<P> Red steady - burning rear lights , brighter than the rear position lamps , are activated when the driver applies the vehicle 's brakes . These are formally called stop lamps in technical standards and regulations and in the Vienna Convention on Road Traffic , though informally they are sometimes called `` brake lights '' . They are required to be fitted in multiples of two , symmetrically at the left and right edges of the rear of every vehicle . International UN regulations specify a range of acceptable intensity for a stop lamp of 60 to 185 candela . In North America where the UN regulations are not recognised , the acceptable range for a single - compartment stop lamp is 80 to 300 candela . </P>
<P> Red steady - burning rear lights , brighter than the rear position lamps , are activated when the driver applies the vehicle 's brakes . These are formally called stop lamps in technical standards and regulations and in the Vienna Convention on Road Traffic , though informally they are sometimes called `` brake lights '' . They are required to be fitted in multiples of two , symmetrically at the left and right edges of the rear of every vehicle . International UN regulations specify a range of acceptable intensity for a stop lamp of 60 to 185 candela . In North America where the UN regulations are not recognised , the acceptable range for a single - compartment stop lamp is 80 to 300 candela . </P>
what is a stop lamp on a car
what is a stop lamp on a car
brake lights
brake lights