CN105023434B - Method for obtaining congestion index of motorway - Google Patents
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- CN105023434B CN105023434B CN201510388551.4A CN201510388551A CN105023434B CN 105023434 B CN105023434 B CN 105023434B CN 201510388551 A CN201510388551 A CN 201510388551A CN 105023434 B CN105023434 B CN 105023434B
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Abstract
The invention discloses a method for obtaining the congestion index of a motorway, and the method comprises the steps: calculating a traffic condition parameter through definition, wherein the traffic condition parameter serves as a congestion index of the condition of atom road segments; calculating and obtaining the congestion index of a road through the calculation of the dynamic road section importance of all atom road segments; and obtaining the congestion index of the whole road network through calculating the dynamic road segment importance of all roads in a road network. The road condition parameter is approximately equal to the traffic flow density. The traffic flow density is obtained through the ratio of a road segment inventory to the product of a road segment length and a lane number. The inventory is obtained through the back calculation of the average speed of the traffic flow. The method is direct and simple in calculation, can quantify the road condition and depict the congestion in a systematic and layered manner, reflects the operation condition of a motorway network, can provide decision-making support for a traffic manager, provides reference for the travel of persons, alleviates or reduces the congestion of the motorway, and saves the social cost.
Description
Technical field
The present invention relates to highway congestion index computational methods, and in particular to a kind of to be based on slip-road charge data
Layering congestion index modeling and congestion index acquisition methods.
Background technology
At present, the freeway network of China realizes provincial networked fee collection substantially, with common expressway tol lcollection
As a example by system, its basic function mode is exactly that vehicle writes card into hair fastener during freeway network system, and vehicle rolls away from public at a high speed
Card Reader charge during the road network system of road；Although the Major Systems target of Fare Collection System is networked fee collection, substantial amounts of friendship daily
The through-flow charge record initial data that can produce magnanimity, and abundant attribute information is included in these charge records, such as
Into/time of End of motorway net, vehicle, entrance/roll website, car plate of highway etc. away from.By to these information
Statistical analysiss, application data excavate correlation technique and knowledge, we are not difficult to obtain more traffic parameter features, such as each
The flow information of atom section and website, source vehicle analysis, vehicle component analyses, or even further these traffic parameters are entered
Row prediction and estimation.
So-called recoverable amount, that is, refer to that some time carves t, and the equivalent vehicle number of all travelings on current road segment, road or road network is single
Position is a minibus.So-called congestion index, refers to by rationally setting up model, defeated as model using specific traffic parameter
Enter, the exponential quantity that final output one specifically quantifies, for portraying congestion level.
Highway office of the United States Federal is in the urban road congestion assessment report that nineteen ninety is issued, it is proposed that congestion in road
The concept of index, its Formal Representation are as follows：
Wherein, Freeway is the daily VMT Vehicle-Miles of Travel in through street；FreewayVMT/Ln.-Mi is that through street is every daily
The VMT Vehicle-Miles of Travel of track kilometer；PrinArt Str VMT are the daily VMT Vehicle-Miles of Travel of trunk roads；Prin Artt
RVMT/Ln.-Mi is the daily VMT Vehicle-Miles of Travel per track kilometer of trunk roads.
The index considers average daily VMT Vehicle-Miles of Travel (the vehicle miles of two class roads (through street and major trunk roads)
Traveled), and with threshold value standardization has been carried out.The problem that congestion in road index is present is calculated by the model is：Average daily car
Distance travelled is an indirectly traffic parameter, under the conditions of current country's highway data collecting system, it is difficult to obtain.
Dezhou shipping office is proposed using highway performance detection system in the annual Urban Mobility report of 1993
The data of system (Highway Performance Monitoring System, HPMS) calculate congestion severity index CSI, should
Index is used for the jam level for assessing 37 large size cities in U.S. region；Its formalization representation is as follows：
Wherein, Total Freeway Delay (veh.hrs) are the daily total time delays of highway, i.e., public at a high speed
On road, the delay time at stop of each driving vehicle adds up, and unit is a hour；Freeway VMT (million) are public at a high speed
The daily VMT Vehicle-Miles of Travel in road, the summation of all VMT Vehicle-Miles of Travels in as specific road network, unit are a kilometer.
The problem that the index is present is：Urban traffic blocking section is directed to, and only focuses on the section of local, it is impossible to be
Evaluate the congestion level of whole traffic system in system ground.
