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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.
In 1903, in the UK, the national speed limit was raised to 20 mph (32 km/h); however, as this was difficult to enforce due to the lack of speedometers, the 1930 "Road Traffic Act" abolished speed limits entirely. In 1934, a new limit of 30 mph (48 km/h) was imposed in urban centers, and in July 1967, a 70 mph (110 km/h) national speed limit was ...
30 mph (48 km/h) N/A: No limit [71] N/A: 5 mph (8 km/h) United States [fn 16] 25–35 miles per hour (40–56 km/h) (Varies by State) 55–85 miles per hour (89–137 km/h) [fn 20] [fn 21] 40–65 miles per hour (64–105 km/h) [fn 22] Restrictions only in some states, typically 5–15 mph lower. None formally, though jurisdiction-dependent ...
Over 35 mph (56 km/h) in a school zone, over 20 mph (32 km/h) above the posted speed limit, or over 85 mph (137 km/h) regardless of the posted speed limit. [ 63 ] Defensive driving school (requires court approval for criminal speeding tickets).
Alaska stipulates 15 mph (24 km/h) speed limits in alleys and 20 mph (32 km/h) limits in business districts. In Delaware school zones have 20 mph (32 km/h) speed limits. Florida has school zones which usually have 10 mph (16 km/h) to 20 mph (32 km/h) limits. Most use signing and flashing yellow lights during school times, but there is debate ...
The Mackinac Bridge has a speed limit of 45 mph (72 km/h) for passenger vehicles and 20 mph (32 km/h) for trucks, but can be as low as 20 mph (32 km/h) during high winds. [83] The Michigan Department of Transportation and the Michigan State Police may raise the speed limit to 75 mph (121 km/h) after it is deemed safe to do so. [ 84 ]
On 17 September 2023, Wales introduced a default speed limit of 20 mph (32 km/h) in built up areas. An estimated 7,700 miles (12,400 km) of the 22,000 miles (35,000 km) of road in the country was changed from a 30 mph (48 km/h) to a 20 mph (32 km/h) speed limit, with local authorities allowed to apply for exemptions to the new law. [12]
1.0 km/h (0.62 mph) km/h mph; Imperial & US customary: mile per hour: mph mph 1.0 ...