| Answer | Crossword Clue |
|---|---|
| SIRENES | Fog signal devices. |
| SIRENE | Fog signal. |
| megafog | a fog signal |
| megafogs | MEGAFOG, a fog signal |
| diaphone | a fog signal similar to a siren but producing a blast of two tones |
| SIRENES | Signal devices: Var. |
| BEEPERS | Air signal devices |
