You also forgot about the
You also forgot about the front bumper. Private cars do not have that though you can get a snow plow and work privately plowing snow so I guess that could count as a *bumper*. The police bumper I think is used to absorb shock in case of a head on collision or to do the PIT?
As for snow plows
We had a real friendly neighbor in Paradise California and the few times we had a couple inches of snow that would stick like cement he plowed it for free!
You see we lived at 2,000 feet often the rain/snow line for Northern California so one end of town would have a bit of snow and the other half just a cold rain at least once or twice a year.
I don't know why police don't equip their own private blades in front of the police car so while they go cruising they also go plowing at the same time! Two for one!