CN103871233A - Traffic incident information publishing method based on floating car data - Google Patents
Traffic incident information publishing method based on floating car data Download PDFInfo
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- CN103871233A CN103871233A CN201210505794.8A CN201210505794A CN103871233A CN 103871233 A CN103871233 A CN 103871233A CN 201210505794 A CN201210505794 A CN 201210505794A CN 103871233 A CN103871233 A CN 103871233A
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Abstract
The invention discloses a traffic incident information publishing method based on floating car data, and belongs to the field of intelligent traffic. The method comprises the following steps: a traffic incident road chain is detected, and the actual range of influence of a traffic incident is detected according to the traffic incident road chain; and the extended range of traffic incident information publishing is determined, wherein the actual range of influence of a traffic incident and the extended range of traffic incident information publishing jointly constitute the range of traffic incident information publishing. The invention proposes the traffic incident information publishing method based on floating car data in view of the defect of current traffic incident information publishing range determination, and proposes a method for detecting the actual range of influence of a traffic incident and a method for calculating the extended range of traffic incident information publishing based on the features of floating car data so as to determine the range of traffic incident information publishing in each cycle. The range of traffic incident information publishing is updated once a cycle according to the change of traffic flow.
Description
Technical field
The present invention relates to intelligent transportation field, particularly a kind of traffic event information dissemination method based on floating car data.
Background technology
Along with the develop rapidly in city, the sharply increase of road traffic demand, traffic congestion becomes the serious problems that each big city faces, and all kinds of traffic events bring larger pressure to limited road infrastructure.Reasonably traffic event information is distributed to the driver who sails for love scene, can make driver avoid love scene, or the event of the avoiding traffic congestion region of bringing, thereby effectively reduce the transport need at traffic events scene, improve love scene treatment effeciency, avoid second accident, alleviate traffic congestion, the minimization of loss that traffic events is caused.
Adopt advanced transportation information service systems, obtain real time traffic data by data acquisition system (DAS), through overall treatment, predicting traffic flow, and issue real-time road condition information by network, broadcast, mobile phone, variable information plate or on-vehicle navigation apparatus etc., guiding driver's choose reasonable path, avoids traffic events coverage, becomes current study hotspot problem.In addition, Floating Car is the advanced technology means of obtaining Real-time Road transport information that adopt in traffic information system in recent years, compare with the point of fixity acquisition means such as traditional Road Detection technology and Video Supervision Technique, Floating Car has the advantages such as low cost, easily installation, easy care, measurement range are wide.Therefore, traffic event information dissemination method and the system significance of research based on floating car data is great.
Determine method for traffic events coverage, the application for a patent for invention of Chinese Patent Application No. 201110225774.0, " a kind of method for predicting grades of spatial effect ranges of traffic event effects on city expressways " by name provides a kind of method for predicting grades of spatial effect ranges of traffic event effects on city expressways.The method is obtained a large amount of city expressway traffic abnormity event cases, subsequently case is divided into at least two classes according to event space coverage, again using event space coverage as categorical attribute, all the other attributes are classified as judgement attribute, generate decision tree, subsequently, calculate the cluster centre value of the each leaf node of decision tree, maximal value or minimum value, in the time that traffic events occurs, the data of judging attribute according to it find corresponding leaf node in decision tree, read the cluster centre value of this leaf node, maximal value or minimum value, affect the predicted value of spatial dimension grade as traffic events.The attribute data that in this application for a patent for invention, each event case comprises is that event type, weather conditions, events affecting number of track-lines, event spot bottleneck type, event lateral attitude occurs, whether need towed vehicle, whether need ambulance, whether relate to oversize vehicle, event Location background traffic behavior, whether in peak period and event space coverage.
The application for a patent for invention of Chinese Patent Application No. 201110358727.3, " a kind of definite method of highway burst traffic events coverage " by name provides a kind of definite method of highway burst traffic events coverage, relates on the basic freeway sections of controlling discrepancy completely accident occurs.The volume of traffic and the density of the method based on detector acquisition upstream row track and incident point; Utilize shock wave theory calculate the velocity of wave of crowded ripple and affect length; What judgement drew affects the length whether length exceeds incident and put gateway, current upstream ring road; Finally determine the coverage of accident.
