I always check my mirrors. You never know what could be behind you. A few weeks ago a guy from Maine was riding through a town just north of me. He was doing 55 mph(estimated by police) when a car hit him from the rear. The bike was pushed over a hundred feet. The rider fell off and was run over by the car. The car kept going with a flat tire from running over the bike and the rider. The car was tracked to the owners house and they were arrested. The car occupants were huffing prior to the accident. Just shows that you need to be aware even while you are at cruising speed. I hope they fry those little f#$%ers!!!!!!!!!!!!!!!!!!