Why should you check over your shoulder before you change lanes in busy, slow-moving traffic?

Why should you check over your shoulder before you change lanes in busy, slow-moving traffic?

Mirrors do not cover blind spots

Correct answer

DVSA explanation

Before changing lanes, make sure there's a safe gap to move into. Looking over your shoulder allows you to check the area not covered by your mirrors, where a vehicle could be hidden from view. It also warns following drivers that you want to change lanes.

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