No big deal and definitely not unusual. In my 22 year career, every one of my cruisers was unmarked except for the light bar...which I took off and stored in the trunk on my days off. Ct. Troopers are issued a car which they keep 24/7/365 because "by law" we are "on duty" 24/7/365. When off duty and in that cruiser, without family in it, the trooper must stop and assist broken down cars on the highway or respond to call for asistance or any emergency that comes up.