk width optimizing method - Google Patents

Abstract

The invention discloses a pedestrian crossing time model, and belongs to the technical field of traffic engineering design.According to the pedestrian crossing time model, time delay generated in conflicts of opposite pedestrians in the pedestrian crossing process is considered, an existing pedestrian crossing time model is improved, opposite effect delay is added to the existing pedestrian crossing time model, and the model conforms to reality better.The invention further discloses a signalized intersection pedestrian crosswalk width optimizing method.According to the method, comfort for the pedestrians and the safety and high efficiency of the pedestrians and full utilization of space-time resources are comprehensively considered, the improved pedestrian crossing time model is combined, and the set width of a signalized intersection pedestrian crosswalk is reasonably optimized.On the one hand, comfort, efficiency and safety of pedestrian crossing are guaranteed, and meanwhile waste of the signalized intersection space-time resources is avoided; on the other hand, the problems of blindness, randomness and the like of traffic design personnel in the pedestrian crosswalk design process can be reduced.

Description

Pedestrians crossing time model and signalized intersections crossing width optimization method

Technical field

The present invention relates to traffic engineering design field, particularly relate to a kind of pedestrians crossing time model and signalized intersections crossing width optimization method.

Background technology

Along with green traffic, being rooted in the hearts of the people of low carbon traffic theory, pedestrian traffic is more and more subject to the attention of departments of government. But, under guiding based on the Development patterns of motor vehicle traffic, the many cities of China also exist that walking environment is poor, walking facility arranges the problems such as improper. One of important behave improving pedestrian traffic present situation is designed according to the principle of " people-oriented " by walking facility.

Signalized intersections is the important node of urban road network, is also the important carrier that pedestrian completed street traffic. In order to ensure the comfortable property of pedestrian's street crossing, security and high efficiency, crossing width Ying Yuguo street pedestrian's flow mates mutually. Hour can cause pedestrian's " spilling " on crossing when crossing width is crossed, increase pedestrian's street crossing and incur loss through delay and risk; Wide crossing can cause again the waste of crossing time-space distribution on the other hand, reduces the problems such as crossing operational efficiency.

But in the crossing width design of reality, owing to lacking rational scientific basis and practical method of design, width design often empirically judges. Existing " urban highway traffic facilities design specification " (GB50688-2011) relates to the regulation of crossing width design part also based on qualitative, and content is: pedestrian's lateral road width of trunk roads of postponing should not be less than 5m; The crossing width of other grade road of postponing should not be less than 3m, increases and decreases in units of 1m. It is therefore desirable to the method for calculation proposing a kind of quantification determine the crossing width value under each pedestrian's flow correspondence.

Summary of the invention

Technical problem to be solved by this invention is to overcome prior art deficiency, one pedestrians crossing time model more accurately is provided, and based on this model, a kind of signalized intersections crossing width optimization method is proposed, it is possible to science, determine different to cross under the pedestrian's flow of street reasonably crossing width quickly and easily.

The pedestrians crossing time model of the present invention, its expression formula is specific as follows:

In formula, T_tThe street time is spent for pedestrian is actual;T_sFor pedestrian start-up time; L is crossing length; W is crossing width; S_pFor pedestrian crossing speed; N_pedIt it is a signal period Nei Guo street pedestrian sum; N_ped1、N_ped2Represent respectively in the signal period, excessively street pedestrian a fairly large number of direction Shang Guo street pedestrian's number and reverse street pedestrian's number excessively; T_lRepresent and prolong hysteresis delay, refer to the delay that pedestrian forms a team in spreading process and produces; T_bRepresent that effect is incured loss through delay in opposite directions, refers to the delay that Pedestrian conflicts produces in opposite directions.

A kind of signalized intersections crossing width optimization method, comprises the following steps:

Step 1, the length gathering crossing to be optimized, original width and pedestrian's statistic data, and determine that crossing two ends waited that the setting pedestrian in street formed a team scale according to pedestrian's statistic data;

Step 2, determine crossing width candidate's threshold value, specifically comprise:

(1) crossing width first upper limit threshold W is determined₁, concrete grammar is as follows:

Pedestrians crossing time model described in above technical scheme being carried out differential, obtains the quantitative relationship between unit crossing width increment and corresponding pedestrians crossing time reduction, concrete formula is as follows:

