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Alternating red lamps and an amber preceding them.
Also known as: Wig-wag lights, Crossing lights
A level crossing shows a steady amber followed by alternating flashing reds. The amber means stop if you can, and the reds mean stop unconditionally — and a second train may follow, which is why the reds continue after one train has passed.
Warn of an approaching train with a steady amber lamp followed by two alternating flashing red lamps.
Contexts: Road signage
Continue to show red after a train has passed where a second is approaching, which is why the lights rather than the sight of the track govern.
Contexts: Road signage
Two round red lamps mounted side by side above a single round amber lamp on a post beside the track.