The 24-year-old Ocean County resident, whose name has not been released, stopped on Route 679 in Tuckerton and tried to use a stick to move the snake off the road.
Environmental Protection Department spokesman Larry Ragonese told The Star-Ledger of Newark the snake squirmed free, wrapped itself around the man's arm and sank its fangs into his hand.
The man drove three miles to seek help and was flown by helicopter to a hospital.
Timber rattlesnakes are the only venomous snakes in that part of the Pinelands.
Information from: The Star-Ledger