A family member was a NY fire fighter many years ago. The Soviets had a lot of people at the UN, and they had diplomatic plates. They would park wherever they wanted, often blocking things. There was nothing the police could do.

The fire chief decided to have fire drills. Whenever a cop saw a car with diplomatic plates parked in front of a hydrant, they would call the fire department, who would come out and perform a drill. Upon seeing the vehicle blocking the hydrant, they would practice breaching through the vehicle to attain access to the hydrant. The vehicle would not survive in a drivable state.

The Soviets complained, but stopped blocking fire accesses.

EDIT: the firechief could solve this by putting truck or police cruiser style bullbars on their vehicles and "carefully nudging" the miscreant vehicles out the the way.