Are you sure the log trucks are heading to CT? There are no sawmills in CT. They COULD be heading to the port of New Haven to be shipped off shore.
There are mills in northern VT & northern NH that buy Canadian timber. There is only one small sawmill in western MA. I doubt they would be buying timber from Quebec.
There is a tremendous amount of lumber produced in Quebec that travels as far south as SC & GA by truck. Even as far west as OK & TX.
Also,I-91 intersects with I-84,which heads toward New York City and Pennsylvania.