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States with lower speed limits than pre-1974: 17 [c] The introduction to 70 or 75 mph (112 or 120 km/h) speed limits was in effect that year. The introduction to 80 mph (almost 130 km/h) limits was in about 2005, and Texas introduced 85 mph (136 km/h) in 2011.
In 1941, a speed limit of 70 mph (113 km/h) was established, only to be reduced to 35 mph (56 km/h) during the war years (1942–45). After WWII, the limit was raised to 70 mph on the four-lane sections, with the two-lane tunnels posted at 50 mph (80 km/h) for cars and 40 mph (64 km/h) for trucks.
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.
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 speed limit beyond the sign is the prevailing limit for the general area; for example, the sign might be used to show the end of an urban area. In the United Kingdom, the sign means that the national speed limit applies (60 mph (97 km/h) on open roads and 70 mph (110 km/h) on dual carriageways and motorways).
The Interstate's speed limit is 70 mph (110 km/h) for its entire length in Florida. The portion of I-75 from Tampa northward was a part of the original 1955 Interstate Highway plans, with I-75's southern terminus at I-4's current western terminus.
On July 15, 2007, Kentucky highway officials raised the speed limits on most Interstate and state parkway highways to 70 mph (110 km/h). Prior to that, Kentucky was the only state along I-65 that had a maximum speed limit of 65 mph (105 km/h).
The speed limit on I-494 is 60 mph (97 km/h). Interstate Highways outside of the loop in Minnesota may be signed as high as 70 mph (110 km/h). Most highways inside the loop are signed at speeds of 55 mph (89 km/h) or lower, though a few exceptions were added in September 2005, allowing speeds of up to 60 mph (97 km/h) in some places.