Related Clues:
- Word of caution
- ''Breakdown ahead'' warning
- Jabberwock advice
- ''Accident ahead'' indicator
- Start of a sign on a gate
- S O S signal
- Breakdown alert
- Attention-getting light
- Disabled vehicle alert
- Roadside warning
- Airborne signal
- Emergency device
- Spooky warning
- Accident indicator
- ''Cave'' in ancient Rome