| 摘要 |
The portable roadway perimeter alarm has an impact sensor which may be a shock or pressure sensor that is connected to a transmitter. The impact sensor and transmitter unit is located around the perimeter of a roadway work area to detect vehicles penetrating the perimeter into the designated work area which vehicles may represent a hazard to work crews. The vehicle penetration event is transmitted to a warning receiver and alarm unit which may be placed in a pocket of a worker's vest or may be mounted on a work vehicle to sound an area alarm. The impact sensor and transmitter units are durable and operate in adverse environmental conditions.
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