Abstract
In this paper, the data of video is extracted and processed, and the change process of road capacity during the accident is described by using the fuzzy comprehensive evaluation method. By means of cellular automata, the change of road capacity when different lanes are blocked is simulated, and the influence of different lanes on road capacity is analyzed. Then the formula of vehicle queue length based on mathematical relation is established.
Highlights
In this paper, the data of video is extracted and processed, and the change process of road capacity during the accident is described by using the fuzzy comprehensive evaluation method
Road capacity refers to the capacity of road facilities to ease traffic flow.That is, the capacity of road facilities to pass traffic flow points within a certain period of time and under normal road, traffic, control and operation quality requirements.Capacity is generally expressed in terms of veh/h and pcu/h, and the basic unit is pcu/h/ln
When the actual traffic volume on the road is less than its capacity, the driving vehicles on the road are in a free driving state, with higher speed and less traffic density.When the actual traffic volume on the road is close to or equal to its capacity, the vehicles on the road are tracked with the speed approaching uniform, resulting in the phenomenon of fleet driving, and the headway distribution is close to the average value.When the actual traffic volume on the road exceeds its capacity, the density of vehicles on the road increases and the speed decreases, resulting in traffic congestion and obstruction
Summary
Road capacity refers to the capacity of road facilities to ease traffic flow.That is, the capacity of road facilities to pass traffic flow points within a certain period of time and under normal road, traffic, control and operation quality requirements.Capacity is generally expressed in terms of veh/h (vehicle/hour) and pcu/h (equivalent standard small passenger car/hour), and the basic unit is pcu/h/ln (equivalent standard small passenger car/hour/lane). Lane occupation refers to the phenomenon that the capacity of a lane or road cross section decreases in unit time due to traffic accident, roadside parking, occupation and other factors. As the urban road has the characteristics of high traffic density and strong continuity, one lane is occupied, which may reduce the capacity of all lanes of the road section. When the actual traffic volume on the road is less than its capacity, the driving vehicles on the road are in a free driving state, with higher speed and less traffic density.When the actual traffic volume on the road is close to or equal to its capacity, the vehicles on the road are tracked with the speed approaching uniform, resulting in the phenomenon of fleet driving, and the headway distribution is close to the average value.When the actual traffic volume on the road exceeds its capacity, the density of vehicles on the road increases and the speed decreases, resulting in traffic congestion and obstruction. The main factors affecting road capacity are road conditions, traffic conditions and external environment
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