No, you're no unreasonable at all to want to move! It's very natural. I wouldn't actually do so in a hurry, though. I'm quite certain that you're just experiencing a random projection of the accident to the road, and it will in time be "over-written" by other memories and feelings.
Similar story: after my brother died a few years ago while I was away from home, I had to spend hours trying to get hold of my mother on my mobile phone, to tell her. The sight of the phone made me feel physically sick after a few hours, and I dearly wanted to throw the awful thing away. I ordered a new one, but before it arrived I had received sympathy messages from lots of friends on it, and it was back to just being a phone. I still have it.
Hope you do have many overlayers of good and pleasant experiences to balance out this one terrifying one in time!
Winter riding is much less about badassery and much more about bundle-uppery. - malkin
1995 Kona Cinder Cone commuterFrankenbike/Selle Italia SLR Lady Gel Flow
2008 white Nakamura Summit Custom mtb/Terry Falcon X
2000 Schwinn Fastback Comp road bike/Specialized Jett