A highway entrance detecting 
control system comprises a PLC controller, an automatic card dispensing motorcycle lane automatic monitoring 
control unit, an ETC lane automatic monitoring 
control unit, and a green channel specialized lane automatic monitoring 
control unit. The automatic card dispensing motorcycle lane automatic monitoring control unit is composed of a height limiting detecting mechanism, a width limiting detecting mechanism, a length limiting detecting mechanism, a remote information 
receiver, a digital alarm, an electric guardrail and a sound-and-light alarm. The ETC lane automatic monitoring control unit is composed of height 
measuring equipment, an electric guardrail and a sound-and-light alarm. The green channel specialized lane automatic monitoring control unit comprisesheight 
measuring equipment and a sound-and-light alarm. According to the highway entrance detecting 
control system, through integrating various photoelectric detections and highway control, 
mechanization and 
automation in highway entrance controlling are realized, and highway safety 
management efficiency is improved. The highway entrance detecting 
control system has advantages of simple structure, high 
automation degree, high operation stability, and accurate and reliable detection.