The city of Concord is located 29 miles east of San Francisco, adjacent to beautiful Mt. Diablo. The city covers 31.13 square miles. With a 2010 census count of 122,067 residents, it is the largest city in Contra Costa County. The city has decommissioned 20 miles of paved roadway on a 5,000-acre site located in the Concord Naval Weapons Station (CNWS) of what has become the GoMentum Station, a premier world class testing facility for connected and autonomous vehicles.