 The roadway leaves the tunnel at another artificial island, at which point it resumes along a pair of low-level trestle bridges carrying two lanes in each direction.The bridge–tunnel curves northeast and reaches another artificial island, where the highway again narrows to a two-lane undivided road and enters the Chesapeake Channel Tunnel that heads under another shipping channel.The road leaves the tunnel on another artificial island and returns to a pair of low-level trestle bridges carrying two lanes in each direction.