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In order to mitigate the impact of traffic accidents on the operation efficiency of freeways，and improve the throughput capacity of the accident area，based on real-time information via vehicle-to-vehicle and vehicle-to-road，a cooperative lane change guidance strategy in freeway traffic accident areas was proposed with the safety potential field theory. Firstly，in view of various traffic accidents in different lanes in two-lane or multi-lane traffic of one-way，the guidance area of collaborative lane change was divided into four areas: accident protection area，guidance transition area，collaborative lane change guidance area and free lane change area. The guidance threshold of lane change was determined to update vehicle status. Furthermore，the safety potential field of traffic accidents was established，and the corresponding guidance strategies of vehicle cooperative lane change were proposed according to different scenarios. The calculation methods of the safe distance for vehicle lane change and the latest lane change position were given. Finally，based on simulation of urban mobility (SUMO) software，the simulation results were verified in various scenarios. The results show that in the two-lane of one-way scenario，the optimization effect is most obvious when the vehicle cooperative guidance rate is at 75%. In the multi-lane of one-way scenario，the optimization effect is most obvious when the guidance rate is at 50%. Meanwhile，through comparative analysis，it is found that the average speed of vehicles passing through the accident section is increased by up to 6.3% and the maximum vehicle delay is reduced by 14.6% after adopting the lane change guidance strategy.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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