基于排队论的城市路网模式选择

Research on Urban Road Network Mode Based on Queuing Theory

假设相同道路用地面积下的4种路网模式,基于交通工程学的基础理论之一,排队论,分别计算并讨论以下两种情形4种路网模式中车流沿横向或纵向行驶产生的总耗时变化趋势:到达率相同,道路用地面积率持续变化;道路用地面积率相同,到达率持续变化.并对总耗时和趋势变化曲线进行比较、分析.结果表明:车流到达率不高,即交通量不大的情况下,低密度、红线较宽的路网模式(模式1)具备一定优势;当交通量增多和出现拥堵时,高密度的单行线路网系统(模式4)更具优势.关键结论可直接指导规划实践.

Based on the basic queuing theory in traffic engineering and the assumption that four kinds of road network modes under the same road land area ratio,a calculation was done on one vehicle＇s total time-consuming changing trends along horizontal or vertical roads in four kinds of road network modes under the following two situations：keeping the same traffic arriving rate,changing road land area ratio;keeping the same road land area ratio,changing arriving rate.And then,total time-consuming and curves changing trends were compared and analyzed.Results show that low density and wide road network system（Mode 1） has some advantage in case of lower traffic arriving rate;When the traffic volume increases and leads to light congestion,the high density and one-way street network system（Mode 4） is the best.Key conclusions can directly guide road network planning.