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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.
Six hours later, the JMA upgraded the depression into a tropical storm, [3] with the JTWC followed suit based on Dvorak classifications of T2.5/65 km/h (40 mph). [1] Around this time, Flo began to track west-northwest at a pace of 23 km/h (14 mph) under the influence of a subtropical ridge to the north.
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15 mph (24 km/h) in a school zone within 30 minutes of the beginning or end of the school day or whenever/wherever children are present; 20 mph (32 km/h) near an intersection "when the operator's view is obstructed", unless right-of-way is given via signage; 25 mph (40 km/h) in business or residential districts, or other built-up areas
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