Practice question

What type of light signal must be used at night by flaggers?

  1. A flashlight, lantern, or other lighted signal that displays a red warning light.
  2. A blue flashing beacon.
  3. A green LED palm light.
  4. A white strobe only.

Answer: A — A flashlight, lantern, or other lighted signal that displays a red warning light.

At night, flaggers must use a lighted signal that displays a red warning light. The red signal is the standard, universally understood cue for drivers to stop or proceed with caution, which is crucial when visibility is limited after dark. Other signals do not meet this standard: blue flashing beacons are typically for emergency or service vehicles, not flaggers; a green LED palm light isn’t a recognized traffic-control signal for flaggers and can be confusing; and a white strobe alone lacks the required red color to clearly communicate the stop/caution instruction.

Practice more: FDOT Flagging and Traffic Control Safety Training Practice Test →