Yeah that's my guess too to keep voice traffic minimal for each site.
They don't let the MODOT guys on Moswin here. Probably because they would easily occupy every channel available on the VHF sites and most likely any 700 MHz sites in range.
MODOT here has a hard enough time talking truck to truck because they desense each other when they try to talk truck to truck during gang plowing! The first snow days here are usually chaos! And when they gang plow and try going through the repeater, it's no better. desense all the way. Dispatch can reach them when they all shut up. It's a shame really as they have a far reaching repeater system when they let it work.
I hear the same dilemma with the other MODOT districts within my range but nothing on the scale that's heard in the St Louis district over the past several years. I equate it to CB channel 19 in its heydays, pure chaos. When the lead gang plow truck can't talk to the truck directly behind him is a huge problem for getting our highways cleared.
And this is in Troop C land on I-64 right in front of the old Troop C headquarters!
MODOT was dispatched out of Kirkwood, MO which was central to the Troop C area years ago. Not sure what happened to that.
Now they are dispatched from 141 and near I-64. It does not seem as efficient Maybe something to do with their Gateway Guide highway camera program that seems to have taken priority over everything else. That's just my feeling but it seems to be true.
The Gateway Guide building house hundreds of street level cameras in which any single camera can be brought up on the center video wall in full screen for all to see.
Good, Bad, I don't know but it surveillance at it's best.
You be the judge if you are a subject in sny of those images.