How's this for an "in-service" look?
This shot was taken of me just clearing an intersection code 3 during the parade at Ripon this year.
Yeah, I agree with Mike. Even though I'm guilty of sneaking in a few uncovered shots on the street, we should, except during sanctioned events, keep our marked cars covered up while on or around public roads. As was rightly pointed out, there are great liability issues both personally and potentially for the hobby as a whole if anything should "go sideways" during even a short photo session.