they're more of interop/inter agency channels,they were used during the Super Bowl and during the aftermath of Superstorm Sandy. I've heard NJDOT units doing radio checks recently on them. I don't have any data to give you from the past month since I delete the past day's data. I've been following the progress of the system with Pro96Com since 2011 and it's pretty neat to see!
there's a map on the following site that's shows the Connectivity status of each county: