A PERIMETER BREACH ALARM SYSTEM & A LANTERN ADAPTED FOR USE IN SUCH A SYSTEM

摘要

Traffic cones are frequently used to close off and redirect traffic from roadways. In order that the cones perimeters are visible at night, they may be provided with lanterns. Although cones with lanterns are conspicuous, they provide an ineffective physical obstruction to a vehicle travelling at speed. This has prompted the development of various systems to warn road maintenance workers when a vehicle breaches a cone perimeter. The invention is directed to such as system in which a sensor unit to detect an impact and to generate a wireless alert signal is provided in the casing of a lantern, and are powered from the battery used to power the light source of the lantern. The sensor unit may be is mounted onto the terminals of the battery and held within the cavity of the lantern housing used to house the battery. In this way the sensor unit can incorporated with the lantern without any modification to the design of the lantern.