Lease vehicles for X cost per month.
You gotta turn it back in in perfect condition if you stop paying. Otherwise you're automatically unauthorized at the end of the month.
Oh, you can't afford the repairs? You're just gonna leave it somewhere? It was 'stolen?' Looks like you got yourself a bounty.
Vehicle Mechanics can add towing out-of-date leased cars to their job duties and score promotions.
Other stuff: Something about leased vehicles being stowed in private garages... other balancing factors... blah blah...
What do y'all think?