In the scope of 1s/m～4s/m it isChoose the value determined and substitute into upper formula, and crossing two ends determined in step 1 were waited the setting pedestrian in street form a team in scale numerical value more greatly, less setting pedestrian form a team scale as N_ped1、N_ped2Formula in substitution, the W calculated is as crossing width first upper limit threshold W₁;

(2) crossing width first lower threshold W is determined₂, concrete grammar is as follows:

Crossing two ends determined in step 1 were waited, and the setting pedestrian in street forms a team in scale numerical value more greatly, relatively

Little setting pedestrian forms a team scale respectively as N_ped1、N_ped2Substituting into pedestrians crossing time model described in above technical scheme, calculating pedestrian now is actual spends street time T_t, prolong hysteresis delay T_l, in opposite directions effect incur loss through delay T_bAnd the relational expression between crossing width W, and calculate the value of crossing width W when incuring loss through delay the maximum acceptable delay accounting of the accounting pedestrian's street crossing that just equals default, this crossing width value is crossing width first lower threshold W₂, the expression formula incuring loss through delay accounting PDC is as follows:

(3) crossing width the 2nd upper limit threshold W is determined₃, concrete grammar is as follows:

The pedestrian local density determined on crossing equals crossing width during default pedestrian local density threshold value

Angle value, and using this crossing width value as crossing width the 2nd upper limit threshold W₃;

(4) crossing width the 2nd lower threshold W is determined₄, concrete grammar is as follows:

Pedestrian's street crossing sight under the different crossing width of simulation, and get crossing width value when pedestrian stream choking phenomenon is eliminated just as crossing width the 2nd lower threshold W₄;

Step 3, determine crossing width upper and lower limit threshold value W according to following formula_max、W_min, and for crossing to be optimized selects a value as the crossing width after optimization between determined upper and lower limit threshold value:

Preferably, described determine that crossing two ends waited that the setting pedestrian in street formed a team scale according to pedestrian's statistic data, concrete grammar is as follows: in multiple red signal cycles of statistics peak period, crossing two ends to be optimized waited that the pedestrian in street formed a team scale data sequence, and scale data sequence of two pedestrians obtained being formed a team is got 85% fractile respectively and waited that the setting pedestrian in street formed a team scale as crossing two ends.

Preferably, the value of the delay accounting that described pedestrian's street crossing is maximum acceptable is 30%.

Preferably, the calculation formula of described pedestrian local density is specific as follows:

Wherein,Being represent on crossing certain any position coordinate, t represents and calculates the moment,Represent that moment t is in positionOn local pedestrian density,Represent that pedestrian i is (x in the position of t_i,y_i), R be weigh be the center of circle with (x, y), area be A=π R²Border circular areas in the weight parameter of pedestrian; Wherein the value of weight parameter R is preferably 0.7m.

Preferably, the pedestrian's street crossing sight under utilizing cellular automata pedestrian simulation model to simulate different crossing width.

Preferably, pedestrian's statistic data of crossing to be optimized is gathered by the mode of video capture or manual research.

Compared to existing technology, the present invention has following useful effect:

1) the present invention can in the waste avoiding signalized intersections time-space distribution ensureing the comfortable property of pedestrian's street crossing, efficiency and security simultaneously;

2) the present invention can reduce traffic engineering teacher in problems such as the blindness designed in crossing process, randomness.

Accompanying drawing explanation

Fig. 1 is the schematic flow sheet of signalized intersections crossing width optimization method of the present invention;

Fig. 2 is crossing schematic diagram;

Fig. 3 is the pedestrian local density emulation result under different crossing width.

Embodiment

Below in conjunction with accompanying drawing, the technical scheme of the present invention is described in detail:

Crossing width carried out reasonably optimizing, to be unable to do without pedestrians crossing time model accurately. current existing pedestrians crossing time model comprises: pedestrians crossing time computation model [TransportationResearchBoard.HighwayCapacityManual [M] .TransportationResearchBoardoftheNationalAcademies in HCM, Washington, D.C., 2010.], Alhajyaseen utilizes wave theory and the pedestrians crossing time computation model [AlhajyaseenW of Hydrodynamics Theory foundation, NakamuraH.Estimatingtheminimumrequiredwidthofsignalizedc rosswalksconsideringbi-directionalpedestrianflowanddiffe rentagegroups [J] .JournalofAsiaTransportStudies (ATS), 2010, 1 (2): 138-155.] and [Xu Liangjie such as Xu Liangjie and Wang Wei, Wang Wei. signalized intersections pedestrians crossing time model [J]. Communication and Transportation Engineering journal, 2005, 5 (1): 111-115.] theoretical according to traffic conflict and can crossing gap theoretical, the signalized intersections pedestrians crossing time model etc. by right turning vehicle interference set up, wherein, document [GolaniA, DamtiH.ModelforEstimatingCrossingTimesatHigh-OccupancyCr osswalks. [J] .TransportationResearchRecord:JournaloftheTransportation ResearchBoard, 2007,2002:125 130.] disclosed in pedestrians crossing time model, its expression formula is as follows:

