why do they call 476 the blue route
Interstate 476 The road received its nickname from a 1958 location report indicating various proposed geographic configurations of an expressway through Delaware County with lines of various colors on a map. The "blue route" through the Crum Creek valley won out over other contenders, which included a more easterly "red route" and "yellow route" and a more westerly "green route".[43]
Area codes 410, 443, and 667 Area codes 410, 443, and 667 are telephone area codes serving the eastern half of the U.S. state of Maryland, including the Baltimore metropolitan area and the Eastern Shore. The 410 area code is the main area code, while the 443 and 667 codes are overlay codes. 443 and 667 were primarily used with cell phones and CLEC carriers such as Comcast or Cavalier Telephone when introduced but have since become universal in their carrier availability.