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As an emergency response to the 1973 oil crisis, on November 26, 1973, President Richard Nixon proposed a national 50 mph (80 km/h) speed limit for passenger vehicles and a 55 mph (90 km/h) speed limit for trucks and buses. Also proposed were a ban on ornamental lighting, no gasoline sales on Sunday, and a 15% cut in gasoline production to ...
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.
For example, the maximum speed limit is 75 mph (120 km/h) in northern Maine, varies between 50 and 70 mph (80 and 115 km/h) [51] from southern Maine to New Jersey, and is 50 mph (80 km/h) in New York City and the District of Columbia. [50] Currently, rural speed limits elsewhere generally range from 65 to 80 miles per hour (105 to 130 km/h).
State-level departments of transportation and council of governments may use different definitions. Below is the list of known definitions of higher-speed rail which use some of the 5 speed levels, 80 mph (130 km/h), 90 mph (145 km/h), 110 mph (175 km/h), 125 mph (200 km/h) and 150 mph (240 km/h):
Under the most common international definition of high-speed rail (speeds above 155 mph (250 km/h) on newly built lines and speeds above 124 mph (200 km/h) on upgraded lines), Amtrak's Acela is the United States' only true high-speed rail service, reaching 150 mph (240 km/h) over 49.9 miles (80.3 km) of track along the Northeast Corridor. [2]
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.
Minimum design speed: A minimum design speed of 70 mph (113 km/h) is to be used, except in mountainous and urban areas, where the minimum is 50 mph (80 km/h). [ 4 ] The sight distance , curvature and superelevation of the highway should follow the current edition of AASHTO's A Policy on Geometric Design of Highways and Streets for the chosen ...
The Federal Railroad Administration uses a definition of top speeds at 110 mph (180 km/h) and above. [199] The Congressional Research Service uses the term "higher-speed rail" for speeds up to 150 mph (240 km/h) and "very high-speed rail" for the rail on dedicated tracks with speeds over 150 mph. [200]