The horse is out of the barn, but...
They need to put a HIGH resolution video camera on that Polebridge entrance station and record every vehicle, including license number, that goes in and out. The Polebridge entrance is the only way in or out.
Very good cameras are available and they are not very expensive. Easy to install. I put a 2 systems in for the casinos I work for.
pete
"If you are not curious, you will learn nothing" -Goethe-
"When you're born in this world, you're given a ticket to the freak show.
And when you're born in America, you're given a front row seat." George Carlin