In Canada a flashing yellow light at an intersection that would otherwise have traffic signals indicates that the traffic signals are malfunctioning. ![]() All-way red flashing lights can supplement all-way stop control, but all-way yellow signals are prohibited by United States regulations. ![]() Red lights supplement stop signs on the side road approaches. Yellow lights are displayed to the main road, to highlight the intersection and inform drivers of the need for caution. A single four-way flashing light showing only one color in each direction may be used at intersections where full three-color operation is not needed, but stop or yield signs alone have not had acceptable safety performance. ![]() This may be used when there is a malfunction with the signals, or late at night when there is little traffic. In the United States, Canada, Brazil and Australia, flashing yellow does not require traffic to stop, but drivers should exercise caution since opposing traffic may enter the intersection after stopping. In New Zealand and Hong Kong, paired red/red traffic lights are often installed outside fire and ambulance stations on major roads, which when activated by the station, flash alternatively (so that at any time one red light is always showing), the purpose being to cause traffic to stop for a set amount of time to allow emergency vehicles to exit their station safely. In the United States and Canada, a flashing red light is the equivalent of a stop sign. ![]()
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