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The center of Columbia is located at 39°12.5′N 76°52′W  /  39.2083°N 76.867°W  / 39.2083; -76.867 . However, because it is unincorporated, there is confusion over its exact limits. In the strictest definition, Columbia comprises only the land governed under covenants by the Columbia Association. This is a considerably smaller area than the census-designated place (CDP) as defined by the United States Census Bureau , which has a total area of 32.2 square miles (83.4 km 2 ), of which 31.9 square miles (82.7 km 2 ) is land and 0.27 square miles (0.7 km 2 ) of it (0.80%) is water. The CDP includes a number of older communities which do not lie within the CA's purview, including the Holiday Hills, Diamondback, and Allview subdivisions and the former town of Simpsonville, as well as some land on the east side of Clarksville . These areas are not part of the "new town", and are not directly served by its amenities. Some of these areas are included in Columbia ZIP codes by the post office, and some are not.
The city lies in the Piedmont region of Maryland, with its eastern edge at the fall line . The climate is that of central Maryland, tending to hot, humid summers and cool to cold and wet winters. The primary landforms in Columbia are rolling hills and stream valleys; Columbia's road network is laid out to follow the terrain, with many winding streets and cul-de-sacs . Elevations range from about 200 to 500 feet (61 to 152 m) above sea level. Most of Columbia is drained by the Middle Patuxent and Little Patuxent rivers. There are three artificial lakes, created by damming of tributary streams during city construction. In 1965, the Rouse Company leased 7,000 acres (2,800 ha) of farmland staged for development, and earmarked 4,000 acres (1,600 ha) of oak forest for timber harvesting. The company developed a sapling planter to replant sections of cleared land that would use Columbia's W.R. Grace developed fertilizers. A outer ring of green-space was abandoned early in the project because the combination with the already required river buffers would have reduced profitable land available for building. Along with Symphony Woods , many other stands of mature trees have been temporarily maintained in Columbia, including the large Middle Patuxent Environmental Area in the western part of the city between Harper's Choice and River Hill villages, protecting much of the river valley from development.
Did You Know

QuestionIn many countries, driving a truck requires a special driving license. The requirements and limitations vary with each different jurisdiction.

Question“The association of truckers with cowboys and related myths was perhaps most obvious during the urban-cowboy craze of the late 1970s, a period that saw middle-class urbanites wearing cowboy clothing and patronizing simulated cowboy nightclubs. During this time, at least four truck driver movies appeared, CB radio became popular, and truck drivers were prominently featured in all forms of popular media.” — Lawrence J. Ouellet

QuestionAdvocation for better transportation beganhistoricallyin the late 1870s of the United States. This is when the Good Roads Movement first occurred, lasting all the way throughout the 1920s. Bicyclist leaders advocated for improved roads.Their acts led to the turning of local agitation into the national political movement it became.

QuestionThe USDOT (USDOT or DOT)is considereda federal Cabinet department within the U.S. government.Clearly, this department concerns itself with all aspects of transportation with safety as a focal point.The DOT wasofficiallyestablished by an act of Congress on October 15, 1966, beginning its operation on April 1, 1967. Superior to the DOT, the United States Secretary of Transportation governs the department.The mission of the DOT is to "Serve the United States by ensuring a fast, safe, efficient, accessible, and convenient transportation system that meets our vital national interests and enhances the quality of life for the American people, today and into the future." Essentially thisstates how important it is to improve all types of transportation as a way to enhance both safety and life in general etc.It is important to note that the DOT is not in place to hurt businesses, but to improve our "vital national interests" and our "quality of life". The transportation networks are in definite need of such fundamental attention. Federal departments such as the USDOT are key to this industry by creating and enforcing regulations with intentions to increase the efficiency and safety of transportation.


A circumferential route refers to a public transportation system that follows the route in the shape of a circle.Over time a nickname developed in the European Union, calling transportation networks such as these a "ring road".This is no surprise as Europe has several famous "ring roads" such as the Berliner Ring, the Brussels Ring, the Amsterdam Ring, the Boulevard Périphérique around Paris and the Leeds Inner and Outer ring roads. Other countries adopted the term as well which in turn made the name go international.Australia's Melbourne's Western Ring Road and India's Hyderabad's Outer Ring Road both adopted the name.Howeverin Canada, the term is mostcommonlyused, with "orbital" used to a much lesser extent.
On the contrary, the United States calls many "ring roads" as belt-lines, beltways, or loops instead.For example, the Capital Beltway around Washington, D.C. Some ring roads use terminology such as "Inner Loop" and "Outer Loop".This is, of course, for the sake of directional sense, since compass directions cannotbe determinedaround the entire loop.


The term 'trailer' iscommonlyusedinterchangeablywith that of a travel trailer or mobile home. There are varieties of trailers and manufactures housing designed for human habitation.Such origins canbe foundhistoricallywith utility trailers built in a similar fashion to horse-drawn wagons. A trailer park is an area where mobile homesare designatedfor people to live in.
In the United States, trailers ranging in size from single-axle dollies to 6-axle, 13 ft 6 in (4,115 mm) high, 53 ft (16,154 mm) in long semi-trailers is common.Although, when towed as part of a tractor-trailer or "18-wheeler", carries a large percentage of the freight.Specifically, the freight that travels over land in North America.