Continuing with GTR8000's thoughts....But what will they switch to if the 700 sites aren't built out yet for the turnpike? And if the answer is the new VHF/800 P25 sites, then why do they need the 700 network for the Turnpike? It turns into a catch-22 real fast. And with all the money problems it seems like the last thing they need to do is build a 3rd radio network on top of the current analog VHF and P25 VHF/800 networks.
While the State towers cover the turnpike (more or less), the Police officers are not the only radio users on the Turnpike radio system.... is a Trunking system a little overkill for the turnpike? maybe. but some of the maintenance traffic for the crews etc can be segmented out a lot easier with trunking. And with appropriate configs and setup.... comms for the users become a lot more transparent for the end user. Scanning conventional and trunking can be done, but sucks and doesn't work as well as staying one format or the other.
As always just my random thoughts at 7:21 in the morning.... YMMV! have a great day!