Why even park?
Just leave the car in the middle of the road.
If plod comes then tell him the car is driving itself and you don't know why it isn't moving.
It brings to mind a whole lot of interesting questions...
Who is going to be fined/charged when a car does not obey a cop and pull over/move on etc?
I'm expecting a lot of engineers are going to spend a lot of time in court explaining why the car did X when people think it should have done Y.
Just look at all the crap Toyota went through due to issues iwth just their accelerator. Imagine what the bunfights will be like when the car is fully autonomous.
One group of people who're smacking their lips are the lawyers and "expert witnesses" who make hundreds of $ per hour either prosecuting or defending these cases.