Dezhou shipping office also proposed a kind of hourage index TTI in annual Urban Mobility report later, be
With peak period hourage (Peak period travel time) with freely flow down hourage (free flow travel
Time ratio) portrays congestion, and its formalization representation is as follows：
In addition to existing with above-mentioned CSI identicals shortcoming, the acquisition of hourage is substantially base to hourage index TTI
Obtain in the loop data or a small amount of floating car data of limited section, the space-time representativeness of these data is poor, thus adopts
With the congestion level of the exponential representation traffic system, its accuracy does not simultaneously know.
The content of the invention
In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a kind of acquisition methods of highway congestion index,
The method imports and exports charge data based on freeway net, with reference to its data edge and feature, builds a kind of congestion of layering and refers to
Exponential model, for quantifying road conditions and portraying congestion.
The present invention principle be：By traffic parameter inverting being carried out to charge data, obtain basic road conditions parameter, and then structure
Build layering congestion index model.Specifically, in atom section aspect, it is proposed that road conditions parameter is used as portraying its road conditions and congestion
The basic parameter of situation, so-called road conditions parameter are referred in unit in empty window, hourage of all vehicles for passing through it
With.With reference to knowledge in field after deducing, it can be found that road conditions parameter is approximately equal to vehicle density in fact；And be based at a high speed
Highway imports and exports charge data, and we obtain possessing for a certain instantaneous section by average speed of traffic flow Inversion Calculation (Fig. 2)
Amount；Vehicle density can be worth to by the ratio of recoverable amount and road section length and track quantity, used as the road conditions parameter in atom section；
The road conditions parameter in atom section as characterizes the congestion index of atom section road conditions.On this basis, it is each in road by calculating
The dynamic section importance in atom section, then it is calculated congestion in road index；By the dynamic for calculating each bar road in road network
Section importance, then it is calculated the congestion index of system-wide net.
The present invention provide technical scheme be：
A kind of acquisition methods of highway congestion index, the method are used as sign original by defining and calculating road conditions parameter
The congestion index of sub- section road conditions；By the dynamic section importance for calculating each atom section in road, it is calculated road and gathers around
Stifled index；Again by the dynamic section importance of each bar road in calculating road network, the congestion index of system-wide net is calculated, specifically
Comprise the steps：
1) the road conditions parameter (as the congestion index in atom section) in each atom section is calculated, following operation is performed：
A) recoverable amount in each atom section is obtained by average speed of traffic flow Inversion Calculation；
B) it is calculated the road conditions parameter in each atom section；
Road conditions parameter proposed by the present invention, refers in unit in empty window, all its hourages of the vehicle for passing through
Sum；Its formalization representation is as follows：
(formula 1)
In formula 1, CI-road conditions parameter；Q-road-section average flow rate；C-number of track-lines；αi- the i-th car equivalent；ti- the i-th
Car passes through the time of empty window during unit；Δ t-space-time widow time；Δ L-space-time length of window.
In the present invention, road conditions parameter is approximately equal to vehicle density；Vehicle density can pass through section recoverable amount and road section length
It is worth to the ratio of track quantity product；And slip-road charge data is based on, we can be average using traffic flow
Velocity inversion method, obtains the recoverable amount in a certain instantaneous section.
2) congestion in road index is calculated, following operation is performed：
A) it is calculated the initial dynamic section importance in each atom section in road；
B) the initial dynamic section importance in each atom section is normalized, obtains the dynamic in each atom section
Section importance；
It is normalized especially by formula 2：
(formula 2)
In formula 2, wjFor the dynamic section importance of atom section j；djThe initial dynamic importance of section j is represented, n is represented
The atom section quantity that present road is included；diRepresent the initial dynamic importance in every atom section that present road is included；
C) it is calculated congestion in road index；
Using the dynamic section importance in each atom section as weight, the calculating of congestion in road index is especially by atom road
The weighted sum of the road conditions parameter of section is obtained；
3) system-wide net congestion index is calculated, following operation is performed：
A) calculate the initial dynamic section importance of each bar road in road network；
The initial dynamic section importance of road is calculated, specifically by the initial dynamic section in each atom section of same road
Importance is added up, and obtains the initial dynamic importance of the road；
B) the initial dynamic section importance of road is normalized, the dynamic section for obtaining each road is important
Property；
C) it is calculated the congestion index of system-wide net；
Using the dynamic section importance of each road as weight, the calculating of road network congestion index is especially by congestion in road
Index is weighted and obtains.
