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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.
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.
On non-freeway roads, speed limits are generally held at 55 mph (89 km/h) for rural four-lane roads, 55 mph (89 km/h) for rural two-lane roads, 45–55 mph (72–89 km/h) for urban four lane roads and 40–45 (sometimes, but rarely, 50 mph) mph (64–72 km/h) for urban two lane roads, 35–45 mph for roads in commercial business areas, 30−35 ...
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 ...
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Excepted [us 1] <10 mph (16 km/h) not allowed: Class 1: 10 mph (16 km/h) 15 mph (24 km/h) Much yard, branch line, short line, and industrial spur trackage falls into this category. Class 2: 25 mph (40 km/h) 30 mph (48 km/h) Branch lines, secondary main lines, many regional railroads, and some tourist operations frequently fall into this class.
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). Matter cannot quite reach the speed of light, as this would require an infinite amount of energy.
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.