Actually, I saw a comment to a thread on these forums recently where a large meeting of volunteer firefighters and/or fire police officers was held in Maryland, and virtually every Pennsylvania tagged vehicle that had visible blue lights was ticketed by Maryland police.
My dad is a former PA fire police officer from '77-'84, and when we went down to MD, he covered his lights with cardboard and duct tape. (He had a pair of revolving blue lights on a small light bar on the roof.)
If at all possible, I'd use an out of service cover or something to cover the lights before leaving home. Better to cover them than to be inconveinenced by a delay crossing the border, or by a traffic stop once across, even if no citation is issued to you.
John
Peoria, AZ
Edit: A correction, it was a volunteer firefighter convention in West Virginia, close to the PA border. The West Virginia State Police cited nearly all of the vehicles from PA, because WV law says only LE vehicles can have blue lights. (The post was on page 3 in the now closed Mobile Scanner Law thread in the Florida forum.)
