CN102542831B - Variable speed-limit control method of expressway based on real-time traffic flow and weather information - Google Patents
Variable speed-limit control method of expressway based on real-time traffic flow and weather information Download PDFInfo
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- CN102542831B CN102542831B CN201110422688.9A CN201110422688A CN102542831B CN 102542831 B CN102542831 B CN 102542831B CN 201110422688 A CN201110422688 A CN 201110422688A CN 102542831 B CN102542831 B CN 102542831B
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Abstract
The invention relates to a variable speed-limit control method of expressway based on real-time traffic flow and weather information, which can automatically regulate the speed limit values under various traffic flows and weather conditions according to real-time change of the traffic flows and the weather states, and send the speed limit message to a driver by a variable message board, so as to reduce traffic accident risk. The invention is featured by making use of a traffic flow detection device and a weather environment detection device to obtain real-time traffic flow and weather parameters, automatically regulating the speed limit according to various traffic flows and weather states to overcome the defect and shortcoming that the prior road speed limit can only be fixed and unchanged. Therefore, a dynamic speed limit method according to the real-time traffic flow and weather information has an actual engineering application value in the expressway traffic management and control aspect.
Description
Technical field
The invention belongs to traffic intelligent management and control technology field, according to arithmetic for real-time traffic flow and weather condition, carry out the dynamic Control for Speed Limitation in through street, is a kind of through street variable speed-limiting control method based on arithmetic for real-time traffic flow and weather condition.
Background technology
Road speed limit problem is the hot issue that traffic safety receives much concern always.According to 2005 and the statistics of traffic accidents annual report > > of < < The Ministry of Public Security of the People's Republic of China, MOPS in 2006, within 2005～2006 years, approximately there is 10% accident relevant with Vehicle Driving Cycle hypervelocity, rank first of various culprit.There are some researches show that the higher row speed of sailing can bring higher risk of collision and severity of injuries, because under the condition of running at high speed, driver does not have enough reflecting times to take corresponding measure to avoid dangerous situation to occur, for example front truck is braked suddenly acceleration, other vehicles enter track.Thereby under specified link and environmental baseline, if driver drives to significantly improve road safety by the reasonable speed of a motor vehicle.
Road traffic flow running status real-time change, and traditional road speed limit is fixed value, cannot dynamically carry out speed limit adjusting according to Real-time Road traffic flow ruuning situation.Under some traffic flow modes, vehicle flowrate is larger, and Vehicle Speed is lower, but speed limit remains higher speed limit, causes part vehicle speed too fast, has strengthened velocity contrast between vehicle, thereby has increased accident risk.In addition, driver, owing to cannot understanding road ahead traffic behavior (such as the queuing etc. of blocking up), therefore easily causes speed of operation too fast, has little time to slow down, thereby bring out traffic hazard when noticing the place ahead traffic problems.Therefore, according to the through street variable speed-limiting control method of traffic flow running rate, obtained in recent years external numerous traffic scholars' concern.
Adverse weather not only can produce harmful effect to vehicle safety operation, and meeting appreciable impact driver reflecting time, for example, in the greasy weather, because sight line is bad, driver need to recognize leading vehicle distance for more time, thereby under adverse weather, speed limit is different from generally speed limit.Under adverse weather, the unreasonable speed of a motor vehicle easily causes traffic safety accident, there are some researches show under adverse weather in the unit interval that the accident number of adverse weather is several times of fine days or even tens times, and mostly has been great and serious accident.2007, the traffic hazard under adverse weather caused the whole nation approximately 17600 people dead, and 85200 people are injured, and direct property loss reaches 3.18 hundred million Renminbi.Thereby under research adverse weather, thereby Speed Limitation on Freeway guarantees that road traffic safety is important and has practical study meaning problem, and there are more and more traffic scholars to put into the research of road traffic safety aspect under adverse weather both at home and abroad.Adverse weather comprises: mist, rain, snow, wind etc.
