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本文给出一种一次性综合模拟多车道多车种随机车流噪声的计算机模拟的简化方法，详细推导了用于预报部分车辆成组行驶的随机车流噪声的数学模型（M_2模型）的车头时距分布函数、概率密度函数和平均时距表达式及相应的随机数变换式。文中还给出了计算机程序框图，并将M_2模型模拟结果与据车头时距为负指数分布的M_1模型的模拟结果作了比较。计算机程序是根据我国交通噪声测量统计方法编制的，只要在程序中输入车流量、车流成份，测点离各车道及等效车道的距离诸参量，计算机便能自动输出L_10、L_50、L_eq等声级值，预报值与实测值良好一致。
In this paper, a simplified method of computer simulation for one-time comprehensive simulation of random traffic flow noise of multi-lane and multi-vehicles is presented. The headway of the mathematical model (M_2 model) used to forecast the random traffic flow noise of some vehicles traveling in groups is deduced in detail. Distribution function, probability density function and average time span expression and the corresponding random number transform. A computer program block diagram is also given in this paper. The simulation results of M_2 model are compared with those of M_1 model with negative exponential distribution of headway time. Computer program is based on China’s traffic noise measurement and statistics methods, as long as the process of input traffic, traffic components, measuring points from the lane and the equivalent lane distance parameters, the computer will automatically output L_10, L_50, L_eq and other sounds Level value, forecast value and the measured value is in good agreement.