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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 ...
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.
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 ...
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.
As older vehicle construction regulations allowed a speedometer accuracy of +/- 10%, in the United Kingdom ACPO guidelines recommend a tolerance level of the speed limit "×10% +2 mph" (e.g., a maximum tolerance in a 30 mph (50 km/h) zone of 30 + (30 × 10% = 3) + 2 = 35 mph). [51] In Germany, at least a 3 km/h tolerance (3% of measured speed ...
The time it takes a vehicle to accelerate from 0 to 60 miles per hour (97 km/h or 27 m/s), often said as just "zero to sixty" or "nought to sixty", is a commonly used performance measure for automotive acceleration in the United States and the United Kingdom. In the rest of the world, 0 to 100 km/h (0 to 62.1 mph) is used.