Expressway confluence area traffic conflict early warning method based on ramp control

Abstract

The invention discloses an expressway confluence area traffic conflict early warning method based on ramp control, which comprises the following steps: step 1, controlling ramp signal lamps based on atraffic flow real-time monitoring and comparison result, if the control result is that a red light is displayed, turning to step 2, and if the control result is that a green light is displayed, turning to step 3; step 2, judging whether there is a ramp vehicle running the red light or not; step 3, judging a traffic conflict in a confluence area based on PET and preliminarily determining the severity level of the traffic conflict; step 4, conducting lane changing detection on main road vehicles with traffic conflicts, and determining the final traffic conflict level; and step 5, issuing different early warning information on a traffic early warning display screen according to the different traffic conflict severity degrees obtained in the step 4. By means of the method, comprehensive protection, monitoring and early warning information release for traffic conflicts in the expressway confluence area from source control to early warning release are achieved, and the safety of the expressway confluence area can be greatly improved.

Description

technical field [0001] The invention relates to the field of intelligent traffic control and early warning, and in particular relates to a traffic conflict early warning method in a highway merge area based on ramp control. Background technique [0002] With the development of my country's economy, the number of private cars continues to grow, and highways continue to be built. More and more people choose to drive private cars to their destinations via highways for high-speed convenience. However, the capacity of highways is limited after all. It has become a trend that highways are overcrowded during the period. The increase of expressway traffic flow means that the number of vehicles passing through the expressway merge area is increasing, and it also means that the possibility of traffic conflicts in the expressway merge area is also increasing. higher requirements. [0003] The existing merging area control mainly includes early merging control strategy and late merging...

AI Technical Summary

Problems solved by technology

However, the existing early-merge control strategies or late-merge control strategies are not applicable to the existing expressways in my country, because the normal conditions of expressways in my country do not allow lanes to be closed arbitrarily, and even if lanes are allowed to be closed, it may cause secondary traffic jams in the merge area. Sub-crowding increases the potential unsafety of the merge area

[0004] Existing judgments on potential traffic conflicts in expressway merge areas use TTC to judge the safety time. TTC assumes that both parties to the conflict do not take any protective measures and continue to maintain the original speed and direction of travel. Expected time. This method is based on the speed and heading of the vehicle at the current moment, and does not take into account the acceleration of the vehicle, resulting in a large judgment error. In the TTC model, it is difficult to obtain the instantaneous speed of the vehicle conflict, and the smaller the TTC value, and does not mean an accident

[0005] In addition, the existing early warnings for potential traffic conflicts in expressway merge areas do not take into account the fact that vehicles in expressway merge areas change lanes more frequently than other road sections. It is very likely to cause hysteresis or even errors in early warning information

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