Patent ID: 8847748

Claim:
A sensor for actuating a vehicle warning signal, comprising: a housing; a magnetically activated switch located on an outside surface of the housing; and a wireless connection for connecting the switch to a warning signal device of the vehicle, the housing comprising a cavity located inside the housing, a first spring located inside the cavity, and a moveable magnetic weight element located inside the cavity adjacent the spring, wherein, in a first in-use condition the weight element is located in a first resting, non-activating position remote from said switch, wherein, in a second in-use condition, during a deceleration of the vehicle, the weight element moves to compress the first spring so that the weight element moves from the first position to a second activating position magnetically proximate the switch so that the switch is closed by magnetic interaction with the weight element, the closing of the switch causing the warning signal device to be activated to provide a deceleration warning to following vehicles, and wherein, in normal driving of the vehicle, the first spring keeps the weight element from moving to the second position proximate the switch.