随着改革开放政策的实施，交通运输迅猛发展，使一些公路铁路平交道口日趋繁忙，道口问题已经成为制约地区经济发展和威胁人民生命财产安全的焦点。 With the implementation of the policy of reform and opening up, the rapid development of transportation has made the crossroads of some highways and railroads increasingly busy. The problem of crossings has become the focus of restricting the economic development of the area and threatening the safety of people’s lives and property.