In formula, T_tThe street time is spent for pedestrian is actual; I is pedestrian start-up time; L is crossing length; W is crossing width; S_pFor pedestrian crossing speed; N_pedIt it is a signal period Nei Guo street pedestrian sum; N_ped1、N_ped2Represent respectively in the signal period, excessively street pedestrian a fairly large number of direction Shang Guo street pedestrian's number and reverse street pedestrian's number excessively.

What the pedestrians crossing time model of AnaisGolani and HarelDamti considered pedestrian prolongs hysteresis delay, and constructs this delay and the relation of crossing width. Pedestrians crossing time is when unit width pedestrian's quantity is less than or equal to 5, and the model of AnaisGolani and HarelDamti can coincide well;And when unit width pedestrian's quantity is greater than 5, both also exist certain deviation. The reason causing this deviation is that AnaisGolani and HarelDamti does not recognize that in modeling process the effect in opposite directions of pedestrian stream is incured loss through delay; They do not set up relation between effect delay and crossing width in opposite directions yet simultaneously, but show this delay by constant term.

In order to overcome the problems referred to above, this pedestrians crossing time model has been improved by the present invention, adds effect in opposite directions wherein and incurs loss through delay, and the so-called delay of effect in opposite directions refers to the delay that Pedestrian conflicts produces in opposite directions, and the pedestrians crossing time model after improvement is specific as follows:

In formula, T_tThe street time is spent for pedestrian is actual; T_sFor pedestrian start-up time; L is crossing length; W is crossing width; S_pFor pedestrian crossing speed; N_pedIt it is a signal period Nei Guo street pedestrian sum; N_ped1、N_ped2Represent respectively in the signal period, excessively street pedestrian a fairly large number of direction Shang Guo street pedestrian's number and reverse street pedestrian's number excessively; T_lRepresent and prolong hysteresis delay, refer to the delay that pedestrian forms a team in spreading process and produces; T_bRepresent that effect is incured loss through delay in opposite directions, refers to the delay that Pedestrian conflicts produces in opposite directions.

Based on the improvement pedestrians crossing time model of formula (1), present invention further proposes a kind of signalized intersections crossing width optimization method, as shown in Figure 1, the method comprises the following steps:

Step 1, the length gathering crossing to be optimized, original width and pedestrian's statistic data, and determine that crossing two ends waited that the setting pedestrian in street formed a team scale according to pedestrian's statistic data.

The object of this step is traffic environmental data during acquisition and recording pedestrian's street crossing and pedestrian's data, traffic environmental data mainly comprises the length L (m) of the crossing to be optimized and original width W (m) of crossing, and pedestrian's statistic data of crossing to be optimized gathers by the mode such as video capture or manual research. Described determine that crossing two ends waited that the setting pedestrian in street formed a team scale according to pedestrian's statistic data, can determine according to actual needs, such as, crossing two ends to be optimized in multiple red signal cycle can be added up respectively in peak period and wait that the pedestrian in street formed a team scale (namely waiting the number in street), then directly get maximum value or mean value and waited that the setting in street was formed a team scale as crossing two ends; The present invention preferably adopts following method: in multiple red signal cycles of statistics peak period, crossing two ends to be optimized waited that the pedestrian in street formed a team scale data sequence, and scale data sequence of two pedestrians obtained being formed a team is got 85% fractile respectively and waited that the setting pedestrian in street formed a team scale as crossing two ends. Certainly the value of fractile can also be adjusted according to practical situation, such as desirable 70%, 80% or 90% etc.

