foglamp
/ˈfɑɡˌlæmp/
noun
- A bright, low-mounted light on a vehicle used to improve visibility in fog, mist, or heavy rain.
- Many modern cars come with a rear foglamp to help other drivers see you in poor weather.
- I turned on the foglamp when the highway became shrouded in thick fog.
- His car has a broken foglamp on the driver's side.