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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.
39–46 mph 62–74 km/h 17.2–20.7 m/s 18–25 ft 5.5–7.5 m Moderately high waves of greater length; edges of crests break into spindrift; foam is blown in well-marked streaks along the direction of the wind Twigs break off trees; generally impedes progress 9 Strong/severe gale 41–47 knots 47–54 mph 75–88 km/h 20.8–24.4 m/s
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 ...
Over 35 mph (56 km/h) in a school zone, over 20 mph (32 km/h) above the posted speed limit, or over 85 mph (137 km/h) regardless of the posted speed limit. [ 63 ] Defensive driving school (requires court approval for criminal speeding tickets).
On 17 September 2023, Wales introduced a default speed limit of 20 mph (32 km/h) in built up areas. An estimated 7,700 miles (12,400 km) of the 22,000 miles (35,000 km) of road in the country was changed from a 30 mph (48 km/h) to a 20 mph (32 km/h) speed limit, with local authorities allowed to apply for exemptions to the new law. [12]
Within "business or residential" districts, exceeding the speed limit by more than 20 miles per hour (32 km/h) is considered criminal. Within "urbanized areas", 55 miles per hour (89 km/h) speed limit citations are given for "waste of a finite resource". This exception only applies within a 10-mile-per-hour (16 km/h) threshold.
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 ...
km/h mph; Imperial & US customary: mile per hour: mph mph 1.0 mph (1.6 km/h) mph km/h; mile per second: mi/s mi/s 1.0 mi/s (1.6 km/s) mi/s km/s; foot per second: ft/s (foot/s) ft/s long code "foot/s" outputs foot per second (and never feet) 1.0 ft/s (0.30 m/s) ft/s m/s (foot/s m/s) furlong per fortnight: furlong per fortnight (none) 1.0 furlong ...