They are as high as 65.
In North Dakota, the speed limit is 65 mph on two-lane highways if posted for that speed.
the posted speed limit
The speed limit in North Dakota depends on the type of road you are traveling on. It is 55 mph if you are on a gravel or dirt road, paved two lane county road and township highways if there is not a speed limit sign posted.It is 65 mph on a two lane highway if the posted sign says 65. It is 70 mph on paved four-lane divided highways. It is 75 if you are on Interstate 29 or interstate 94.
The speed limit is 55mph.
The normal speed limit on the highway.
Montana
55 on the highway, and 30 in the city.
35 mph in an urban or residential setting. 55 mph on a highway.
It all depends on the type of highway and the speed limit signs.
Whatever the posted speed limit is.
The Autobahn
kilometers
In the US, the maximum speed on an interstate highway is 70. Until recently, there were a couple of stretches of highway that were limitless.