Well, a bit of a spoiler, but if you get to the end of the map your car is literally measured on a giant scale (meassuring how many items you lost, in weight!)
Yeah I rewrote the AI code literally on the last day because it was not working at all, so they do drive off the road but at least they.. drive along it mostly now.. Ended up with real life getting in the way for most of the people working on it until it was basically only me writing code, and even I had things get in the way. But that's how things go!
Thank you for playing :)