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Sig Alert. Sig alert, Sig-alert or Sigalert in California, as well as other parts of the United States, means an incident that significantly disrupts road traffic. The term was originally the name of a pioneering system of automated radio broadcasts regarding traffic conditions, introduced in the 1950s and named after its inventor, Loyd Sigmon.
45 mph (72 km/h) The Thomas P. "Tip" O'Neill Jr. Tunnel (colloquially O'Neill Tunnel) is a highway tunnel built as part of the Big Dig in Boston, Massachusetts. It carries the Central Artery underneath downtown Boston, and is numbered as Interstate 93 (I-93), U.S. Route 1 (US 1), and Route 3. It roughly follows the route of the old elevated ...
The Ted Williams Tunnel is a highway tunnel in Boston, Massachusetts.The third in the city to travel under Boston Harbor, with the Sumner Tunnel and the Callahan Tunnel, it carries the final segment of Interstate 90 (the Massachusetts Turnpike) from South Boston towards its eastern terminus at Route 1A in East Boston, slightly beyond Logan International Airport.
Revere, Massachusetts – Copeland Circle (U.S. Route 1, Massachusetts Route 60, is an existing interchange between Route 1 and Route 60. In addition there is an abandoned partially built interchange to Interstate 95 Interstate 695 (Massachusetts)) above the rotary. Revere, Massachusetts - Eliot Circle is at the southern end of Revere Beach.
Tunnel clearance. 13.4 ft (4.1 m) [1] Width. 24.2 ft (7.4 m) [1] The Lieutenant William F. Callahan Jr. Tunnel (colloquially Callahan Tunnel) is one of four tunnels, and one of three road tunnels, beneath Boston Harbor in Boston, Massachusetts. It carries motor vehicles from the North End to Logan International Airport and Route 1A in East Boston.
Operating speed. 40 mph (64 km/h) Tunnel clearance. 12.6 ft (3.8 m) Width. 22.2 ft (6.8 m) The Sumner Tunnel is a road tunnel in Boston, Massachusetts, United States. It carries traffic under Boston Harbor in one direction, from Logan International Airport and Route 1A in East Boston. The tunnel originally deposited traffic at the west side of ...
Transportation in Boston includes roadway, subway, regional rail, air, and sea options for passenger and freight transit in Boston, Massachusetts. The Massachusetts Port Authority (Massport) operates the Port of Boston, which includes a container shipping facility in South Boston, and Logan International Airport, in East Boston.
A 1920 plan for Boston's Central Artery, based on the West Side Elevated Highway Traffic on the former Central Artery at mid-day (Demolished in 2003). A 1926 state report on rapid transit expansion recommended the conversion of the Atlantic Avenue Elevated to an elevated highway; however, it closed in 1938 and was demolished in 1942. [4]