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(Speed limits are indicated in kilometers per hour (km/h), except as noted.) ... 70–90: 10 km/h ... 55–85 miles per hour (89–137 km/h) [fn 20] ...
In Iowa, the majority of highways have a 55 mph (90 km/h) speed limit. Rural Interstate Highways carry a 70 mph (115 km/h) limit and a 40 mph (65 km/h) minimum. Urban Interstate limits generally range from 55 to 65 mph (90 to 105 km/h), but may be lower in areas. Four-lane roads may have a 65 mph (105 km/h) limit.
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.
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.
Final report considered speed limit change induced a 3.5 km/h (2.2 mph) speed decrease and saved 349 lives during the two years which last 20 months [128] Spain (2019) Decrease speed from 100 to 90 km/h (62 to 56 mph) In Spain the year 2019 was the best year with the fewest people killed outside a built-up area.
Rural interstates, the roads most visibly affected by the NMSL, accounted for 10% of the U.S.'s vehicle-miles-traveled in 1973, [33] and although dropping speeds from 75 to 55 mph (120 to 90 km/h) reduces air resistance by over half, such free-flowing roads typically provide more fuel-efficient travel than conventional roads.
The first 20 mph (32 km/h) speed limits for residential areas were introduced in 1991 [n 9] and then speed limiters for buses and coaches set at 65 mph (105 km/h) and also for HGVs set at 56 mph (90 km/h) in 1994. [n 10] It was made easier for local authorities to introduce a 20 mph (32 km/h) limit in 1999. [73]
State-level departments of transportation and council of governments may use different definitions. Below is the list of known definitions of higher-speed rail which use some of the 5 speed levels, 80 mph (130 km/h), 90 mph (145 km/h), 110 mph (175 km/h), 125 mph (200 km/h) and 150 mph (240 km/h):