Currently on a poor computer. Does the game adjust itself, and cut down on graphics to help performance?
No, it doesn't adjust itself automatically - there are three different quality settings, though. Once in the game, you can press escape to bring up the options menu and adjust the quality there. The default setting is highest quality, which should run fine on any reasonably modern PC (I developed and tested the game on my four year old laptop and didn't experience any show-stopping performance problems).
Thanks @all for checking out the game! I'm aware that a single player mode and online play are the most requested features everywhere. Unfortunately, my current time budget is a little limited, so you'll have to bug those human friends of yours for the time being. If there's really no one around you can try to play alone in co-op mode and control both, road and car - multitasking ftw!