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road space rationing
Road space rationing ((スペイン語:restricción vehicular); (ポルトガル語:rodízio veicular); (フランス語:circulation alternée)) is a travel demand management strategy aimed to reduce the negative externalities generated by urban air pollution or peak urban travel demand in excess of available supply or road capacity, through artificially restricting demand (vehicle travel) by rationing the scarce common good road capacity, especially during the peak periods or during peak pollution events. This objective is achieved by restricting traffic access into an urban cordon area, city center (CBD), or district based upon the last digits of the license number on pre-established days and during certain periods, usually, the peak hours.
The practical implementation of this traffic restraint policy is common in Latin America, and in many cases, the road rationing has as a main goal the reduction of air pollution, such as the cases of México City, and Santiago, Chile. São Paulo, with a fleet of 6 million vehicles in 2007, is the largest metropolis in the world with such a travel restriction, implemented first in 1996 as measured to mitigate air pollution, and thereafter made permanent in 1997 to relieve traffic congestion. More recent implementations in Costa Rica and Honduras have had the objective of reducing oil consumption, due to the high impact this import has on the economy of small countries, and considering the steep increases in oil prices that began in 2003. Bogotá, Quito, and La Paz, Bolivia also have similar restriction schemes in place. After a temporary implementation of road space rationing to reduce air pollution in the city during the 2008 Summer Olympics, Beijing has implemented several rationing schemes to improve the city's air quality. Driving restrictions were issued in Paris and surrounding suburbs during peak pollution events, the latest, in March 2014 and 2015.
==Historical background==
The earliest known implementation of road space rationing took place in Rome, as carriages and carts pulled by horses created serious congestion problems in several Roman cities. In 45 B.C. Julius Caesar declared the center of Rome off-limits between 6 a.m. and 4 p.m. to all vehicles except for carriages transporting priests, officials, visitors, and high ranking citizens.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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