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The Big Dig was a megaproject in Boston that rerouted the then elevated Central Artery of Interstate 93 that cut across Boston into the O'Neill Tunnel and built the Ted Williams Tunnel to extend Interstate 90 to Logan International Airport. Those two projects were the origin of the official name, the Central Artery/Tunnel Project ( CA/T Project ).
Jersey barrier. A Jersey barrier, Jersey wall, or Jersey bump is a modular concrete or plastic barrier employed to separate lanes of traffic. It is designed to minimize vehicle damage in cases of incidental contact while still preventing vehicle crossovers resulting in a likely head-on collision. Jersey barriers are also used to reroute traffic ...
There are several types of bridge protection systems used: [7] Pile-supported fender system on the James P. Houlihan Memorial Bridge. Fender systems attached to the pier with the goal to absorb the vessel impact. Their ability to withstand a typical ship collision is low. Fenders are built using a variety of materials: [8] thin-walled concrete box;
The city wall (right) gave Wall Street its name. Boston, Massachusetts, maintained a defensive city wall and gate across Boston Neck, the sole point where the city was connected with the mainland, from 1631 until the end of the 18th century. Charleston, South Carolina was a walled city from the 1690s until the 1720s. A portion of the wall ...
The Boston Municipal Protective Services Department (BMPS) is a former police agency that patrols properties owned and controlled by the City of Boston, the successor agency to the Boston Municipal Police ( BMP ). The primary responsibility of the agency is to enforce all laws of the Commonwealth of Massachusetts and ordinances of the City of ...
Whipple shield used on NASA's Stardust probe. The Whipple shield or Whipple bumper, invented by Fred Whipple, [1] is a type of spaced armor shielding to protect crewed and uncrewed spacecraft from hypervelocity impact / collisions with micrometeoroids and orbital debris whose velocities generally range between 3 and 18 kilometres per second (1.9 and 11.2 mi/s).
The Boston Stone in 1975. The Boston Stone is a stone in Boston, Massachusetts.It is near the Freedom Trail and is a minor tourist attraction.. The stone, a flattened sphere about 2 feet (0.61 m) in diameter, hollowed out on one side, is embedded in the foundation of a building on Marshall Street (a narrow alley named for Thomas Marshall) in the Blackstone Block Historic District.
Blast wall. U.S. and Afghan soldiers standing behind a blast wall made from HESCO bastions in Afghanistan in 2012. A blast wall is a barrier designed to protect vulnerable buildings or other structures and the people inside them from the effects of a nearby explosion, whether caused by industrial accident, military action, or terrorism .
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