Re: Driveway parking

So, in the case of the driveway parking lot, who would be responsible if, in attempting to navigate the cars to get to his townhouse, my friend hits another car or even part of the exterior structure of the complex?  If cars are parking without permission, and yet no one does anything about this, should my friend be liable for damages?  If the complex’s own insurance pays, then premiums go up, so everyone pays.  If a claim is made due to damage because of this parking problem, could the insurer ask that clear access to units be provided by the cars not parking in the driveway?