Interstate 664 (I-664) is an intrastate auxiliary Interstate Highway in the U.S. state of Virginia. The Interstate runs from I-64 and I-264 in Chesapeake north to I-64 in Hampton. I-664 forms the west side of the Hampton Roads Beltway, a circumferential highway serving the Hampton Roads metropolitan area. The Interstate crosses Hampton Roads via the Monitor-Merrimac Memorial Bridge-Tunnel between Suffolk and Newport News. I-664 is connected to the other major cities of the metropolitan area—Portsmouth, Norfolk, and Virginia Beach—by I-264. The Interstate also has a connection to Portsmouth through Virginia State Route 164 (SR 164) and to Suffolk via U.S. Route 13, US 58, and US 460.