雾天交通限速计算

为获得驾驶者遇到突发障碍物时制动特点的数据,在专业试车场地通过专用设备进行了试验.试验表明,制动反应时间为2.0 s(良好路况)或2.5 s(一般路况)可满足大多数驾驶者的需要.将车辆的制动过程简化为制动力增长阶段和持续制动阶段,给出了雾天限制车速的计算方法.各种能见度下对应的限速计算值和推荐值为雾天的交通限速控制措施提供了理论依据.推荐值与美国犹他洲相应规范的推荐值接近,与我国<道路交通安全法>中对低能见度时的车辆限速规定相比偏大.

Calculation of Speed Limit on Foggy Days

Experiments were conducted with professional equipments at motordrome to acquire the braking characteristic data of drivers who meet unexpected obstacles. The results show that a braking-reaction time of 2. 0 s in good road traffic conditions and 2.5 s in general road traffic conditions satisfy most drivers' demands. A calculation method of speed limit on foggy days was then developed by simplifying the braking process into the braking-force growing phase and the continuous braking phase, to calculate the speed limits in different visibility conditions. The calculated values and recommended values of speed limits for various visibilities provide a theoretical basis for controlling the speed limit of vehicles on foggy days. The recommended values are approximately equal to those specified in the speed limit guides of Utah, USA and bigger than those specified in the Law of the People' s Republic of China on Road Traffic Safety.