Urban road speed limiting indication system based on time, traffic flow and weather and control method

Abstract

The invention discloses an urban road speed limiting indication system based on time, traffic flow and weather, and a control method. A central controller confirms a road initial limited speed of each time period according to a clock device, and displays limited speed values varying in real time on an LED (Light-emitting Diode) indication board in comparison with a self-set adjustment parameter according to the speed, the flow rate of the traffic flow and weather data of a surrounding environment provided by traffic flow detectors and image sensors. The indication system and the control method have the advantages that due to the grading of the time periods, traffic flow states and weather, influences of time variation, light, the traffic flow states, and the weather on the limiting speed are designed in detail; adjustment procedures of the initial limited speed are defined, and compared with the practically measured traffic flow of 85 minute bit rate; the theoretical limited speed is further adjusted; then the continuity of states of running vehicles on an adjacent road is taken into consideration; the limited speed of the adjacent road is uniformly coordinated by taking the speed of 20km / h as an adjustment threshold; and the safety and the efficiency are improved.

Description

technical field [0001] The invention belongs to the field of intelligent traffic control, in particular to an urban road speed limit indication system and control method based on time, traffic flow and weather. Background technique [0002] Vehicle speed has a profound impact on the efficiency and safety of urban traffic. If the speed of the vehicle is too high, the driver's vision will be narrowed, the distance of parking and deceleration will increase, and the danger will increase; and the speed is too high, and various forms of traffic accidents such as sideslip, rollover, and rear-end collision will easily occur. However, if the vehicle speed is too low, there will be resource and environmental problems such as low traffic operation efficiency, sharp increase in fuel consumption and exhaust gas. Therefore, controlling the speed of vehicles within a reasonable range is of great significance to the reasonable operation of traffic flow. [0003] The indication value of th...

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Problems solved by technology

But the scheme of this control method is too simple, mainly reflected in the following eight points: the one, the meteorological monitoring detector that above-mentioned patent adopts can only detect the change of weather, but the situation of index such as but not easy to reflect road slipperiness; When there is no bad weather and the traffic condition is stable, the sight distance in a day will also change with the visibility due to the change of natural light, which will lead to the adjustment of the speed limit; the third is only for the speed limit method of the expressway. At present, various traffic problems frequently occur on urban roads because there is no reasonable speed limit, but the achievements of the above-mentioned patents cannot be directly applied to urban roads; Speed ​​limit before 7, while many cities still have more traffic between 5:00 to 7:00 in the morning and 7:00 to 10:00 in the evening, and traffic between 10:00 in the evening and 5:00 in the morning There should also be an appropriate control speed; fifth, there is no key research on the evening time period when accidents occur frequently, which may easily lead to design mistakes; sixth, the influence of vehicle type on driving speed is not considered. In fact, the driving speed of large vehicles is significantly lower than that of The speed of the car; Seventh, the speed limit value under the influence of weather and traffic flow is controlled separately and the minimum value is taken. It may be unreasonable to have the same speed limit under the same bad weather but different traffic flow conditions; Eighth. All kinds of severe weather often do not appear alone, and the influence of multiple weather superpositions should be considered

[0005] In summary, although the Chinese patent CN102542831 has proposed a reasonable design for the design of variable speed signs, due to the shortcomings of the design results, urban roads are facing greater traffic pressure and urban roads There are obvious differences from expressways, and the above-mentioned patents cannot and are not suitable for direct transplantation and application to urban roads

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