中文摘要：

以事故率最小为目标，以费用与速度限制为约束条件，建立可变限速控制优化模型，确定可变信息板数目与相应的可变限速值。采用交通波理论模型计算可变信息板设置间距，并利用Vissim仿真软件对模型进行验证。利用不同交通流量下的单向双车道6个收费窗口的高速公路，进一步模拟可变限速控制与静态限速控制。试验结果表明：在高速公路主线收费站排队广场前应设4块可变信息板，设置间距分别为1293、2695、4056m，仿真结果与交通波理论模型计算值的相对误差最小为3．9％，最大为9．5％；可变限速控制中，通过车辆数较静态限速控制增长51．82％，行程时间与排队长度分别平均缩短15．81％、18．98％，验证了本文设计体系的合理性。

英文摘要：

An optimization model of variable speed-limit control with the object of the least accident rate and the limitations of cost and speed was set up, in which the number of variable message signs and corresponding variable limit speeds were determined. The distances between variable message signs were computed by using the traffic wave model, and the optimization model was verified by using the simulation software Vissim. For different traffic flows, variable speed-limit control and static speed-limit control were simulated on the expressway with two- lanes and six toll windows in single direction. Analysis result shows that when 4 variable message signs with setting separation distances of 1 293, 2 695 and 4 056 m apart are installed before the queuing square of expressway mainline toll station, the minimum relative error between simulation result and calculated values of traffic wave model is 3.9~, and the maximum is 9.5%. Compared with static speed-limit control, passing vehicle number in variable speed-limit control rises by 51.82%, average travel time and queue length decrease by 15.81%and 18.98% respectively, which proves that the model is reasonable. 8 tabs, 3 figs, 14 refs.