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Traffic Congestion
Traffic congestion is a condition in transport that is characterized by slower speeds, longer trip times, and increased vehicular queueing. Traffic congestion on urban road networks has increased substantially since the 1950s. When traffic demand is great enough that the interaction between vehicles slows the speed of the traffic stream, this results in some congestion. While congestion is a possibility for any mode of transportation, this article will focus on automobile congestion on public roads. As demand approaches the capacity of a road (or of the intersections along the road), extreme traffic congestion sets in. When vehicles are fully stopped for periods of time, this is known as a traffic jam or (informally) a traffic snarl-up. Traffic congestion can lead to drivers becoming frustrated and engaging in road rage. Mathematically, traffic is modeled as a flow through a fixed point on the route, analogously to fluid dynamics. Causes Traffic congestion occurs wh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Philip Ball
Philip Ball (born 1962) is a British science writer. For over twenty years he has been an editor of the journal ''Nature'' for which he continues to write regularly. He now writes a regular column in '' Chemistry World''. He has contributed to publications ranging from ''New Scientist'' to the ''New York Times'', ''The Guardian'', the ''Financial Times'' and ''New Statesman''. He is the regular contributor to ''Prospect'' magazine, and also a columnist for ''Chemistry World'', '' Nature Materials'' and BBC Future. He has broadcast on many occasions on radio and TV, and in June 2004 he presented a three-part serial on nanotechnology, ''Small Worlds'', on BBC Radio 4. Work Ball's 2004 book '' Critical Mass: How One Thing Leads to Another'' was the winner of the 2005 Aventis Prize for Science Books. It examines a wide range of topics including the business cycle, random walks, phase transitions, bifurcation theory, traffic flow, Zipf's law, Small world phenomenon, catastroph ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Traffic Jam In Haikou, Hainan, China 01
Traffic comprises pedestrians, vehicles, ridden or herded animals, trains, and other conveyances that use public ways (roads) for travel and transportation. Traffic laws govern and regulate traffic, while rules of the road include traffic laws and informal rules that may have developed over time to facilitate the orderly and timely flow of traffic. Organized traffic generally has well-established priorities, lanes, right-of-way, and traffic control at intersections. Traffic is formally organized in many jurisdictions, with marked lanes, junctions, intersections, interchanges, traffic signals, or signs. Traffic is often classified by type: heavy motor vehicle (e.g., car, truck), other vehicle (e.g., moped, bicycle), and pedestrian. Different classes may share speed limits and easement, or may be segregated. Some jurisdictions may have very detailed and complex rules of the road while others rely more on drivers' common sense and willingness to cooperate. Organization typ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Road Works
Roadworks (called road work or road construction in the United States) occur when part of the road A road is a linear way for the conveyance of traffic that mostly has an improved surface for use by vehicles (motorized and non-motorized) and pedestrians. Unlike streets, the main function of roads is transportation. There are many types of ..., or in rare cases, the entire road, has to be occupied for work relating to the road, most often in the case of road surface repairs. In the United States road work could also mean any work conducted in close proximity of travel way (thoroughfare) such as utility work or work on power lines (i.e. telephone poles). The general term of road work is known as work zone. Roadworks can, however, also happen when a major Traffic collision, accident occurs and road debris from the crash needs to be cleared. Roadworks are often signposted, although it is possible that the signage comes too late or too sudden or is missing. Typical road wo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Road Pricing
Road pricing (also road user charges) are direct charges levied for the use of roads, including road tolls, distance or time-based fees, congestion charges and charges designed to discourage the use of certain classes of vehicle, fuel sources or more polluting vehicles. These charges may be used primarily for revenue generation, usually for road infrastructure financing, or as a transportation demand management tool to reduce peak hour travel and the associated traffic congestion or other social and environmental negative externalities associated with road travel such as air pollution, greenhouse gas emissions, visual intrusion, noise pollution and road traffic collisions. ''Executive Summary, pp. v''. In most countries toll roads, toll bridges and toll tunnels are often used primarily for revenue generation to repay long-term debt issued to finance the toll facility, or to finance capacity expansion, operations, and maintenance of the facility itself, or simply as gen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Private Highway
A private highway is a highway owned and operated for profit by private industry. Private highways are common in Asia and Europe; in addition, a few have been built in the United States on an experimental basis. Typically, private highways are built by companies that charge tolls for a period while the debt is retired, after which the highway is turned over to government control. This allows governments to fulfill immediate transportation needs despite their own budget constraints, while still retaining public ownership of the roads in the long term. An obstacle to private highways is that government regulation can stifle price flexibility and introduce negotiation and paperwork requirements that increase operational expenses, while having to compete against free public roads. In addition, private highways lack some advantages that governments have, such as sovereign immunity against liability for accidents, the use of eminent domain power to acquire private property for roads and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
