Since my commute is over 20 miles one way, thanks to the advice of others here, I've been investigating using Park and Ride lots. However, the purpose of these lots is to catch busses (in Minneapolis, at least). Is there any problem parking there and riding my bike instead? Do they check at all or would they tow cars that do not appear to be using the lot for the intended purpose? I'd hate to ride back to find my car missing!