路段上车辆的进入和离去对交通流的影响

运用差分法对连续交通流模型进行求解，对数值解取不同的初始值，分别求出不同初始值时，路段上无车辆的进入和离去、只有车辆的进入和只有车辆的离去3种情况下的密度、速度及流量，并作出相应的k-t，u—t，q-t图。得出了当密度较小时，车辆的进入和离去对交通流的影响不大；当密度接近最佳密度时，车辆的进入会大大降低路段上的车流量，...

Changes of Traffic Flow by Traffic Entering and Leaving

Using the finite difference method, we got different initial values to solve the continuous traffic flow. In terms of three respects of no vehicles on road, only vehicles entering and vehicles leaving, we calculated density, velocity and flow, and made corresponding k-t, u-t, q-t figure. When density became lesser, vehicles entering and leaving had few changes to traffic flow. When density got close to the best density, vehicles would make traffic flow low. When density was equal to the best density, vehicle entering the road would drop the flow from 1 650 veh/h to 997 veh/h. As far as different initial values were concerned, vehicle leaving would only increase the speed and re- duce the density, without any impact on traffic capacity.