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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).
[1] [2] For instance, Edwards replaced Einstein's postulate that the one-way speed of light is constant when measured in an inertial frame with the postulate: The two-way speed of light in a vacuum as measured in two (inertial) coordinate systems moving with constant relative velocity is the same regardless of any assumptions regarding the one ...
For example, in imperial units, the speed of light is approximately 186 282 miles per second, [Note 3] or roughly 1 foot per nanosecond. [ Note 4 ] [ 15 ] [ 16 ] In branches of physics in which c appears often, such as in relativity, it is common to use systems of natural units of measurement or the geometrized unit system where c = 1 .
The 900 highways are newer or planned roads that have been established for future consideration as or as potential extensions or realignments of highways within the 1 - 216 series. Some of these highways are paved, while others are entirely or partially gravel. Rural speed limits range from 80 km/h (50 mph) to 100 km/h (62 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.
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 ...
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