提出一种基于图像处理的车辆长度自动提取方法。

To put forward an automatic extraction method based on image process in vehicle length.

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为避免桥梁共振，设计时应满足第一阶竖向自振频率大于车辆最大速度与车辆长度的比值。

To avoid the most dangerous resonance, the first vertical frequency of the bridge should be greater than the ratio of the maximum vehicle speed to the vehicle length in design.

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仿真研究表明本文提出的方法能够有效地缩小排队长度，从而达到减少车辆延误的目的。

Emulation study shows that the method put forward by the paper can shorten effectively the queueing length, so as to reach the purpose of decreasing vehicle delay.

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