Define traffic density as, where is length of the road segment. Equation (1) can now be written in terms of density.

写定义交通密度，哪里是公路段的长度。方程(1)现在可以用密度来书。

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With the city's rapid development and gradual improvement of road infrastructure, urban traffic density increased year by year, the noise pollution of road traffic has become increasingly serious.

随着城市的飞速发展和道路基础设施的逐步改善，城市交通密度也逐年增加，交通噪声污染情况越来越严重。

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With the increase in the Numbers of vehicles, the density of traffic flow is also increased which results that vehicles move with non-uniform velocity on road such as accelerating and braking.

随着汽车的保有量迅速增加，车流密度也在不断提高，汽车在运行时经常处于加速超车、减速制动等变速运行工况。

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