United States Permit Test Coach
Traffic signalsQuestion 108 of 223

A traffic signal is in flashing mode. What happens to its green lights?

  1. They flash with the yellow lights
  2. They stay dark
  3. They stay on as steady green
  4. They flash together with the red lights
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Correct answer: They stay dark

In flashing mode, green lights are dark. Only yellow or red lights flash. A single green arrow that shows a continuous movement is an exception.

Source: Manual on Uniform Traffic Control Devices for Streets and Highways (MUTCD), 11th Edition with Revision 1 (FHWA, December 2025), Section 4G.03 Flashing Operation – Signal Indications during Flashing Mode, page 752

Practice traffic signals

Questions last reviewed: 18 October 2026