Like the TSA and FPS, the agencies of DHS seem to specifically designed to provide policing coverage where jurisdictions issues may have complicated the involvement of local police and FBI responsibility. (politics.stackexchange.com)
The Thruway since 1954 had previously been paying for the State Police coverage. (timesunion.com)
Changing the revenue source did not alter police coverage: Troopers had been on the Thruway continuously, as anyone who uses the road would know. (timesunion.com)