Hazard flashers – Emergency warning devices
International regulations require vehicles to be equipped with a control which, when activated, flashes the left and right directional signals, front and rear, all at the same time and in phase. This function is meant to be used to indicate a hazard such as a vehicle stopped in or alongside moving traffic, a disabled vehicle, an exceptionally slow-moving vehicle (including, for example, trucks climbing steep grades on Canadian expressways), a vehicle participating in a motorcade, or the presence of stopped/slow moving traffic ahead on a high speed road. Operation of the hazard flashers must be from a control independent of the turn signal control, and audiovisual telltale must be provided to the driver. In vehicles with a separate left and right green turn signal indicator on the dashboard, both left and right indicators may flash to provide visual indication of the hazard flashers’ operation. In vehicles with a single green turn signal indicator on the dashboard, a separate red indicator light must be provided for hazard flasher indication.