Application along with the advanced traffic control system of current I ntelligent Transportation System (ITS) intelligent transportation system and Advanced Transportation Management System (ATMS), traffic control center can obtain traffic flow accurately and weather data in real time, such as present speed, flow, occupation rate, temperature, visibility, rainfall, pavement state, wind direction etc. by traffic flow and weather monitoring device.The dynamically changeable Control for Speed Limitation of carrying out based on arithmetic for real-time traffic flow and Weather information that is retrieved as of traffic flow and state of weather data is had laid a good foundation.Utilize all kinds of parameter values of traffic flow and weather monitoring equipment Inspection, carry out the calculating of the reasonable speed limit in current through street, and real-time release is to driver, reduces Vehicle Speed on road, for improving China's Expressway Traffic security status, there is important engineering application value.
Summary of the invention
The problem to be solved in the present invention is: traditional road speed limit is fixed value, cannot dynamically carry out speed limit adjusting according to Real-time Road traffic flow ruuning situation, need to overcome the changeless defect of through street speed limit in the past, foundation is carried out dynamic speed-limiting control method according to arithmetic for real-time traffic flow and state of weather, according to the traffic flow and the weather condition that change, regulate in real time through street speed limit, improve traffic safety.
Technical scheme of the present invention is: the through street variable speed-limiting control method based on arithmetic for real-time traffic flow and Weather information, by control system, the speed limit of through street is controlled, control system comprises checkout equipment, backstage central computer and electronic intelligence plate, checkout equipment and electronic intelligence plate are arranged on through street, and variable-ratio control method is:
1) traffic flow and Weather information checkout equipment are set on through street, collect traffic flow and the Weather information of road to be controlled region, telecommunication flow information comprises speed, flow and occupation rate, Weather information comprises visibility, rainfall, pavement state and wind direction information, and accuracy of detection is to detect once for every 5 minutes;
2) parameters detecting is transferred in the central computer of backstage, judge current time, control system is only carried out speed limit control at the 7:00-19:00 of a day in the time period simultaneously, if not at this moment between in section, on electronic intelligence plate, show " keeping the speed of a motor vehicle, safety traffic ";
3) the arithmetic for real-time traffic flow situation detecting according to coil judges that whether traffic flow is in non-freestream conditions, when traffic flow parameters detection equipment Inspection to 5 minutes in each track traffic flow average density while being greater than 18pcu/km/lane, start variable speed-limit control system, otherwise electronic intelligence plate shows this through street acquiescence speed limit; In the sense cycle of 5 minutes traffic flow parameters detection equipment Inspection to 85% speed of a motor vehicle and the difference of current speed limit while being more than or equal to 5km/h, it is that current speed limit adds 10km/h that variable speed-limit control system regulates speed limit automatically; In sense cycle traffic flow parameters detection equipment Inspection to 85% speed of a motor vehicle and during current be less than or equal to-5km/h of speed limit value difference, it is that current speed limit subtracts 10km/h that variable speed-limit control system regulates speed limit automatically; When the absolute value of 85% speed of a motor vehicle detecting and the difference of current speed limit is less than 5km/h, do not regulate current speed limit in sense cycle;
4) meteorologic parameter detecting according to weather monitoring device judges whether to occur poor weather, thereby determine whether to start variable speed-limit, controls; The meteorologic parameter detecting is transferred in the central computer of backstage, according to each meteorologic parameter, automatically calculate optimum speed limit: according to road state of visibility, calculate visibility speed limit, according to rainfall situation, calculate rainfall speed limit, according to state computation icy on road, go out icing speed limit, according to wind direction situation, calculate wind-force speed limit, 4 speed limits that calculate compare, and get value that wherein speed limit is minimum as the meteorological safety speed-limit value of current through street;
5) get according to lower value in the speed limit calculating under traffic flow modes and poor weather as current safety speed limit;
6) by step 5) the current safety speed limit that calculates and through street is the highest and minimum permission speed limit compares, judge whether current safety speed limit needs to regulate; As current safety speed limit as described between the highest and minimum speed limit, with this speed limit, can be used as optimum speed limit under precondition and issue; If not between the highest described and minimum permission speed limit, in the highest and minimum permission speed limit, select to approach most step 5) the value of current safety speed limit as optimum speed limit under precondition, issue;
7) after completing the one-period detection of 5 minutes, control system detects traffic flow and state of weather in next cycle automatically, dynamically adjusts optimum speed limit issue according to real road traffic and weather condition.
