Aid for dealing with pea soup

• Light used in murky conditions
• One may be mounted close to a grille
• Headlight that provides strong beam for use in foggy weather
• Low-visibility auto accessory
• Bad weather auto accessory
• It's usually a yellow light
• It's often amber
• Bright light in inclement conditions

Wiktionary Word definitions in Wiktionary
n. A wide automotive lamp intended to increase visibility in poor weather conditions.

WordNet Word definitions in WordNet
n. headlight that provides strong beam for use in foggy weather