| 摘要 |
The system for remote control of retractable, ground-based vehicle barriers increases control of the emergency lane of the road by mounting ground signboards in the emergency lane to prevent any vehicle to pass through this lane and so the police vehicle or the ambulance can easily and quickly approach the site of accident through the emergency lane. The signboards include a U-shaped frame permanently mounted in the emergency lane and a panel pivotally attached to the frame. Servo motors are provided to rotate the panels between a vertical position providing a barrier to traffic and a horizontal position permitting an emergency response vehicle to travel through the emergency lane. The emergency response vehicle is provided with a remote control unit having a short-range transmitter that transmits a trigger signal that is received by a unit at the barrier sign to activate a motor controller to lower the sign. |