When through street has the section of the different speed limits of multistage, every section is carried out respectively variable speed-limit control, the section of being controlled by through street final stage variable speed-limit starts, detect itself and adjacent upstream variable speed-limit and control speed limit poor in section, two adjacent variable speed-limits are controlled speed limit value difference between section and are less than or equal to 20km/h, otherwise reduce the speed limit in the section that speed limit is higher, this process until detect reaches first variable speed-limit of through street to be controlled section and finishes, and determines that each variable speed-limit controls the optimum speed limit in section.
Each optimum speed limit in variable speed-limit control section and the actual speed limit in current each section determined are compared, if each variable speed-limit is controlled the difference of the optimum speed limit in section and each actual speed limit in section and is greater than 10km/h, adjust, adjust speed limit change step at every turn and be no more than 10km/h;
Each section speed limit of determining is issued by trackside electronic variable advices plate, realized according to the through street variable speed-limit of arithmetic for real-time traffic flow and Weather information and controlling.
The traffic flow detecting when traffic flow and weather detecting device and state of weather become when good, close variable speed-limit regulation and control system, and through street speed limit reverts to initial default value, i.e. section Maximum speed limit value.
The invention discloses a kind of through street variable speed-limiting control method based on arithmetic for real-time traffic flow and Weather information, detection system gathers road arithmetic for real-time traffic flow and state of weather by traffic flow and weather monitoring equipment according to some cycles; According to the traffic flow and the weather parameters that gather, calculate optimum speed limit under current traffic flow and weather condition, and judge whether to enable variable speed-limit control; If enable variable speed-limit, control, trackside variable information board is issued new speed limit, if do not start system, enters next cycle, according to next periodic condition, judges.Thereby advantage of the present invention is to utilize traffic flow and weather monitoring equipment to obtain arithmetic for real-time traffic flow and state of weather carries out dynamic speed limit adjusting, the shortcomings and deficiencies that speed limit in the past cannot regulate according to the traffic flow changing and state of weather have been overcome.Thereby this method has actual engineering application to be worth with controlling party mask carrying out the management of dynamic speed limit according to arithmetic for real-time traffic flow and weather condition.
Accompanying drawing explanation
Fig. 1 is that variable speed-limit is controlled startup decision flow chart.
Fig. 2 is reasonable speed limit calculation flow chart under poor weather.
Fig. 3 is for to determine reasonable speed limit process flow diagram according to traffic flow modes.
Embodiment
The present invention proposes and a kind ofly based on arithmetic for real-time traffic flow and Weather information, carry out through street variable speed-limiting control method, comprise the following steps:
1) traffic flow and Weather information checkout equipment are set on through street, collect traffic flow and the Weather information of road to be controlled region, telecommunication flow information comprises speed, flow, occupation rate, Weather information comprises visibility, rainfall, pavement state, wind direction information, and accuracy of detection is to detect once for every 5 minutes.
2) parameters detecting is transferred in central computer.Judge current time, variable speed-limit control system plays control action in (7:00AM-7:00PM) time period only by day simultaneously.If not at this time, on electronic intelligence plate, show " keeping the speed of a motor vehicle, safety traffic ".
