Im in eastern Suffolk County.
There are a few good wheeling areas around the island. Basically from personal experience if there is no sign and or no gate it kinda falls under public domain. For instance there is an unfinished road about 1 mile off near the end of the LIE, this unfinished road has no signs, no gate or pavement. But I have been stopped there because one side of the road is for hunters, cop asked if i was hunting i said "no" and then he let me carry on.
I'm going to agree with Rickekila that driving up and down power-lines is partly legal if no sign is posted. Driving like a normal person and not like a rally drive lets you get away with things.
Any way if anyone is still reading this PM me if you want to get a group together or something.
'99 WJ I6 w/ 180k (and Purrs like a kitten)
Claytons LA | 6.5" | HP D44 | F9" | 35's\
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