Round signs are used for:

Do Not Enter signs.
No Passing Zone signs.
Roundabout signs.
Railroad Crossing Advance Warning signs.
Explanation

There is only one type of round (circular) traffic sign, and it is used to warn drivers of an upcoming railroad crossing. These Railroad Crossing Advance Warning signs are yellow with black RXR symbols and provide advance notice to help you slow down and approach the crossing with caution. Always be prepared to stop if necessary and watch for oncoming trains.

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