How and When to Check Over Your Shoulder While Driving
Last reviewed: 2026 · Driviology Road Safety Education Team
Quick Answer
A shoulder check means briefly turning your head to look directly at the blind spot area beside and slightly behind your vehicle, and it is required before changing lanes, merging, or reversing.
Mirrors cover most of what is around your vehicle, but every car has a genuine blind spot that only a direct look over the shoulder can reveal.
When a Shoulder Check Is Required
A shoulder check is required before changing lanes, merging, pulling away from a parked position, and reversing — anywhere a blind spot could hide a vehicle, cyclist, or pedestrian.
How to Do It Correctly
Turn your head briefly and directly toward the blind spot, rather than just glancing with your eyes. It should take under a second, timed so you are not looking away from the road ahead for too long.
Why Mirrors Alone Are Not Enough
Even a well-adjusted mirror leaves a gap directly beside your vehicle. See our guide to blind spot mirrors for how add-on mirrors help, though a shoulder check is still the final, most reliable confirmation.