 From here, the route heads onto the Chesapeake Bay Bridge–Tunnel, a bridge–tunnel complex that carries US 13 across the Chesapeake Bay.The road leaves the mainland of Virginia Beach and heads over the bay on a pair of low-level trestle bridges, with one bridge carrying two lanes of northbound traffic and the other bridge carrying two lanes of southbound traffic.The road reaches an artificial island that is home to a fishing pier, where it narrows to a two-lane undivided road and heads into the Thimble Shoal Tunnel that passes under a shipping channel.