Step 2, determine crossing width candidate's threshold value, specifically comprise:

(1) crossing width first upper limit threshold W is determined₁:

Pedestrians crossing time model shown in formula (1) is carried out differential and can obtain the quantitative relationship between unit crossing width increment and corresponding pedestrians crossing time reduction, as shown in formula (2):

Crossing two ends determined in step 1 were waited the setting pedestrian in street form a team in scale numerical value more greatly, less setting pedestrian form a team scale as N_ped1、N_ped2Substitute into formula (2), and it isChoose a suitable threshold value, now can calculate a corresponding crossing width W, it can be used as crossing width first upper limit threshold W₁.According to practical experience, above-mentioned threshold value arranges scope and generally gets 1s/m～4s/m. Bottom threshold gets 1s/m, because when width increases 1m, when pedestrians crossing time reduction is less than 1s, continues to increase crossing width and there is no too big meaning. In concrete practice, this threshold value can be determined according to actual crossing crossing available space size: when crossing limited space, unit width pedestrians crossing time reduction is desirable larger, and when crossing installation space is relatively more than needed, this threshold value can corresponding be got smaller.

(2) crossing width first lower threshold W is determined₂:

Crossing two ends determined in step 1 were waited, and the setting pedestrian in street forms a team in scale numerical value more greatly, relatively

Little setting pedestrian forms a team scale respectively as N_ped1、N_ped2Substitute into pedestrians crossing time model shown in formula (1), actual street time T excessively of pedestrian now can be obtained_t, prolong hysteresis delay T_l, in opposite directions effect incur loss through delay T_bAnd the relational expression between crossing width W, wherein, prolongs hysteresis delay T_lReferring to the delay that pedestrian forms a team in spreading process and produces, effect incurs loss through delay T in opposite directions_bRefer to the delay that Pedestrian conflicts produces in opposite directions.

Calculate and incur loss through delay accounting PDC: incuring loss through delay accounting is prolong hysteresis delay to incur loss through delay the ratio accounting for the actual mistake street time with effect in opposite directions, and its calculation formula is as shown in formula (3):

Finally calculating the value of crossing width W when incuring loss through delay the maximum acceptable delay accounting of the accounting pedestrian's street crossing that just equals default, this crossing width value is crossing width first lower threshold W₂. Finding through a large amount of factual survey, the delay accounting that pedestrian's street crossing is maximum acceptable under normal circumstances is 30%, and therefore the present invention preferably adopts this value.

(3) crossing width the 2nd upper limit threshold W is determined₃:

Pedestrian local density is the pedestrian's distribution situation representing that the some time is engraved on a certain position of crossing, and pedestrian local density calculation formula is as shown in formula (4), (5):

Wherein,Being represent on crossing certain any position coordinate, t represents and calculates the moment,Represent that moment t is in positionOn local pedestrian density,Represent that pedestrian i is (x in the position of t_i,y_i), R be weigh be the center of circle with (x, y), area be A=π R²Border circular areas in the weight parameter of pedestrian; Wherein the value of weight parameter R is preferably 0.7m.

According to formula (4), (5), crossing width value when pedestrian local density equals predetermined threshold value can be calculated, and using this crossing width value as crossing width the 2nd upper limit threshold W₃. in this embodiment, definition according to pedestrian local density, at cellular automata pedestrian simulation model, (this is prior art, specifically can see document [RenGang, LuLili*, WangWei, GongXiaolin, HangZhenfengMicroscopicsimulationmodelforpedestrianflowa tsignalizedcrosswalks.TransportationResearchRecord:Journ alofTransportationResearchBoard.]) the middle computational algorithm embedding above-mentioned local density, the parameter value of input data record unit, Dynamic simulation model can pedestrian local density level value on crossing. pedestrian's street crossing sight under the different crossing width of simulation, when crossing width value be increased to gradually make pedestrian local density value be reduced to gradually certain preset service level (corresponding relation between each grade of service and pedestrian local density is see table 1, the present embodiment is chosen A service level, namely pedestrian local density equals 0.9) under local density's value time, get crossing width value W now₃As the 2nd higher limit of crossing width.

Table 1: each grade service level Xia Guo street pedestrian local density

(4) crossing width the 2nd lower threshold W is determined₄:

Under the prerequisite not allowing pedestrian to overflow crossing, the generation of pedestrian stream choking phenomenon during crossing short of width, can be caused, it is thus desirable to the lower value of crossing width is determined in the stagnation point occurred according to pedestrian stream choking phenomenon. Existing all kinds of pedestrian simulation model can be utilized herein, by the stream of people's situation under the different crossing width of simulation emulation, and get crossing width value when pedestrian stream choking phenomenon is eliminated just as crossing width the 2nd lower threshold W₄. For convenience, the present embodiment directly uses definite threshold W₃Time the cellular automata pedestrian simulation model that embedded in pedestrian local density algorithm that uses simulate the pedestrian's street crossing sight under different crossing width.

