Abstract: 4.5 km of the haulage ways in a mine is in the mountainous area,the road conditions are complex,full of contours and narrow lanes that only allow for one-way traffic,in which situation the coming vehicles need to back off to avoid the confrontation.This seriously influences traffic efficiency and causes safety risks.In order for early warnings for narrow lane traffic,an early warning system for two-way traffic in narrow haulage ways is designed.And in the study of safe traffic deeds in mine roads,the wireless transmission of signals is controlled by vehicle detection and direction judgment while reliable detection,control,calculation and transmitters are selected.Based on the detection,the signals are compared by PLC controllers to reach the goal of safe traffic and maximize the safety of vehicle traffic.In the application of the system,the traffic safety is effectively guarateed and the safety risk that one-way traffic can’t avoid confrontations in advance is solved.