For the acquisition methods of above-mentioned highway congestion index, step 1) in a) by average speed of traffic flow inverting
The recoverable amount in each atom section is calculated, idiographic flow includes：
A1) collect all of charge record；
A2) for wherein one charge record, perform following operation：It is calculated shortest path；It is calculated total trip
The row time；It is calculated average speed on shortest paths；Calculate the hourage in each atom section in the shortest path；
The recoverable amount in the corresponding time period atom section adds 1；
A3) travel through it is all charge record, execution step a2) in operation；
A4) obtain the recoverable amount in each atom section.
For the acquisition methods of above-mentioned highway congestion index, step 2) in be calculated each atom section in road
Initial dynamic section importance, idiographic flow include：
A1) the dynamic section importance in initial all atom sections is set to 0；
A2) obtain and specify time period all charge records；
Record for any bar charge, perform following operation a3)～a5)：
A3) obtain import and export OD combinations (S [i], S [j]) of the record；
A4 the shortest path between the OD) is calculated, shortest path includes some atom sections；
A5) in shortest path, the dynamic section importance in each atom section adds 1；
A6 all charge records) are traveled through, the initial dynamic section importance in each atom section is obtained.
Compared with prior art, the invention has the beneficial effects as follows：
The present invention provides a kind of layering congestion index modeling based on slip-road charge data and congestion index
Acquisition methods, the technical scheme provided by the present invention, can make full use of slip-road charge data, on atom road
The hourage sum of all vehicles for passing through in the empty window in unit is set to road conditions parameter, by road conditions parameter by section aspect
As the basic parameter for portraying road conditions and jam situation.Road conditions parameter is approximately equal to vehicle density, can pass through a certain instantaneous road
The ratio of the vehicle population and road section length and track quantity of section is worth to；The road conditions parameter in atom section as characterizes atom road
The congestion index of Duan Lukuang.On this basis, by the dynamic section importance in each atom section in calculating road, then calculate
To congestion in road index；By the dynamic section importance for calculating each bar road in road network, then the congestion for being calculated system-wide net
Index.The technical scheme that the present invention is provided calculate directly, it is simple, the layering congestion in road index of proposition can systematically, layering
Quantify road conditions secondaryly and portray congestion, the ruuning situation of accurate science ground reflection highway network.Therefore, the present invention is traffic administration
Person provides Transportation Demand Management and control provides decision support, provides trip information reference for traveler, alleviates or reduces at a high speed
Highway congestion, saves social cost.
Description of the drawings
The FB(flow block) of the congestion index acquisition methods that Fig. 1 is provided for the present invention.
Fig. 2 is the flow chart element of the method that recoverable amount is obtained by average speed of traffic flow Inversion Calculation that the present invention is provided
Figure.
The FB(flow block) of the computational methods of the atom section dynamic importance that Fig. 3 is provided for the present invention.
The FB(flow block) of the computational methods of the road dynamic importance that Fig. 4 is provided for the present invention.
Fig. 5 is atom section, hierarchical relational schematic diagram between road and road network；
Wherein, 1-atom section layer；2-path layer, road are made up of one or more atom section；3-road network layer,
Road network is made up of one or more road.
Specific embodiment
Below in conjunction with the accompanying drawings, the present invention is further described by embodiment, but limits the model of the present invention never in any form
Enclose.
The FB(flow block) of the congestion index acquisition methods that Fig. 1 is provided for the present invention；Fig. 4 is atom section, road and road network
Between hierarchical relational schematic diagram, wherein, road is made up of one or more atom section；Road network is by one or more road group
Into.The acquisition methods of congestion index specifically include step：Atom section recoverable amount is obtained by inverting；It is calculated atom section
Road conditions parameter (as the congestion index in atom section)；It is calculated the dynamic importance in atom section；Count on this basis
Calculation obtains the congestion index of road；The dynamic importance of road is calculated again；Gathering around for system-wide net is calculated on this basis
Stifled index.Specifically, each step performs following operation：
1) calculate the road conditions parameter in atom section；
A. calculate the recoverable amount in atom section；Each atom section moment is obtained by average speed of traffic flow Inversion Calculation
Recoverable amount；
Fig. 2 is the FB(flow block) of the method that recoverable amount is obtained by average speed inverse model inverting that the present invention is provided.