Traffic events coverage basis for forecasting several factors at present, as according to whether having oversize vehicle, whether needing towed vehicle, ambulance, fire truck etc., classifies event.But these factors cannot be obtained by floating vehicle data acquisition system and traffic event information text description, be to be difficult to specific, concrete at short notice, implement difficulty.In addition, the scope that traffic events affects the prediction of spatial dimension grade prediction technique is maximum effect scope, can not reflect in real time the Spatial-Temporal Change Trend of the lower traffic flow of traffic events impact.
In addition, the existing method of utilizing traffic flow wave theory to determine events affecting scope, the volume of traffic and the density based on track, detector acquisition upstream and incident point, but the transportation information service systems take Floating Car as Data Source can only be obtained the information such as speed and quantity of Floating Car, cannot obtain the volume of traffic and the density of track, upstream and incident point, current events affecting scope determines that method cannot effectively be applied in the transportation information service systems based on floating car data.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of traffic event information dissemination method based on floating car data, for determine the coverage of traffic events based on floating car data.
The invention provides a kind of traffic event information dissemination method based on floating car data, comprising:
Detect traffic events road chain, detect traffic events actual influence scope according to described traffic events road chain; Determine the spreading range that traffic event information is issued, the spreading range that traffic events actual influence scope and traffic event information are issued forms the scope of release of traffic event information jointly.
The present invention is directed to the definite deficiency in current traffic event information scope of release, traffic event information dissemination method based on floating car data is proposed, in conjunction with floating car data own characteristic, the detection method and the traffic event information that propose traffic events actual influence scope are issued the computing method of spreading range, and then determine the traffic event information scope of release in each cycle.Traffic event information scope of release is according to the situation of change of traffic flow, and each cycle real-time update once.
Accompanying drawing explanation
The dissemination method process flow diagram of the traffic event information based on floating car data that Fig. 1 provides for the embodiment of the present invention;
Fig. 2 is the method flow diagram that detects traffic events actual influence scope in the embodiment of the present invention;
Fig. 3 is the schematic diagram of traffic event information scope of release in the embodiment of the present invention;
The traffic event information dissemination method that Fig. 4 provides for the embodiment of the present invention realize schematic diagram.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, the present invention is described in further detail.
The embodiment of the present invention is for the definite deficiency in current traffic event information scope of release, traffic event information dissemination method based on floating car data is proposed, in conjunction with floating car data own characteristic, the detection method and the traffic event information that propose traffic events actual influence scope are issued the computing method of spreading range, and then determine the traffic event information scope of release in each cycle.Traffic event information scope of release is according to the situation of change of traffic flow, and each cycle real-time update once.
The dissemination method of the traffic event information based on floating car data as shown in Figure 1, comprises the following steps:
Whether driver is concerned about whether road becomes and blocks up or slowly, can exert an influence to his driving process; If the section of the event of generation, traffic is still unblocked, and driver can ignore this event.So the target of the embodiment of the present invention is not to tell driver front that traffic events occurs, whether driver is exerted an influence but detect blocking up of traffic events generation, then tell driver, driver is had ample time and select to detour path.The standard of reflection events affecting is traffic congestion or slow.Category of roads difference, the velocity range difference of blocking up.Definition traffic behavior: unimpeded, walk or drive slowly, block up, grade is respectively 1,2,3, as shown in the table:
Table 1
In table, FC represents category of roads, and v is travel speed.Represent to lead to the different directions of traffic events road chain with m, represent the upstream road chain centered by the chain of traffic events road with n, detect the concrete steps of traffic events actual influence scope as shown in Figure 2, comprising:
Till being defined into and obtaining traffic events text description information, the time that event has continued is t
0, occurring to from traffic events the duration that traffic events is disposed is t
last.Due in the time obtaining traffic event information, from limited data, can not calculate the end time of traffic events, but As time goes on, system can detect the traffic events end time automatically, and then obtain the traffic events duration, therefore occur to from traffic events the duration t that traffic events is disposed
lastcomputing formula be:
t
last=t
0+α·T
Wherein α is integer, and T represents the floating car data sampling period.Some moment between (α-1) of traffic events end time after obtaining traffic events text description information T cycle and the α T cycle: during when (α-1) T cycle, system detects traffic events and do not finish; When α T cycle, system detection event finishes, t
last=t
0+ α T.But data acquisition system (DAS) can not be exported the data of half period, judges that whether traffic events finishes data used is complete cycles, so α is integer.
