United States Permit Test Coach
Railroad crossingsQuestion 202 of 223

How do the two red lights flash at a railroad crossing?

  1. They flash at the same time.
  2. They flash only on the left side.
  3. They flash one after the other, in turn.
  4. They stay on and do not flash.
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Correct answer: They flash one after the other, in turn.

The two red lights at a railroad crossing flash alternately. One light is on while the other is off.

Source: Manual on Uniform Traffic Control Devices for Streets and Highways (MUTCD), 11th Edition with Revision 1 (FHWA, December 2025), Section 8D.02 Flashing-Light Signals, page 1059

Practice railroad crossings

Questions last reviewed: 18 October 2026