Hazard warning lights should be used mainly when…

En español: Las luces de emergencia (warning) deben utilizarse principalmente cuando…

A You double-park briefly
B Warn of a hazard or unintended stop Correct answer
C It is night on a motorway
D You are refuelling

Why this is the correct answer

Hazard lights warn other drivers of dangerous situations: breakdown, sudden traffic jam, accident, etc.

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