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Automotive glossary

Side Marker Lights

Side marker lights mark the sides of a vehicle so its length can be seen at night.

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What is Side Marker Lights?

They are amber at the front and sides and sometimes red at the rear. Long vehicles and trailers require them. Many cars sold in North America have them. They can be combined with the turn signals on some cars. Regulations decide where they are required and what colour they must be. On long trailers and vans they help other drivers judge the vehicle length in the dark. Many are LED units sealed against water.

How it works

They light together with the sidelights.

Why it matters for your car

Check them after bodywork repairs. Damaged seals let water in.

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