But again , it ' s long been accepted that on the lap the safety car is coming in , the leader is the safety car and is entitled to do whatever he feels he needs to ? and it ' s up to the rest of the field to keep from driving into him 但是这种行为还是早已被接受的.在安全车进站的那圈,头车变成安全车,并有权做出任何它需要去做的行动.而它身后的赛车们只能自己去避免与前车相撞
During the restricted hours in designated areas , the use of specified powered mechanical equipment for example , hand - held breakers and dump truck and or the carrying out of the prescribed construction activities for example , erection or dismantling of formwork and hammering is subject to more stringent control 于限制时间内，在指定范围使用指明机动设备例如手提破碎机及泥头车及或进行指明建筑工程例如搭建或拆除模壳或锤打均须受到更严格的管制。
Among the six models , model a and model b can be used to study the vehicle stability and curve negotiation under different track situations . model c and model d can be used to carry out the stability , dynamic curving behavior and ride comfort of the high - speed passenger car . model e and model f are three - dimension train dynamic models which consist of three cars ( head car , intermediate car and tail car ) 所建立的6种动力学模型中，模型a和模型b可用于研究不同轨道条件下车辆的运动稳定性及动态曲线通过性能；模型c和模型d可以用来研究车辆的运动稳定性、动态曲线通过性能及运行平稳性；模型e和模型f是列车系统动力学分析模型，都是由三节车组成的列车单元，三车列车模型作为一个最小的列车单元，包含了头车、中间车和尾车，已能够反映整个列车的动力学特性。
