A traffic conflict early warning method in the merge area of ​​expressway based on ramp control

Abstract

This patent discloses a traffic conflict early warning method in the merge area of ​​expressways based on ramp control, including: step 1, control the ramp signal light based on the real-time monitoring and comparison results of traffic flow, if the control result is a red light, turn to step 2 if the control The result is to turn to step 3 when the green light is displayed; step 2, judge whether the ramp vehicle has run a red light; step 3, judge the traffic conflict in the merge area based on PET and initially determine the severity level of the traffic conflict; step 4, for the existence of traffic conflict Carry out lane-changing detection to determine the final traffic conflict level; step 5, issue different warning information on the traffic warning display screen according to the different severity of traffic conflicts obtained in step 4. Through the above methods, the comprehensive protection, monitoring and early warning information release of traffic conflicts in the expressway merge area from source control to early warning release are realized, which is very helpful to greatly improve the safety of the expressway merge area.

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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