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In the US, the DOT FHWA has written in a report that "For a given roadway type, there is a strong statistical relationship between speed and crash risk for speeds in the range of 15 mph to 75 mph (25 km/h to 120 km/h). When the mean speed of traffic is reduced, the number of crashes and the severity of injuries will almost always go down.". [174]
80–120 kilometres per hour (50–75 mph) 10 mph (16 km/h) Usual interurban (non urban) speed limit in the European Union (except Cyprus), Albania, Kosovo, Switzerland, and the United Kingdom, outside of motorways and outside of expressways
As of May 15, 2017, 41 states have maximum speed limits of 70 mph (113 km/h) or higher. 18 of those states have 75 miles per hour (121 km/h) speed limits or higher, while 7 states of that same portion have 80 mph (129 km/h) speed limits, with Texas even having an 85 miles per hour (137 km/h) speed limit on one of its toll roads.
Speed limit sign in the Republic of Ireland, using "km/h.". The SI representations, classified as symbols, are "km/h", "km h −1" and "km·h −1".Several other abbreviations of "kilometres per hour" have been used since the term was introduced and many are still in use today; for example, dictionaries list "kph", [3] [4] [5] "kmph" and "km/hr" [6] as English abbreviations.
Within "business or residential" districts, exceeding the speed limit by more than 20 miles per hour (32 km/h) is considered criminal. Within "urbanized areas", 55 miles per hour (89 km/h) speed limit citations are given for "waste of a finite resource". This exception only applies within a 10-mile-per-hour (16 km/h) threshold.
Statutory speed limits for school zones tend to be 30 or 40 km/h (19 or 25 mph) in urban areas and 50 km/h (31 mph) in rural areas. [5] The highest posted speed limit in the country is 120 km/h (75 mph) and can be found only on the Coquihalla Highway .
Authorities in the United States maintain various definitions of high-speed rail. The United States Department of Transportation, an entity in the executive branch, defines it as rail service with top speeds ranging from 110 to 150 miles per hour (180 to 240 km/h) or higher, [10] while the United States Code, which is the official codification of Federal statutes, defines it as rail service ...
In 1966, French Infrastructure Minister Edgard Pisani consulted engineers and gave the French National Railways twelve months to raise speeds to 200 km/h (120 mph). [20] The classic line Paris–Toulouse was chosen, and fitted, to support 200 km/h (120 mph) rather than 140 km/h (87 mph). Some improvements were set, notably the signals system ...