The idiographic flow that atom section recoverable amount is obtained by inverting includes：
A1) collect all of charge record；
A2) for wherein one charge record, perform following operation：It is calculated shortest path；It is calculated total trip
The row time；It is calculated average speed on shortest paths；Calculate the hourage in each atom section in the shortest path；
The recoverable amount in the corresponding time period atom section adds 1；
A3) travel through it is all charge record, execution step a2) in operation；
A4) obtain the recoverable amount in each atom section.
B. calculate the road conditions parameter in atom section；
In atom section aspect, it is proposed that road conditions parameter is used as the basic parameter for portraying its road conditions and jam situation, institute
Meaning road conditions parameter, refers in unit in empty window, all vehicles for passing through its hourage sums；Its general formalization table
Show as follows：
(formula 1)
In formula 1, CI is road conditions parameter；Q is road-section average flow rate；C is number of track-lines；tiPass through unit space-time for i-th car
The time of window；Δ t is space-time widow time；Δ L is space-time length of window.
With reference to domain knowledge, the formalization representation (formula 1) to road conditions parameter is deduced, can be obtained：Road conditions parameter is near
Approximately equal to vehicle density；Deduction process is specific as follows：
Our first set scenes：In sometime T, the length in certain the atom section in road network is L, and number of track-lines is C, road
The AFR of section is Q；It is assumed that we calculate road conditions parameter when empty window be the Δ t times, length be Δ L, then empty window when
Interior vehicle number is Q Δ t, and sets these vehicles and be respectively t by the time used by empty window when thisi(i=1 ... Q Δ t)；So,
The road conditions parameter that we define can be represented with formula 1；Wherein, moleculeFor the accumulation used time of vehicle, denominator Δ t Δ LC are right
When empty window normalization, formula 1 further converts and obtains formula 12：
(formula 12)
Here we introduce a concept --- average travel speed according to HCM HCM2000
(average travel speed), average travel speed is：Highway section length is divided by all vehicles by the flat of the section
Equal journey time；So this when empty window in vehicle average travel speedIt is expressed as：
(formula 13)
Average travel speedFor loop condition parameter type minor 12, formula 14 can be obtained：
(formula 14)
In formula 14, Q is flow rate, and C is number of track-lines,For average travel speed.
Referring again to density, the atom section density is the section in T moment vehicle numbers (recoverable amount) and road section length track
The ratio of number, i.e., as shown in following formula (formula 15)：
Again because vehicle number n=flow rate * average time, formula 16 is obtained：
(formula 16)
According to the concept of average travel time introduced above, the average travel time of this n car is represented by formula 17：
(formula 17)
Formula 17 is substituted into into atom section density formula (formula 16) calculating, formula 18 is obtained：
At that time empty window choose it is representative when, when empty window in vehicle average travel speed can represent section
Average travel speed, then CI is equivalent to ρ；
In the middle of practical application, will also be related to vehicle factor, we can be taken in the vehicle equivalent of each car, it is assumed that
When empty window in vehicle i vehicle equivalent be αi, now its formalization formula 1 represent：
(formula 11)
In formula 11, CI-road conditions parameter；Q-road-section average flow rate；C-number of track-lines；αiThe vehicle equivalent of-the i-th car；
ti- the i-th car passes through the time of empty window during unit；Δ t-space-time widow time；Δ L-space-time length of window.
So, further derive such as formula 19：
(formula 19)
It is re-introduced into Weighted harmonic arerageShown in formula following (formula 111)：
(formula 111)
Formula 112 is obtained so：
(formula 112)
Formula 112 generation loop condition parameter is calculated into formula (formula 19), formula 113 is obtained：
(formula 113)
Similarly, equal yield density can be described with following formula (formula 114)：
And according to derivation above, in formula 18, have following relation (formula 115)：
(formula 115)
Therefore, 113～formula of convolution 115, obtains formula 116：
(formula 116)
Can see, in the case where equivalent is considered, it is believed that CI is equivalent to ρ.
After above-mentioned deduction, it can be found that road conditions parameter is in fact equivalent to vehicle density, and it is based on highway and enters
Outlet charge data, we can utilize traffic flow inversion algorithm, obtain the recoverable amount in a certain instantaneous section, then vehicle density
Just can be worth to by the ratio of recoverable amount and road section length and track quantity, that is to say, that
(formula 117)
In formula 117, ρ --- vehicle density；V is section recoverable amount, and L is road section length, and C is track quantity.
