When passing another vehicle, when is it safe to return to your lane?
It is safe to return to your lane after passing another vehicle when you can clearly see the front bumper of the vehicle you passed in your rear-view mirror. This indicates that you have gained sufficient distance in front of the vehicle to safely merge back into your original lane without causing the vehicle you passed to need to slow down or adjust its position.
Cut Study Time from Hours to Minutes with the New York DMV “Cheat Sheet”