在城市道路总长度一定，机动车平均行驶速度一定的情况下，希望城市道路网的通行能力越大越好。
For given total length of city roads and average speed of motor vehicles, maximizing the traffic capacity of the city road network is always desired.
几个小时的太阳光可以让这部不怎么漂亮的太阳能车以44公里每小时的平均速度行驶3小时。
A couple hours of sunlight will drive this not-so-pretty solar car for 3 hours at an average speed of 44 MPH.
不同城市的数据解析结果表明：不同城市车辆行驶状况存在一定的差异，其平均速度、怠速比例等均有所不同，但差异不大；
Result from different city show that vehicle driving condition belong to different city is diverse, and average speed and idle rate are not uniform, but their difference is small;
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