 SR 337 Alternate begins at the intersection of Portsmouth Boulevard (US 460 Alternate/SR 337) and Turnpike Road, and runs northeast on Turnpike Road.It turns north on Harbor Drive and ends at the London Boulevard overpass, where US 58 joins and the Martin Luther King, Jr. Freeway begins.The route does not return to SR 337, but continuing along US 58 via the freeway and through the Midtown Tunnel will take one back to SR 337 in Norfolk.