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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.
The first numeric speed limit for automobiles was the 10 mph (16 km/h) limit introduced in the United Kingdom in 1861. [3] As of 2018 the highest posted speed limit in the world is 160 km/h (99 mph), applied on two motorways in the UAE. [4]
Point system may lead to license suspension. Exceeding the speed limit by more than 15 mph (24 km/h) with a speed of greater than 55 mph (89 km/h) or travelling faster than 80 mph (129 km/h) results in a minimum 30-day license suspension. [67] Pennsylvania: $35 [68] plus court and other costs. All fines doubled in active work zones. Absolute
Converts measurements to other units. Template parameters [Edit template data] This template prefers inline formatting of parameters. Parameter Description Type Status Value 1 The value to convert. Number required From unit 2 The unit for the provided value. Suggested values km2 m2 cm2 mm2 ha sqmi acre sqyd sqft sqin km m cm mm mi yd ft in kg g mg lb oz m/s km/h mph K C F m3 cm3 mm3 L mL cuft ...
(mph) (km/h) (m/s) Subsonic <0.8 <530 <609 <980 <273 Most often propeller-driven and commercial turbofan aircraft with high aspect-ratio (slender) wings, and rounded features like the nose and leading edges. The subsonic speed range is that range of speeds within which, all of the airflow over an aircraft is less than Mach 1.
15 mph (24 km/h) in the area of a vehicle (for example, an ice cream truck) that is selling merchandise and is displaying flashing amber lights; 20 mph (32 km/h) in a school zone when children are present; 30 mph (48 km/h) on a road in a "thickly settled" or business district for at least 1 ⁄ 8 mile (200 m)
SI, and hence the use of "km/h" (or "km h −1 " or "km·h −1 ") has now been adopted around the world in many areas related to health and safety [36] and in metrology [37] in addition to the SI unit metres per second ("m/s", "m s −1 " or "m·s −1 "). SI is also the preferred system of measure in academia and in education.
Cunard's Mauretania held the Blue Riband from 1909 to 1929 at 26.06 knots (48.26 km/h; 29.99 mph) NDL's Bremen finally broke Mauretania's record in 1929 by averaging 27.83 knots (51.54 km/h; 32.03 mph) The Italian Rex joined the Blue Riband club with a 1933 voyage of 28.92 knots (53.56 km/h; 33.28 mph) CGT's Normandie won the Blue Riband at 30. ...