3) the arithmetic for real-time traffic flow situation detecting according to coil judges that whether traffic flow is in non-freestream conditions, when traffic flow parameters detection equipment Inspection to 5 minutes in each track traffic flow average density while being greater than 18pcu/km/lane, start variable speed-limit control system, as Fig. 1, otherwise electronic intelligence plate shows this through street acquiescence speed limit; In the sense cycle of 5 minutes traffic flow parameters detection equipment Inspection to 85% speed of a motor vehicle and the difference of current speed limit while being more than or equal to 5km/h, it is that current speed limit adds 10km/h that variable speed-limit control system regulates speed limit automatically; In sense cycle traffic flow parameters detection equipment Inspection to 85% speed of a motor vehicle and during current be less than or equal to-5km/h of speed limit value difference, it is that current speed limit subtracts 10km/h that variable speed-limit control system regulates speed limit automatically; When the absolute value of 85% speed of a motor vehicle detecting and the difference of current speed limit is less than 5km/h, do not regulate current speed limit in sense cycle;
4) meteorologic parameter detecting according to weather monitoring device judges whether to occur poor weather, controls, as Fig. 2 thereby determine whether to start variable speed-limit; The meteorologic parameter detecting is transferred in the central computer of backstage, according to each meteorologic parameter, automatically calculate optimum speed limit: according to road state of visibility, calculate visibility speed limit, according to rainfall situation, calculate rainfall speed limit, according to state computation icy on road, go out icing speed limit, according to wind direction situation, calculate wind-force speed limit, 4 speed limits that calculate compare, and get value that wherein speed limit is minimum as the meteorological safety speed-limit value of current through street;
5) get according to lower value in the speed limit calculating under traffic flow modes and poor weather as current safety speed limit;
6) by step 5) the current safety speed limit that calculates and through street is the highest and minimum permission speed limit compares, judge whether current safety speed limit needs to regulate; As current safety speed limit as described between the highest and minimum speed limit, with this speed limit, can be used as optimum speed limit under precondition and issue; If not between the highest described and minimum permission speed limit, in the highest and minimum permission speed limit, select to approach most step 5) the value of current safety speed limit as optimum speed limit under precondition, issue;
7) after completing the one-period detection of 5 minutes, control system detects traffic flow and state of weather in next cycle automatically, dynamically adjusts optimum speed limit issue according to real road traffic and weather condition.
When through street has the section of the different speed limits of multistage, every section is carried out respectively variable speed-limit control, each difference of controlling the speed limit in section need to keep within the specific limits, preventing that upstream and downstream speed limit gap is excessive causes disturbance to traffic flow, it is the stage of line traffic control shown in Fig. 3, the section that the present invention is controlled by through street final stage variable speed-limit starts, detect itself and adjacent upstream variable speed-limit and control speed limit poor in section, two adjacent variable speed-limits are controlled speed limit value difference between section and are less than or equal to 20km/h, otherwise reduce the speed limit in the section that speed limit is higher, this process until detect reaches first variable speed-limit of through street and to control section and finish, determine the optimum speed limit in each variable speed-limit control section.
For avoiding each section speed limit to change excessive, each optimum speed limit in variable speed-limit control section and the actual speed limit in current each section determined are compared, if each variable speed-limit is controlled the difference of the optimum speed limit in section and each actual speed limit in section and is greater than 10km/h, adjust, adjust speed limit change step at every turn and be no more than 10km/h;
Each section speed limit of determining is issued by trackside electronic variable advices plate, realized according to the through street variable speed-limit of arithmetic for real-time traffic flow and Weather information and controlling.
The traffic flow detecting when traffic flow and weather detecting device and state of weather become when good, close variable speed-limit regulation and control system, and through street speed limit reverts to initial default value, i.e. section Maximum speed limit value.
Determined under traffic flow running rate that rationally after speed limit, central computer sends the electronic variable advices plate that instruction regulates trackside, and new speed-limiting messages is distributed to driver.Simultaneously can issue corresponding information warning to driver, for example " the place ahead blocks up, and slows down and goes slowly " etc.
Because this method can be according to the reasonable speed limit of arithmetic for real-time traffic flow and Weather information dynamic adjustments through street, so this method has practical engineering application to be worth in through street traffic administration and controlling party mask.
