I've wanted to do that for years. I have absolutely no idea how to do it though. You'd pretty much have to re-texture everything at least anyhow. Getting someone familiar with the area to help with bumps and grades in the road would probly help to.
Lol i parked the car in my swimming pool and plowed through my house...its ok my house is out of date on googlemaps anyway.
So if you wondering im fine, no one was hurt...theres just a car in the pool :S