2) calculate congestion in road index；
A) the dynamic section importance in each atom section in road is calculated, the initial dynamic importance d of section j is obtainedj；
The FB(flow block) of the computational methods of the section dynamic importance that Fig. 3 is provided for the present invention, as shown in figure 3, calculating dynamic
The flow process of state section importance includes：
A1) the dynamic section importance in initial all atom sections is set to 0；
A2) obtain and specify time period all charge records；
Record for any bar charge, perform following operation a3)～a5)：
A3) obtain import and export OD combinations (S [i], S [j]) of the record；
A4 the shortest path between the OD) is calculated, shortest path includes some atom sections；
A5) in shortest path, the dynamic section importance in each atom section adds 1；
A6 all charge records) are traveled through, the initial dynamic section importance in each atom section is obtained；
B) the initial dynamic section importance in each atom section is normalized, obtains the dynamic in each atom section
Section importance；It is normalized especially by formula 2：
(formula 2)
In formula 2, djWhat is represented is the initial dynamic importance of section j, and n represents the atom section number that present road is included
Amount；diRepresent the initial dynamic importance in every atom section that present road is included.
C) it is calculated congestion in road index；
Congestion in road index is obtained by the weighted sum of the basic road conditions parameter in atom section, formalization representation such as formula 21：
(formula 21)
In formula 21, wjWhat is represented is the dynamic section importance of section j；CIjRepresent the congestion index of section j；CIRRepresent
The congestion index of road R；Road R includes j bar atoms section.
3) calculate system-wide net congestion index：
A) the dynamic section importance of each bar road in road network is calculated, the initial dynamic importance d of road k is obtainedrk；
The computational methods and step 2 of the dynamic section importance of road) in calculate each atom section dynamic section it is important
Property method be similar to, method flow as shown in figure 4, calculate road dynamic section importance, specifically by each original of same road
The initial dynamic section importance in sub- section is added up, and obtains the initial dynamic importance of the road；
B) the initial dynamic importance of road is normalized, obtains the dynamic section importance of each road；Tool
Body is normalized by formula 22：
(formula 22)
In formula 22, wrkThe dynamic importance of the road k obtained after representing normalized；drkRepresent the first initiating of road k
State importance；drmWhat is represented is the initial dynamic importance of road m, and R represents the road quantity that current road network is included.
C) it is calculated the congestion index of system-wide net；
The congestion index of system-wide net is obtained by the weighted sum to congestion in road index, formalization representation such as formula 23：
(formula 23)
In formula 23, road network N includes R bar roads；CINRepresent the congestion index of system-wide net；wrmWhat is represented is the dynamic of road m
Importance；CIrmRepresent the congestion index of road m.
Below by example, the invention will be further described.
It is assumed that a charge record shows that the car sails highway network from A websites at the T1 moment, sail from B websites at the T2 moment
Go out highway network, the shortest path between website A, B includes two atom sections m, n, and length is respectively L1, L2, then the garage
The average speed sailedRunning time on two atom sections is respectivelyWithThen we recognize
It is the car at the T1 moment to T1+t1Moment on the m of section, in T1+t1Moment travels through all charge notes to the T2 moment on the n of section
Record, it is possible to which (calculation process of recoverable amount is as schemed in instantaneous vehicle number not in the same time, i.e. recoverable amount to obtain each atom section
Shown in 2).
It is assumed that a road A includes two atom sections A1, A2, v1, v2, its flow are respectively in its recoverable amount of t1 moment
Respectively q1, q2, the number of track-lines of atom section A1, A2 are respectively C1, C2, and the length of atom section A1, A2 is respectively L1, L2；
The section importance for then having atom section A1 isRoad conditions parameter isAtom section
The section importance of A2 isRoad conditions parameter isIt is CI that the congestion index of road A is road conditions parameterA
=CI1*W1+CI2*W2。
It is assumed that a highway network N includes two road A, B, at the t1 moment, its flow is respectively qA、qB, congestion index point
Wei not CIAAnd CIB。
The section importance for then having road A isThe section importance of road B isSystem-wide
The congestion index of net N is CIN=CIA-WA+CIB*WB。
It should be noted that the purpose for publicizing and implementing example is help further understands the present invention, but the skill of this area
Art personnel be appreciated that：In without departing from the present invention and spirit and scope of the appended claims, various substitutions and modifications are all
It is possible.Therefore, the present invention should not be limited to embodiment disclosure of that, and the scope of protection of present invention is with claim
The scope that book is defined is defined.
