What can I do to save my neck in a rear end collision?

Adjust the height of your vehicle's headrest. Specifically adjust the headrest up or down until the center of the headrest meets the center of the back of your head. This will help keep the head from pivoting over the top of the headrest in a rear end collision. Check to make sure that your head is not sitting too far in front of the headrest when you drive. The center of the back part of your head should be no further than the width of four fingers from the headrest. Keep your eyes on the road and your head straight while driving. Having your head or body turned during a collision can increase your chances of a significant injury.