Abstract
In July 2000, the U.S. Federal Communications Commission assigned 511 as the national 3-digit dialing code for travel information. By 2001, the first 511 system began operating in northern Kentucky and in the Cincinnati, OH, metropolitan area; by June 2003, 17 geographic regions had launched 511 services. This article discusses the ongoing implementation of the U.S. national 511 dial-up traveler information network.