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Portable roadway perimeter alarm

  • US 6,288,651 B1
  • Filed: 09/07/1999
  • Issued: 09/11/2001
  • Est. Priority Date: 06/30/1997
  • Status: Expired due to Fees
First Claim
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1. An apparatus for detecting a vehicle penetrating a perimeter of a roadway work area and providing a warning to workers in the work area comprising:

  • an impact sensor and transmitter unit having an electromechanical shock sensor electrically connected to a transmitter;

    the impact sensor and transmitter unit having a means for communication with a warning receiver and alarm unit;

    the impact sensor and transmitter unit mounted in a top of a safety cone; and

    a means for providing electrical energy to the impact sensor and transmitter unit.

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