A tractor-trailer flipped over outside the New Jersey entrance of the Lincoln Tunnel yesterday, spilling 24 tons of hazardous medical waste.

The mess included hypodermic needles and blood, and the trucking company didn’t have the proper permits, sources said.

The accident occurred at 5:15 a.m. when driver Gustavo Chalco, 50, swerved to avoid a vehicle just after he emerged from the tunnel.