Practice question

When wiring a flashing yellow arrow (FYA) overlap, the protected-left green and the FYA permissive yellow are typically driven by:

  1. The same load-switch channel
  2. Two separate load-switch channels (one for protected green/yellow/red, one for the FYA permissive yellow output)
  3. The MMU output relay
  4. A dedicated FYA relay built into the controller power supply

Answer: B — Two separate load-switch channels (one for protected green/yellow/red, one for the FYA permissive yellow output)

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