Based on the mirror views and blind spots shown, what should you do before you change lanes?
Correct answer: Signal, check your mirrors, and glance over your shoulder.
Answer options
ASignal and glance over your shoulder, without using the mirrors
BSignal and check your mirrors, with no shoulder check
CSignal, check your mirrors, and glance over your shoulder Correct
Why
Mirrors cannot show the red zones beside and just behind the car, so a quick look over the shoulder is the only way to spot a vehicle hidden there. Signaling warns other drivers, the mirrors show traffic behind you, and the shoulder check covers the blind spot, so all three steps are needed.