I have never heard any DOT user on the CSP talkgroups, if they do contact the troop, it is very likely by phone. I believe the DOT does not even give the troop control of the cameras, they are controlled by the Newington DOT HQ.
The service patrols use the DOT radios. Also the cameras and traffic signs are all controlled at troop G (aka Bridgeport Control). I believe that the CT Post and possibly channel 8 both did a story on this subject. I don't remember how far back though. Possibly it can be "Googled"