Abstract: A hazard warning device for highway use includes a set of self-contained, micro-processor controlled studs, each stud incorporating a rechargeable battery and/or capacitor, the studs being capable, when deployed and activated, of emitting a hazard warning light, and, when not deployed, housed in a charger case stored and transported in a road vehicle and rechargeable from the vehicle's electric system, each stud incorporating contact pins for recharging.

Abstract: A hazard warning device, particularly for highway use, comprising a self-contained stud (1) incorporating at least one rechargeable battery and/or capacitor to power, when deployed, at least one hazard warning light (7), and control circuitry to control inter alia activation of the light (7). In one embodiment, the hazard warning device comprises a set of self-contained, micro-processor controlled studs (1) being capable, when deployed and activated, of emitting a flashing or constant hazard warning light, and adapted, when not deployed, to be housed in a charger case (11) that is stored and transported in a vehicle, with said battery and/or capacitor being recharged from the electrical system of the vehicle.