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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.
The record is 44.72 km/h (27.78 mph), measured between meter 60 and meter 80 of the 100 meters sprint at the 2009 World Championships in Athletics by speed. [4] [5] (Bolt's average speed over the course of this race was 37.578 km/h or 23.35 mph.) [6] Compared to quadrupedal animals, humans are exceptionally capable of endurance, but incapable of great speed. [7]
<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.
< 1 mph < 1 km/h 0–0.2 m/s: 0 ft 0 m Sea like a mirror Smoke rises vertically 1 Light air 1–3 knots 1–3 mph 1–5 km/h 0.3–1.5 m/s 0–1 ft 0–0.3 m Ripples with appearance of scales are formed, without foam crests Direction shown by smoke drift but not by wind vanes 2 Light breeze 4–6 knots 4–7 mph 6–11 km/h 1.6–3.3 m/s
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.
The Devel Sixteen is a mid-engine track-only sports car designed in the United Arab Emirates by Devel Motors.Devel Motors claims the V16 quad-turbo version of the car to be the fastest car in the world, with a claimed top speed of 348 mph (560 km/h) and a claimed 0–60 mph time of 1.8 seconds; its announced base version price is $1.7 million.
The comfortable hopping speed for a kangaroo is about 21–26 km/h (13–16 mph), but speeds of up to 71 km/h (44 mph) can be attained over short distances, while it can sustain a speed of 40 km/h (25 mph) for nearly 2 km (1.2 mi). [89]
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 Venezuela: 40–60 kilometres per hour (25–37 mph) 120 ...