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The Houston tunnel system is a network of subterranean, climate-controlled, pedestrian walkways that links 95 full city blocks 20 feet (6 m) below Houston's downtown streets. It is approximately six miles (9.7 km) long. [1] There are similar systems in Chicago, Dallas, Oklahoma City, Montreal, and Toronto.
The main disadvantage of a road verge is that the right-of-way must be wider, increasing the cost of the road. In some localities, a wider verge offers opportunity for later road widening, should the traffic usage of a road demand this. For this reason, footpaths are usually sited a significant distance from the curb. [citation needed]
Houston, Texas: the seven-mile (11 km) Houston tunnel system is set about twenty feet below Houston's downtown street system and is composed of underground passageways which, with above-ground skywalks, link office towers to hotels, banks, corporate and government offices, restaurants, retail stores, and the Houston Theater District.
Poles, from which these buildings get their name, are natural shaped or round wooden timbers 4 to 12 inches (100 to 300 mm) in diameter. [4] The structural frame of a pole building is made of tree trunks, utility poles, engineered lumber or chemically pressure-treated squared timbers which may be buried in the ground or anchored to a concrete slab.
Skyway (formerly TerminaLink) is an automated people mover system operating at George Bush Intercontinental Airport in Houston, Texas.The system is 0.7 miles (1.1 km) long, [2] and runs along the north side of the airport, beyond airport security. [3]
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The land surface in and around the city of Houston is composed of alternating layers of red, gray, sandy brown, and black organic clay; these strata generally dip to the southeast at a slope of 0.06% (3 feet (0.91 m) of vertical change for every 1 mile (1.6 km) of distance traveled). [6]
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