Light used in murky conditions

• One may be mounted close to a grille
• Aid for dealing with pea soup
• Wide-beamed shiner
• It's often amber
• Headlight that provides strong beam for use in foggy weather
• It's usually a yellow light
• Bright light in inclement conditions
• Aid on a misty night

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