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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.
Miles per hour (mph, m.p.h., MPH, or mi/h) is a British imperial and United States customary unit of speed expressing the number of miles travelled in one hour.It is used in the United Kingdom, the United States, and a number of smaller countries, most of which are UK or US territories, or have close historical ties with the UK or US.
Speed limit sign on a single-carriageway road indicating a speed limit of 50 mph (80 km/h). The limits are posted on both sides of the road. Sign at the Republic of Ireland–United Kingdom border indicating that limits in Northern Ireland (part of the United Kingdom) are given in miles per hour, unlike those in the Republic, which are given in ...
The time it takes a vehicle to accelerate from 0 to 60 miles per hour (97 km/h or 27 m/s), often said as just "zero to sixty" or "nought to sixty", is a commonly used performance measure for automotive acceleration in the United States and the United Kingdom. In the rest of the world, 0 to 100 km/h (0 to 62.1 mph) is used.
40–65 miles per hour (64–105 km/h) [fn 21] Restrictions only in some states, typically 5–15 mph lower. None formally, though jurisdiction-dependent Venezuela: 40–60 kilometres per hour (25–37 mph) 120 [fn 22] 60–120: 80: 40–60: 5 mph (8 km/h) Vietnam [72] 50–60: 120 (100) 60–90: 60–80: 60–80: 20 km/h Zimbabwe: 60 ...
The National Maximum Speed Limit (NMSL) was a provision of the federal government of the United States 1974 Emergency Highway Energy Conservation Act that effectively prohibited speed limits higher than 55 miles per hour (89 km/h). The limit was increased to 65 miles per hour (105 km/h) in 1987. It was drafted in response to oil price spikes ...
<10 mph (16 km/h) not allowed: Class 1: 10 mph (16 km/h) 15 mph (24 km/h) Much yard, branch line, short line, and industrial spur trackage falls into this category. Class 2: 25 mph (40 km/h) 30 mph (48 km/h) Branch lines, secondary main lines, many regional railroads, and some tourist operations frequently fall into this class.
The idea of a 50-mile, twenty hour march developed from Kennedy's discovery in late 1962 of an executive order from Theodore Roosevelt, which challenged U.S. Marine officers to finish 50 miles (80 km) in twenty hours, spread out over a maximum of three days.