Abstract: Based on Negel-Schreken berg’s celllar automaton(CA) of traffic flow in one lane，taking the running situation which is oriented to freeway into consideration，making the gird more small，we do computer simulation．We make a observation of the running condition and consider the mean velocity and the delay of vehicles．The result of simulation indicated that the mean velocity and the delay of vehicles is similar to their fundamental tendency of variation．We can perceived from the time-space diagram, that the jam phase which is generated by this method is more gentle than the jam phase generated by the NS moda1．Because we lower the accelerated velocity to a more rational value and make the procedure of running mole continuous in the simulation，we can say，that our modal is approach the reality more than the NS modal．

Key words: cellular automaton, accelerated velocity, dispersed degree, jam phase, free phase

摘要： 在Nege1．Schreken berg单车道元胞自动机交通流模型的基础上，考虑面向高速公路的一维交通流运行状况，细化格点并进行计算机仿真。观测车辆的运行情况，并对车辆的平均速度和延误加以研究。仿真结果表明，车辆平均速度和延误符合它们的基本变化趋势。从仿真结果生成的时空图上我们可以看出，本文模型所生成的时空图所出现的阻塞相要比NS模型所出现的阻塞相平缓。且由于我们在仿真过程中使车辆加速度降低到合理的大小，让车辆的运行过程更加连续，因此本文模型比NS模型更加贴近现实。

关键词: 元胞自动机, 加速度, 离散程度, 阻塞相, 运动相