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In order to alleviate the traffic congestion induced by different rainfall intensities, a dynamic control method of variable speed limit in merging zones considering rainfall intensity heterogeneity was proposed. The impacts of capacity reduction and vehicle lane-changing probability on the traffic flow state were comprehensively considered, and the dynamic relationship between rainfall intensity heterogeneity and vehicle free-flow speed was explored. Then, a traffic flow prediction model was constructed based on the cell transmission model. Taking into account the total travel time and total turnover, the variable speed limit optimization model was constructed, considering the influence of rainfall intensity heterogeneity on the variable speed limit value solution, and the optimal variable speed limit dynamic control method was obtained by using the particle swarm algorithm. Simulation and analysis of the evolution of traffic flow under different speed limit control methods were conducted. The results show that when implementing the RVSL under light, moderate, and heavy rainfall, the objective function is reduced by 8.41%, 40.57%, and 32.91% compared with variable speed limit (VSL), and by 17.48%, 55.14% and 44.69% compared with fixed speed limit (FSL). The method can effectively reduce congestion and improve the efficiency of the highway.
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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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