雾天高速公路车辆跟驰安全分析与控制策略

doi:10.13229/j.cnki.jdxbgxb.20230634

Abstract

Abstract:

This paper studies the freeway car-following safety in foggy weather. Then a control strategy for freeway car-following safety in foggy weather is proposed based on vehicle-to-vehicle（V2V） communications. Firstly， a foggy car-following model was selected to describe the car-following behavior in foggy weather. Numerical simulation was designed to analyze the influence of different foggy scenes and speed limit conditions on the risk of rear-end collision. Then we conducted sensitivity analyses on the collision time threshold TTC*， the initial speed v of the fleet and the distance L between the lead vehicle and the accident point when the lead vehicle just observed the accident point. Finally， considering the influence of speed difference between the vehicle and preceding vehicle on car-following behavior， a car-following safety control strategy was proposed based on foggy V2V conditions. The results show that the speed limit values of 60 km/h and 100 km/h will lead to the maximum risk of rear-end collision under light fog and heavy fog conditions， respectively. The light fog has the minimum risk of rear-end collision when 40 km/h and 80 km/h are selected as the speed limit value. The heavy fog has the minimum risk of rear-end collision when 60 km/h is selected as the speed limit value. The risk of rear-end collision is positively correlated with the initial speed v of the fleet and collision time threshold TTC*， and negatively correlated with the distance L between the lead vehicle and the accident point when the lead vehicle just observed the accident point. The proposed control strategy can effectively reduce the risk of rear-end collision and improve the car-following safety in foggy weather. Under the confidence level of 95%， the risk of rear-end collision was significantly reduced. The risk of rear-end collision could be reduced by 36.70%~45.14% under different foggy scenes and speed limit conditions.

Key words: engineering of communication and transportation system, traffic safety, car-following model, foggy weather, control strategy

CLC Number:

U491

Yan-yan QIN,Teng-fei XIAO,Qin-zhong LUO,Bao-jie WANG. Car-following safety analysis and control strategy for foggy freeway[J].Journal of Jilin University(Engineering and Technology Edition), 2025, 55(4): 1241-1249.

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雾天浓度	限速/（km·h^-1）	a_n /（m·s^-2）	b_n /（m·s^-2）	b_n_-1/（m·s^-2）	T_n /s	d/m
轻雾（能见度150 m）	40	1.354	-3.718	-3.528	0.947	6.567
	60	1.792	-3.539	-3.893	1.150	5.938
	80	2.574	-3.940	-2.958	1.493	6.238
	100	2.809	-3.694	-2.867	1.636	6.153
浓雾（能见度60 m）	40	2.256	-3.557	-3.637	0.943	6.682
	60	2.296	-3.460	-3.644	1.064	7.188
	80	2.530	-2.967	-2.907	1.176	6.290
	100	3.330	-3.719	-3.210	1.504	5.721

雾天浓度	限速/（km·h^-1）	TET	TIT
轻雾	40	19.72	10.93
	60	90.29	52.66
	80	18.29	11.48
	100	21.42	13.73
浓雾	40	22.74	11.75
	60	13.75	6.36
	80	27.87	15.67
	100	51.03	36.27

雾天浓度	限速/（km·h^-1）	TET
雾天浓度	限速/（km·h^-1）	TTC^*=2 s	TTC^*=2.5 s	TTC^*=3 s	TTC^*=3.5 s	TTC^*=4 s
轻雾	40	3.12	9.76	19.72	34.65	53.95
	60	15.84	44.40	90.29	119.20	141.23
	80	4.21	10.27	18.29	28.95	41.97
	100	5.00	11.87	21.42	33.79	49.16
浓雾	40	2.99	10.15	22.74	41.78	69.36
	60	1.19	5.65	13.75	26.76	45.90
	80	4.90	13.80	27.87	48.77	77.05
	100	14.22	29.17	51.03	79.34	115.49

雾天浓度	限速/（km·h^-1）	TIT
雾天浓度	限速/（km·h^-1）	TTC^*=2 s	TTC^*=2.5 s	TTC^*=3 s	TTC^*=3.5 s	TTC^*=4 s
轻雾	40	0.65	3.71	10.93	24.36	46.33
	60	4.59	18.80	52.66	105.46	170.74
	80	1.08	4.50	11.48	23.13	40.69
	100	1.40	5.53	13.73	27.40	48.03
浓雾	40	0.58	3.73	11.75	27.57	54.95
	60	0.13	1.67	6.36	16.27	34.14
	80	1.09	5.50	15.67	34.54	65.63
	100	5.89	16.58	36.27	68.29	116.28

Car-following safety analysis and control strategy for foggy freeway

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