Claims (4)
1. the through street variable speed-limiting control method based on arithmetic for real-time traffic flow and Weather information, it is characterized in that by control system, the speed limit of through street being controlled, control system comprises checkout equipment, backstage central computer and electronic intelligence plate, checkout equipment and electronic intelligence plate are arranged on through street, and variable-ratio control method is:
1) traffic flow and Weather information checkout equipment are set on through street, collect traffic flow and the Weather information of road to be controlled region, telecommunication flow information comprises speed, flow and occupation rate, Weather information comprises visibility, rainfall, pavement state and wind direction information, and accuracy of detection is to detect once for every 5 minutes;
2) parameters detecting is transferred in the central computer of backstage, judge current time, control system is only carried out speed limit control at the 7:00-19:00 of a day in the time period simultaneously, if not at this moment between in section, on electronic intelligence plate, show " keeping the speed of a motor vehicle, safety traffic ";
3) the arithmetic for real-time traffic flow situation detecting according to coil judges that whether traffic flow is in non-freestream conditions, when traffic flow parameters detection equipment Inspection to 5 minutes in each track traffic flow average density while being greater than 18pcu/km/lane, start variable speed-limit control system, otherwise electronic intelligence plate shows this through street acquiescence speed limit; In the sense cycle of 5 minutes traffic flow parameters detection equipment Inspection to 85% speed of a motor vehicle and the difference of current speed limit while being more than or equal to 5km/h, it is that current speed limit adds 10km/h that variable speed-limit control system regulates speed limit automatically; In sense cycle traffic flow parameters detection equipment Inspection to 85% speed of a motor vehicle and during current be less than or equal to-5km/h of speed limit value difference, it is that current speed limit subtracts 10km/h that variable speed-limit control system regulates speed limit automatically; When the absolute value of 85% speed of a motor vehicle detecting and the difference of current speed limit is less than 5km/h, do not regulate current speed limit in sense cycle;
4) meteorologic parameter detecting according to weather monitoring device judges whether to occur poor weather, thereby determine whether to start variable speed-limit, controls; The meteorologic parameter detecting is transferred in the central computer of backstage, according to each meteorologic parameter, automatically calculate optimum speed limit: according to road state of visibility, calculate visibility speed limit, according to rainfall situation, calculate rainfall speed limit, according to state computation icy on road, go out icing speed limit, according to wind direction situation, calculate wind-force speed limit, 4 speed limits that calculate compare, and get value that wherein speed limit is minimum as the meteorological safety speed-limit value of current through street;
5) get according to lower value in the speed limit calculating under traffic flow modes and poor weather as current safety speed limit;
6) by step 5) the current safety speed limit that calculates and through street is the highest and minimum permission speed limit compares, judge whether current safety speed limit needs to regulate; As current safety speed limit as described between the highest and minimum speed limit, with this speed limit, can be used as optimum speed limit under precondition and issue; If not between the highest described and minimum permission speed limit, in the highest and minimum permission speed limit, select to approach most step 5) the value of current safety speed limit as optimum speed limit under precondition, issue;
7) after completing the one-period detection of 5 minutes, control system detects traffic flow and state of weather in next cycle automatically, dynamically adjusts optimum speed limit issue according to real road traffic and weather condition.
2. the through street variable speed-limiting control method based on arithmetic for real-time traffic flow and Weather information according to claim 1, it is characterized in that having when through street the section of the different speed limits of multistage, every section is carried out respectively variable speed-limit control, the section of being controlled by through street final stage variable speed-limit starts, detect itself and adjacent upstream variable speed-limit and control speed limit poor in section, two adjacent variable speed-limits are controlled speed limit value difference between section and are less than or equal to 20km/h, otherwise reduce the speed limit in the section that speed limit is higher, this process until detect reaches first variable speed-limit of through street and to control section and finish, determine the optimum speed limit in each variable speed-limit control section.
3. the through street variable speed-limiting control method based on arithmetic for real-time traffic flow and Weather information according to claim 2, it is characterized in that each optimum speed limit in variable speed-limit control section and the actual speed limit in current each section determined to compare, if each variable speed-limit is controlled the difference of the optimum speed limit in section and each actual speed limit in section and is greater than 10km/h, adjust, adjust speed limit change step at every turn and be no more than 10km/h;
Each section speed limit of determining is issued by trackside electronic variable advices plate, realized according to the through street variable speed-limit of arithmetic for real-time traffic flow and Weather information and controlling.
4. the through street variable speed-limiting control method based on arithmetic for real-time traffic flow and Weather information according to claim 1, it is characterized in that the traffic flow that detects when traffic flow and weather detecting device and state of weather become when good, close variable speed-limit regulation and control system, through street speed limit reverts to initial default value, i.e. section Maximum speed limit value.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9995588B2 (en) | 2015-06-23 | 2018-06-12 | International Business Machines Corporation | Quantifying anomalous behavior by identifying anomalies at subtrajectories |
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