I've just realized that it's curious how the cop pulled him over. Pretty sure tanks aren't fast enough or durable enough to make pursuit, and unless he stops firing while changing lanes, he likely strafed the cop getting off the road.
Frankly, I think the scenario is just too unbelievable. Perhaps a souped-up SWAT van clad with ablative plating and 12 inch thick laminated windshields, but definitely not just some ordinary cruiser.
I dunno. The gun is not aimed downwards, and i suspect the bullet drop is fairly limited for some distance, allowing for the cruiser to potentially pull in underneath the stream. Whoever is driving said cruiser will have some big metal balls to pull it off.
Checking Wikipedia it seems the round drops 1 meter pr 400 meters of travel.
https://what-if.xkcd.com/21/