Definition
for vehicle drives to the required time of events affecting region with 75% bit rate, because incident duration has directly reflected the size of event, determine the coverage of event, therefore,
time of having continued with event of value relevant, according to t
lastsize determine
value, specific as follows:
Wherein, t
1, t
2, t
3, t
4the empirical value obtaining according to a large amount of historical data analysis is determined.
By the historical data of at least one month, can obtain the 75% bit rate v of road chain j at moment i
75%(i, j) (all speed is sorted from small to large, and the 75%th locational speed that comes is 75% bit rate.Calculating 75% bit rate is in order to obtain the speed larger than history average on the one hand, makes traffic event information issue spreading range and covers wider; That the speed value that causes for fear of velocity perturbation is excessive on the other hand).
Definition Length (j) represents the length of road chain j, Φ represents the upstream road chain label of traffic events actual influence scope, Ω represents that the upstream of spreading range that traffic event information is issued affects border road chain label, and road chain label is from upstream to downstream and increases successively, as shown in Figure 3.
The spreading range L that traffic event information is issued
e(i) computing formula is:
The length sum of the spreading range You Duotiao road chain that traffic event information is issued obtains, and length meets condition below:
Wherein, s.t.(subject to) be mathematic sign, the affined meaning, inequality below represents constraint condition.S.t. formula is below formula
qualifications, be used for judging the condition that spreading range need to be satisfied:
represent to start to travel with 75% bit rate from road chain Ω
time one arrives chain Φ-1, adjacent road, upstream of road chain Φ surely;
represent to start to travel with 75% bit rate from chain Ω-1, adjacent road, upstream of road chain Ω
time can not arrive chain Φ-1, adjacent road, upstream of road chain Φ.Qualifications is mainly in order to find this border of chain Ω, road.
The method of determining the spreading range of traffic event information issue specifically comprises the following steps:
Step 1031, judge that whether traffic affected by traffic events, if do not had, finishes; Otherwise detect lasting time t according to floating car data
0, and be t
lastinitialize, t
last=t
0.
The extension length L that step 1032, calculating traffic event information are issued
e(i).
Step 1033, judge extension length L
e(i) in, whether there is the outlet that arrives replaceable path, if had, determine that spreading range is L
e(i); If no, upstream extend, until have two outlets, and the spreading range that definite current period traffic event information is issued is two exits, upstream.
Step 1034, renewal one-period, judge whether influenced traffic recovers normally, if recover normal, finishes; If do not recovered, whether decision event is disposed, if so, and incident duration t
last=t
last-T; If event is not disposed, t
last=t
last+ T, execution step 1032.
Wherein, determine that be disposed time and traffic of traffic events recovers the method for normal time and be:
One, traffic events is disposed, and traffic starts the determination methods of recovering:
Definition of T S(i, j) be the traffic behavior of road chain j at moment i, there is the road chain label of traffic events in link_incident, works as TS(i, j) while meeting below one of condition, decision event is disposed, influenced traffic starts to recover:
1, TS (i-1, link_incident) <TS (i-2, link_incident) and TS (i, link_incident) <TS(i-2, link_incident);
2, TS(i, link_incident-1) <TS(i-1, link_incident-1), and TS(i, link_incident) <TS(i-1, link_incident).
Two, traffic events affects the determination methods finishing completely: definition N
imp(i) be the actual influenced road of i moment event chain number, work as N
imp(i), judge that traffic events impact finishes completely at=0 o'clock.
Fig. 4 is the schematic diagram of realizing of the embodiment of the present invention, and traffic event information scope of release according to the each cycle real-time update of the situation of change of traffic flow once.
The traffic event information dissemination method that the embodiment of the present invention proposes, can utilize floating car data and event information text description, obtain the influenced scope of reality of traffic events, and the spreading range of estimated information issue, solve the limitation that Floating Car cannot gather the data such as flow, density, expand the range of application of floating car data in traffic information issue field, for the application of Floating Car in traffic information issue field provides solid theoretical foundation and Technical Reference.In addition, consider the spreading range that traffic event information is issued, guarantee that vehicle is in the time receiving event information, the selection alternative route that has ample time, reaches the effect that induce in path.
In a word, the foregoing is only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.
Claims (7)
1. the traffic event information dissemination method based on floating car data, is characterized in that, comprising:
Detect traffic events road chain, detect traffic events actual influence scope according to described traffic events road chain; Determine the spreading range that traffic event information is issued, the spreading range that traffic events actual influence scope and traffic event information are issued forms the scope of release of traffic event information jointly.
