70
The speed limit on Interstate 90 in South Dakota is 80 mph or 128.7 km/h, except in city limits where the speed limit is lower, usually 55 or 65 mph.
55, in the city, 65 or 70 outside of the city. (U.S.)
The maximum speed limit in Florida is 55 mph, except where otherwise posted. Speed limits are 70 mph on some rural interstate highways.
70 mph - but some states do not allow that speed.
In normal Conditions, if the speed limit is 65, it is generally 50. If the speed limit is 55, then the minimum is 40. In Ky the minimum is 45 mph on any parkway or interstate.
Arizona law is confusing. There is a state maximum 85 MPH limit There is a separate law which says that a 55 MPH limit is absolute. There is another law which sets absolute speed limits of 65 and 75 on rural Interstates. In fact the rural Interstate speed limit is 75 ( and the limit on most other rural roads is 65. The maximum posted speed is 75 mph although the primie facie speed limit is 85 mph for rural highway (outside areas of 50,000 or more population). Within city areas such as Phoenix or Tucson the posted limit varies between 55-65 mph although 85 is still the primie facie limit. The 55 as absolute limit is probably left over from the era when 55 was the maximum limit nationwide and is simply a "waste of finite resources" violation.
55 km = 34.18 miles
The maximum speed limit is not uniform in all US states.ALSO - by "expressway" are you referring to the Interstate Road System or some other arterial highway or parkway?
55
It depends on which state and portion. At times it's 70 MPH, other areas it is 65 MPH. I am not sure if there are parts where it is still 55 MPH.
Interstate 285 has a maximum speed limit of 55 in all circumferential directions. The minimum speed limit is 45. Rarely are speed limits observed on 285. Mostly the top-end perimeter is patrolled by Dunwoody, Sandy Springs and Dekalb police. Trucks over 6 wheels have varying lane restrictions but usually ignore them because of merging traffic in the right lane and slower trucks in the second lane.
On highways that are not limited access roadways is may be legal, according to state law. However, it is NOT legal on interstate highways.