Claims (6)
1. a kind of acquisition methods of highway congestion index, the method are used as sign atom by defining and calculating road conditions parameter
The congestion index of section road conditions；By the dynamic section importance for calculating each atom section in road, congestion in road is calculated
Index；Again by the dynamic section importance of each bar road in calculating road network, the congestion index of system-wide net is calculated, it is concrete to wrap
Include following steps：
1) the road conditions parameter in each atom section is calculated, it is as the congestion index in atom section, concrete to perform following operation：
A) recoverable amount in each atom section is obtained by average speed of traffic flow Inversion Calculation；
B) it is calculated the road conditions parameter in each atom section；The road conditions parameter is in unit in empty window, all to pass through
Vehicle its hourage sum, is represented by formula 1：
In formula 1, the road conditions parameter in CI-atom section；Q-road-section average flow rate；C-number of track-lines；ti- the i-th car passes through unit
When empty window time；Δ t-space-time widow time；Δ L-space-time length of window；
2) congestion in road index is calculated, it is concrete to perform following operation：
A) it is calculated the initial dynamic section importance in each atom section in road；
B) the initial dynamic section importance in each atom section is normalized, obtains the dynamic section in each atom section
Importance；
C) using the dynamic section importance in each atom section as weight, by the weighted sum of the road conditions parameter in atom section
It is calculated congestion in road index；
3) system-wide net congestion index is calculated, it is concrete to perform following operation：
A) calculate the initial dynamic section importance of each bar road in road network；
B) the initial dynamic section importance of road is normalized, obtains the dynamic section importance of each road；
C) it is using the dynamic section importance of each road as weight, complete by being weighted to congestion in road index and being calculated
The congestion index of road network.
2. the acquisition methods of highway congestion index as claimed in claim 1, is characterized in that, step 1) in a) by traffic
Stream average speed Inversion Calculation obtains the recoverable amount in each atom section, and idiographic flow includes：
A1) collect all of charge record；
A2) for wherein one charge record, perform following operation：It is calculated shortest path；When being calculated total travelling
Between；It is calculated average speed on shortest paths；Calculate the hourage in each atom section in the shortest path；Accordingly
The time period recoverable amount in the atom section adds 1；
A3) travel through it is all charge record, execution step a2) in operation；
A4) obtain the recoverable amount in each atom section.
3. the acquisition methods of highway congestion index as claimed in claim 1, is characterized in that, step 1) described in road conditions parameter
It is approximately equal to vehicle density；The vehicle density is by the section recoverable amount and the ratio of road section length and track quantity product
Obtain.
4. the acquisition methods of highway congestion index as claimed in claim 1, is characterized in that, step 2) in step a) calculate
The initial dynamic section importance in each atom section in road is obtained, idiographic flow includes：
A1) the dynamic section importance in initial all atom sections is set to 0；
A2) obtain and specify time period all charge records；
Record for any bar charge, perform following operation a3)～a5)：
A3) obtain import and export OD combinations (S [i], S [j]) of the record；
A4 the shortest path between the OD) is calculated, shortest path includes some atom sections；
A5) in shortest path, the dynamic section importance in each atom section adds 1；
A6 all charge records) are traveled through, the initial dynamic section importance in each atom section is obtained.
5. the acquisition methods of highway congestion index as claimed in claim 1, is characterized in that, step 2) in step b) it is concrete
It is normalized by formula 2：
In formula 2, wjFor the dynamic section importance of atom section j；djThe initial dynamic section importance of section j is represented, n is represented
The atom section quantity that present road is included；diThe initial dynamic section for representing every atom section that present road is included is important
Property.
6. the acquisition methods of highway congestion index as claimed in claim 1, is characterized in that, step 3) in step a) calculate
The initial dynamic section importance in each atom section of same road is specifically tired out by the initial dynamic section importance of road
Plus, obtain the initial dynamic section importance of the road.
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| CN107134130A (en) * | 2016-02-26 | 2017-09-05 | 高德信息技术有限公司 | A kind of traffic guidance drawing generating method and device |
| CN106157619B (en) * | 2016-07-12 | 2018-09-21 | 浙江大学 | Road network is in fortune vehicle number calculating method under hypersaturated state |
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