Question Three of the most important times to check for traffic behind you are before: Answers Backing, making a sharp turn, or crossing an intersection. Backing, changing lanes, or slowing down quickly. Changing lanes, crossing intersections, or slowing down quickly. Explanation It is important to check behind you before changing lanes, reducing your speed, backing up, or driving down a long or steep hill. Pass your DMV Written Test with flying colors Take me to the cheat sheet California This questions appears in the following tests: California Practice Test 31 California Practice Test 21