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The bridge and torch problem (also known as The Midnight Train [1] and Dangerous crossing [2]) is a logic puzzle that deals with four people, a bridge and a torch. It is in the category of river crossing puzzles , where a number of objects must move across a river, with some constraints.
The crossovers may employ one-side overpasses or be at-grade and controlled by traffic lights. The diverging diamond interchange has advantages in both efficiency and safety, and was cited by Popular Science as one of the best engineering innovations of 2009 [ 3 ] and in the U.S. has been promoted as part of the Federal Highway Administration's ...
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Grade-separated pedestrian and cycling routes often require modest space since they do not typically intersect with the facility (such as a highway) that they cross. However, grade-separated pedestrian crossings with steps introduce accessibility problems. Some crossings have lifts, but these can be time-consuming to use.
In all cases one road crosses the other via a bridge or a tunnel, as opposed to an at-grade crossing. The inter-connecting roads, or slip-roads, which link the two roads, can follow any one of a number of patterns. The actual pattern is determined by a number of factors including local topology, traffic density, land cost, building costs, type ...
A low-water crossing (also known as an Irish bridge or Irish Crossing, causeway in Australia, low-level crossing or low-water bridge) is a low-elevation roadway traversing over a waterbody that stays dry above the water when the flow is low, but is designed to get submerged under high-flow conditions such as floods.
The bridge will have clearances below of 40.5 m (133 ft) (North Channel Bridge) and 72.3 m (237 ft) (South Channel Bridge) to allow large ships to pass under it since Manila Bay is a major shipping route accommodated by the Port of Manila. A shorter Nearshore Navigation Bridge (main span of 150 meters) located on the southern segment of the ...
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