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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.
The fastest possible speed at which energy or information can travel, according to special relativity, is the speed of light in vacuum c = 299 792 458 metres per second (approximately 1 079 000 000 km/h or 671 000 000 mph).
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.
Research in 1998 showed that the reduction of some 30 mph (48 km/h) United Kingdom speed limits to 20 mph (32 km/h) had achieved only a 1 mph (1.6 km/h) drop in speeds and no discernible reduction in accidents; 20 mph (32 km/h) speed limit zones, which use self-enforcing traffic calming, achieved average speed reductions of 10 mph (16 km/h ...
Some airspeed indicators in aircraft prior to the mid-1970s indicate in miles per hour plus knots (1 knot = 1.15 mph) or kilometers per hour (1 knot = 1.85 km/h). A primary flight display with the indicated airspeed (IAS) displayed in the form of a vertical "tape" on the left.
5 km/h up to 100 km/h, 5% above 100 km/h for fixed cameras; doubled for mobile radars Georgia [30] 60 (20 in residential areas) 110: 80: 90: 70: 10 Germany [31] 50: None, recommended speed 130 km/h. [fn 7] 80–100 [fn 8] 100 60 (trucks) 80: 3 km/h up to 100 km/h, 3% over; differs for different speeding control methods Greece [32] 50: 110 ...
The length of the internationally agreed nautical mile is 1 852 m. The US adopted the international definition in 1954, having previously used the US nautical mile ( 1 853 .248 m ). [ 6 ] The UK adopted the international nautical mile definition in 1970, having previously used the UK Admiralty nautical mile ( 6 080 ft or 1 853 .184 m ).
Louis Rigolly in his car which first exceeded 100 mph in 1904. Louis Rigolly (1876–1958), a Frenchman, was the first man to drive a car at over 100 miles per hour (160 km/h). [1] He set a record of 103.561 mph (166.665 km/h) on a beach at Ostend in Belgium on 21 July 1904, driving a 13.5 litre Gobron-Brillié [2] racing car.