2. the traffic event information dissemination method based on floating car data according to claim 1, is characterized in that, the step of described detection traffic events road chain specifically comprises:
In conjunction with traffic events text description information and floating car data, determine traffic events road chain according to the velocity variations difference of upstream and downstream road chain.
3. the traffic event information dissemination method based on floating car data according to claim 1 and 2, is characterized in that, the step of described detection traffic events actual influence scope specifically comprises:
Traffic behavior be set be unimpeded, walk or drive slowly, block up, grade is respectively 1,2,3; Represent to lead to the different directions of traffic events road chain with m, represent the upstream road chain centered by the chain of traffic events road with n, if traffic events road chain speed is not smooth,
A, initialization m=1, n=1;
B, obtain m n article of the direction upstream road chain that can arrive traffic events road chain;
C, judge the traffic behavior of n article of road chain of described m direction, if traffic behavior is not less than the traffic behavior of event road chain, n=n+1, execution step B; If traffic behavior is less than the traffic behavior of event road chain, judge the traffic behavior of m direction n+1Tiao road chain, if this traffic behavior is not less than the traffic behavior of event road chain, n=n+1, execution step B; Otherwise, determine that n-1Tiao road chain is that m direction affects border road chain in the upstream in this cycle;
D, to judge whether each direction judges complete, if not m=m+1, and n=1; Otherwise this cycle traffic events actual influence range detection finishes.
4. the traffic event information dissemination method based on floating car data according to claim 3, is characterized in that, the step of the spreading range that described definite traffic event information is issued specifically comprises:
A, be defined into and obtain traffic events text description information till, the time that traffic events has continued is t
0, occurring to from traffic events the duration that traffic events is disposed is t
last, t
last=t
0+ α T, wherein α is integer, T represents the floating car data sampling period;
B, affect when traffic is subject to traffic events, detect t according to floating car data
0, and be t
lastinitialize, t
last=t
0;
C, obtain traffic event information issue extension length L
e(i);
D, judge described extension length L
e(i) in, whether there is the outlet that arrives replaceable path, if had, determine that the spreading range that traffic event information is issued is L
e(i); Otherwise upstream extend, until have two outlets, and the spreading range that definite current period traffic event information is issued is two exits, upstream;
E, renewal one-period, judge whether influenced traffic recovers normally, if recover normal, finishes; Otherwise judge whether traffic events is disposed, if so, traffic events duration t
last=t
last-T; If traffic events is not disposed, t
last=t
last+ T, execution step c.
5. the traffic event information dissemination method based on floating car data according to claim 4, is characterized in that, described in obtain traffic event information issue extension length L
e(i) step specifically comprises:
Definition
for vehicle drives to the required time of traffic events range of influence with 75% bit rate,
value be:
Wherein, t
1, t
2, t
3, t
4the empirical value obtaining according to historical data analysis is determined; By the historical data of at least one month, obtain the 75% bit rate v of road chain j at moment i
75%(i, j);
Definition Length (j) represents the length of road chain j, Φ represents the upstream road chain label of traffic events actual influence scope, Ω represents that the upstream of spreading range that traffic event information is issued affects border road chain label, and road chain label is from upstream to downstream and increases successively;
,
Length meets condition below:
6. the traffic event information dissemination method based on floating car data according to claim 5, is characterized in that, describedly judges whether influenced traffic recovers normal step and specifically comprise:
Definition N
imp(i) be the actual influenced road of i moment traffic events chain number, work as N
imp(i), judge that influenced traffic recovers normal at=0 o'clock.
7. the traffic event information dissemination method based on floating car data according to claim 5, is characterized in that, the described method that judges whether traffic events is disposed specifically comprises:
Definition of T S(i, j) be the traffic behavior of road chain j at moment i, there is the road chain label of traffic events in link_incident, works as TS(i, j) while meeting below one of condition, judge that traffic events is disposed:
TS(i-1, link_incident) <TS(i-2, link_incident), and TS(i, link_incident) <TS(i-2, link_incident);
TS(i, link_incident-1) <TS(i-1, link_incident-1), and TS(i, link_incident) <TS(i-1, link_incident).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111915907A (en) * | 2020-08-18 | 2020-11-10 | 河南中天高新智能科技股份有限公司 | Multi-scale traffic information publishing system and method based on vehicle-road cooperation |
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| JP2006023886A (en) * | 2004-07-07 | 2006-01-26 | Nissan Motor Co Ltd | Traffic information system |
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