Stop lamps (brake lamps)
Red steady-burning rear lights, brighter than the rear position lamps, are activated when the driver applies the vehicle’s brakes. These are called brake lights or stop lamps. They are required to be fitted in multiples of two, symmetrically at the left and right edges of the rear of every vehicle. Outside North America, the range of acceptable intensity for a brake lamp containing one light source (e.g. bulb) is 60 to 185 candelas. In North America, the acceptable range for a single-compartment brake lamp is 80 to 300 candelas.