This approach is quite effective to freeway ramp metering.
2
车辆在高速公路匝道提速到每小时60公里以上时，可直接驶入行车道。
When a vehicle has increased its speed to more than 60 kilometers per hour on the ramp of an expressway, it may directly enter the carriageway.
3
采用简单随机取样法，研究了高速公路匝道入口前的标志植物对驾驶员反应时间的影响。
By using the simple random-sampling method, this paper researches on the influence of the mark plants before the entry point of superhighway's ramp on the responding time of the driver.
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