Train tracks cross the road ahead. The circle is one of only two shapes reserved for a single meaning; round means rails.
Start looking and listening for a train now, not at the tracks. Slow enough that you could stop before the rails if lights flash or a train appears.
Round = wheels = train. The only round sign on the road is about the only vehicle that cannot stop for you.
Racing lowering gates or driving around them. A train at speed needs a mile or more to stop; the gate’s timing is not a suggestion.
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Q.A round yellow sign with a black X and the letters RR warns of:
A round yellow sign with an X and two R letters warns that a railroad crossing is ahead. Slow down and be ready to stop.
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Signs that live in the same family, or get confused with this one.
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