铁路是国民经济的大动脉,道口是铁路与汽车、马车道路平面交叉,为保证列车和行人车马安全通行的必不可少的重要设施。随着国民经济的不断发展,铁路运量大幅度增长,列车密度加大,公路通过道口的行人车辆迅速增加,道口的安全已成为当前的严重问题。特别是近几年来铁路行车路外伤亡及撞车事故 Railway is the main artery of the national economy. Crossing is a crossroad of railroads with cars and carriageways. It is an indispensable and important facility for ensuring the safe passage of trains and pedestrians. With the continuous development of the national economy, railroad traffic has increased substantially, the density of trains has been increased, and the number of pedestrians passing the road crossings has increased rapidly. The crossing safety has become a serious problem nowadays. In particular, in recent years, railway traffic casualties and crashes