文中实验是在河北省唐山市唐港高速公路唐山收费站入口车道完成,车辆行驶速度在60Km/h以下,车辆行驶相对缓慢。
The experiments were carried out at entrance of toll lane at TangShan toll-gate in TangShan city in HeBei province . Vehicles run at speed of below 60 Km / h.