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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]
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.
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.
[2] [3] The UAE is notable for having some of the highest posted speed limits in the world, with two major highways, the Abu Dhabi-Al Ain highway and the Sheikh Khalifa highway, both having limits of 160 km/h (99 mph).
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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.
His four-seam fastball averaged 100.2 mph and topped out at 102.0 mph, with Dodgers hitters whiffing 13 times on 28 swings, in addition to 10 called strikes.