Policeman, Sheriff, Forest Service, Security, Parking Enforcement, etc... Any authority that has a row of lights on its roof and can punish you.
We'd better go inside, that's the second light bar that's cruised by in the last ten minutes.
The bar seen atop emergency vehicles that and service vehicles that flashes color(s) to warn oncoming motorists.
Pull over for that ambulance see the red flashing light bar?
Better turn on the lights we have a 10-26 at 35th and Lennox proceed code 3.