Step 3, determine optimize after crossing width:

According to two upper limit threshold W that step 2 obtains₁、W₃And two lower threshold W₂、W₄, the upper and lower limit W of crossing reasonable wide value can be obtained according to following formula_max、W_min:

$\begin{array}{c}{W}_{\min }=max\{W_2,W_4\}\\ W_{\max }=\min \{W_1,W_3\}\end{array}---\left(6\right)$

Finally, according to practical situation at W_max、W_minBetween get a value determined as the crossing width after optimizing, and crossing width is arranged again.

In order to verify effect of the present invention, carry out following experiment:

The inventive method is utilized to be optimized by the crossing width shown in Fig. 2. In Fig. 2, black circles represents the pedestrian waiting street, and arrow represents pedestrian advancing direction. Realize the blank region representation crossing surrounded by black, solid black lines represents crossing border, and L represents crossing length, and W represents crossing width, and unit is rice.

First crossing data are obtained, the long 32m of crossing, wide 4.8m with artificial method of masurement; Obtain signal period Nei Guo street pedestrian amount by videograph means, obtain N_ped1=N_ped2=25.

Data are substituted into formula (2), obtains crossing width first higher limit W₁=10.0m.

Data are substituted into formula (1), (3), calculates first lower value W₂=4.8m.

Running the pedestrian's cellular automata realistic model embedding pedestrian local density algorithm, pedestrian's street crossing motion conditions when simulation crossing width changes to 11m from 2m, emulation result is as shown in Figure 3. Obtaining the crossing service level grade when crossing width is 11m according to table 1 is A level. Thus obtain crossing width the 2nd higher limit W₃=11.0m. Emulation simultaneously obtains pedestrian stream when crossing width is 2.8m and choking phenomenon does not occur in operational process, thus obtains crossing width the 2nd lower value W₄=2.8m.

The rational width scope finally obtaining this place's crossing according to formula (6) is 4.8m～10.0m.

In summary, the present invention has considered making full use of of the comfortable property of pedestrian, security, high efficiency and time-space distribution, in conjunction with the pedestrians crossing time model improved, the width that arranges of signalized intersections crossing is carried out reasonably optimizing, ensure the waste simultaneously avoiding signalized intersections time-space distribution of the comfortable property of pedestrian's street crossing, efficiency and security on the one hand, traffic design personnel can have been reduced on the other hand in problems such as the blindness designed in crossing process, randomness. Therefore, the present invention has good application prospect.

Claims (10)

1. a pedestrians crossing time model, it is characterised in that, its expression formula is specific as follows:

In formula, T_tThe street time is spent for pedestrian is actual;T_sFor pedestrian start-up time; L is crossing length; W is crossing width; S_pFor pedestrian crossing speed; N_pedIt it is a signal period Nei Guo street pedestrian sum; N_ped1、N_ped2Represent respectively in the signal period, excessively street pedestrian a fairly large number of direction Shang Guo street pedestrian's number and reverse street pedestrian's number excessively; T_lRepresent and prolong hysteresis delay, refer to the delay that pedestrian forms a team in spreading process and produces; T_bRepresent that effect is incured loss through delay in opposite directions, refers to the delay that Pedestrian conflicts produces in opposite directions.

2. a signalized intersections crossing width optimization method, it is characterised in that, comprise the following steps:

Step 1, the length gathering crossing to be optimized, original width and pedestrian's statistic data, and determine that crossing two ends waited that the setting pedestrian in street formed a team scale according to pedestrian's statistic data;

Step 2, determine crossing width candidate's threshold value, specifically comprise:

(1) crossing width first upper limit threshold W is determined₁, concrete grammar is as follows:

Pedestrians crossing time model described in claim 1 being carried out differential, obtains the quantitative relationship between unit crossing width increment and corresponding pedestrians crossing time reduction, concrete formula is as follows:

$\left\{\begin{array}{cc}\frac{{\mathrm{dT}}_t}{dW}=2.09*\frac{-N_{ped1}}{W^2}+0.52*\frac{-N_{ped2}}{W^2}& \frac{N_{ped}}{W}\≤5ped/m\\ \frac{{\mathrm{dT}}_t}{dW}=1.41*\frac{-N_{ped1}}{W^2}+0.73*\frac{-N_{ped2}}{W^2}& \frac{N_{ped}}{W}>5ped/m\end{array}\right.$

