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A speed limit is the limit of speed allowed by law for road vehicles, usually the maximum speed allowed. Occasionally, there is a minimum speed limit. [1] Advisory speed limits also exist, which are recommended but not mandatory speeds. Speed limits are commonly set by the legislative bodies of national or local governments.
Signs show speed limits in miles per hour (mph) or the national speed limit (NSL) sign may be used. The national speed limit is 70 mph (113 km/h) on motorways and dual carriageways, 60 mph (97 km/h) on single carriageways and generally 30 mph (48 km/h) (20 mph (32 km/h) in Wales) in areas with street lighting (Built-up area).
The highest posted speed limit in the country is 85 mph (137 km/h) and can be found only on Texas State Highway 130, a toll road that bypasses the Austin metropolitan area for long-distance traffic. The highest speed limit for undivided roads is 75 mph (121 km/h) in Texas. Undivided road speed limits vary greatly by state.
The highway is the northernmost county route in Brevard County, located only 1 mi (1.6 km) from the Volusia county line. [9] The route is a super two directly in front of the diamond interchange with I-95, which then condenses to an undivided two-lane road for the remainder of its existence. While short, the speed limit is 45 mph. [10]
UK speed limits apply only to motor vehicles and are shown in mph. [20] With a few exceptions, they are in multiples of 10, ranging from 20 miles per hour (32 km/h) to 70 miles per hour (113 km/h). Unless a lower speed limit is posted on a road, the national speed limit applies, which varies between class of vehicles and the type of road.
Speed limits then propagated across the United States; by 1930 all but 12 states had established numerical limits. [12] In 1903, in the UK, the national speed limit was raised to 20 mph (32 km/h); however, as this was difficult to enforce due to the lack of speedometers, the 1930 "Road Traffic Act" abolished speed limits entirely. In 1934, a ...
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On some stretches of road where the speed limit is reduced at night, the daytime speed limit sign is non-reflective, such that at night, only the night limit is visible. Florida's minimum speed limit on Interstate Highways is 50 mph (80 km/h) in 70 mph zones. In 55 mph, and 65 mph urban interstate zones, the minimum is 40 mph (64 km/h).