To reach most of its other neighbors in the South Hampton Roads sub-region, it is necessary to cross the harbor and/or the mouth of the James River. There are 3 major motor vehicle crossings. Among these are the Hampton Roads Bridge-Tunnel (HRBT) and the Monitor-Merrimac Memorial Bridge-Tunnel (MMMBT), each forming part of the Hampton Roads Beltway. The HRBT is located on Interstate 64 near downtown Hampton and the MMMBT is a few miles away on Interstate 664 near downtown Newport News. (These two major interstates converge in Hampton near the Hampton Coliseum). The third crossing option is the James River Bridge, also in Newport News, which connects to Isle of Wight County and the town of Smithfield.