In the scope of 1s/m～4s/m it isChoose the value determined and substitute into upper formula, and crossing two ends determined in step 1 were waited the setting pedestrian in street form a team in scale numerical value more greatly, less setting pedestrian form a team scale as N_ped1、N_ped2Formula in substitution, the W calculated is as crossing width first upper limit threshold W₁;

(2) crossing width first lower threshold W is determined₂, concrete grammar is as follows:

Crossing two ends determined in step 1 were waited, and the setting pedestrian in street forms a team in scale numerical value more greatly, relatively

Little setting pedestrian forms a team scale respectively as N_ped1、N_ped2Substituting into pedestrians crossing time model described in claim 1, calculating pedestrian now is actual spends street time T_t, prolong hysteresis delay T_l, in opposite directions effect incur loss through delay T_bAnd the relational expression between crossing width W, and calculate the value of crossing width W when incuring loss through delay the maximum acceptable delay accounting of the accounting pedestrian's street crossing that just equals default, this crossing width value is crossing width first lower threshold W₂, the expression formula incuring loss through delay accounting PDC is as follows:

$PDC=\frac{T_t+T_b}{T_t};$

(3) crossing width the 2nd upper limit threshold W is determined₃, concrete grammar is as follows:

The pedestrian local density determined on crossing equals crossing width value during default pedestrian local density threshold value, and using this crossing width value as crossing width the 2nd upper limit threshold W₃;

(4) crossing width the 2nd lower threshold W is determined₄, concrete grammar is as follows:

Pedestrian's street crossing sight under the different crossing width of simulation, and get crossing width value when pedestrian stream choking phenomenon is eliminated just as crossing width the 2nd lower threshold W₄;

Step 3, determine crossing width upper and lower limit threshold value W according to following formula_max、W_min, and for crossing to be optimized selects a value as the crossing width after optimization between determined upper and lower limit threshold value:

W_min=max{W₂,W₄}

W_max=min{W₁,W₃}。

3. signalized intersections crossing width optimization method as claimed in claim 2, it is characterized in that, described determine that crossing two ends waited that the setting pedestrian in street formed a team scale according to pedestrian's statistic data, concrete grammar is as follows: in multiple red signal cycles of statistics peak period, crossing two ends to be optimized waited that the pedestrian in street formed a team scale data sequence, and scale data sequence of two pedestrians obtained being formed a team is got 85% fractile respectively and waited that the setting pedestrian in street formed a team scale as crossing two ends.

4. signalized intersections crossing width optimization method as claimed in claim 2, it is characterised in that, the value of the delay accounting that described pedestrian's street crossing is maximum acceptable is 30%.

5. signalized intersections crossing width optimization method as claimed in claim 2, it is characterised in that, the calculation formula of described pedestrian local density is specific as follows:

$\mathrm{\ρ}(\stackrel{\→}{r},t)=\underset{i}{\mathrm{\Σ}}f(\stackrel{\→}{r_i\left(t\right)}-\stackrel{\→}{r})$

$f(\stackrel{\→}{r_i\left(t\right)}-\stackrel{\→}{r})=\frac{1}{\mathrm{\π}{R}^2}\exp [-{\left|\right|\stackrel{\→}{r_i}\left(t\right)-\stackrel{\→}{r|}\left|\right|}^2/R^2]$

Wherein,Being represent on crossing certain any position coordinate, t represents and calculates the moment,Represent that moment t is in positionOn local pedestrian density,Represent that pedestrian i is (x in the position of t_i,y_i), R be weigh be the center of circle with (x, y), area be A=π R²Border circular areas in the weight parameter of pedestrian.

6. signalized intersections crossing width optimization method as claimed in claim 5, it is characterized in that, it may also be useful to the crossing width value when cellular automata pedestrian simulation model embedding described pedestrian local density calculation formula equals default pedestrian local density threshold value to the pedestrian local density determining on crossing.

7. signalized intersections crossing width optimization method as claimed in claim 5, it is characterised in that, the value of described pedestrian local density threshold value is 0.9.

8. signalized intersections crossing width optimization method as claimed in claim 5, it is characterised in that, the value of weight parameter R is 0.7m.

9. signalized intersections crossing width optimization method as claimed in claim 2, it is characterised in that, the pedestrian's street crossing sight under utilizing cellular automata pedestrian simulation model to simulate different crossing width.

10. signalized intersections crossing width optimization method as claimed in claim 2, it is characterised in that, pedestrian's statistic data of crossing to be optimized is gathered by the mode of video capture or manual research.