Aid on a misty night

• Low-visibility auto accessory
• Light used in murky conditions
• Wide-beamed shiner
• Headlight that provides strong beam for use in foggy weather
• It's often amber
• Bad weather auto accessory
• It's usually a yellow light
• Aid for dealing with pea soup

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

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