The I-64 Hampton Roads Bridge-Tunnel in southeast Virginia has long been one of the region’s most congested corridors. The existing 3.5-mile facility consists of two 2-lane immersed-tube tunnels on artificial islands, with trestle bridges to shore. These tunnels opened in 1957 (current westbound lanes) and 1976 (eastbound lanes) and are about 7,500 feet long. Traffic on these four lanes exceeds 100,000 vehicles per day during peak summer traffic. The Hampton Roads Bridge-Tunnel Expansion Project will ease this congestion with the addition of twin two-lane bored tunnels just west of the existing eastbound tunnel. Also, the I-64 corridor's four-lane segments in the cities of Hampton and Norfolk will be widened.