Lighting-up time is a legal driving term specifying the exact hours during which all motor vehicles operating on public roads must have their exterior running lights and headlights illuminated. The exact time varies by jurisdiction but is typically defined as a half-hour after sunset to a half-hour before sunrise.
Heard on the job
You got pulled over because you were driving with just your daytime running lights well past lighting-up time.
Related terms
DRL
Daytime running lights are forward-facing lamps that automatically illuminate when the engine is running.
Headlight fluid
A fictional automotive liquid used exclusively to prank gullible apprentices or customers.
Fog light
A forward-facing auxiliary light mounted low on the bumper to illuminate the road in poor visibility.