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Round yellow sign with a black X and the letters RR

Grade Crossing Advance Warning sign

W10-1 is a round advance warning of a highway-rail crossing.

MUTCD code W10-1 · Warning sign · Source: MUTCD 11th Edition, Section 8B.06

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What does this round yellow sign warn you about?

Round yellow sign with a black X and the letters RR
  • An airport road crossing
  • A roundabout just ahead
  • A railroad crossing ahead
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A railroad crossing ahead

This round sign warns of a railroad crossing ahead. Slow down, look and listen for trains.

Source: Manual on Uniform Traffic Control Devices, 11th Edition, Section 8B.06; Arizona Driver License Manual and Customer Service Guide, Section 3, Roadway and Vehicle Knowledge: Railroad Warning Sign (p. 42); Tennessee Comprehensive Driver License Manual, Section B, Chapter 3, Traffic Signs and Signals: Round Shape - Railroad Ahead (p. 36)

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DMV Decoded is an independent guide, not a government agency. Check your state's driver handbook for the signs on its test.