The minimum speed limit on Interstate highways in the United States is typically around 40-45 miles per hour, but this can vary depending on the state and specific roadway. It is important for drivers to adhere to posted speed limits for safety reasons and to maintain the flow of traffic. Failure to do so can result in citations or accidents.
45 mph
Auxiliary Interstate Highways and Primary Interstate Highways
70 MPH on Interstate Highways.
70 MPH
Most interstate highways were designed for the posted speed limits on those interstates.
On any Interstate highway the minimum speed you can travel is 45 mph. On some highways that were grandfathered into the system it can be as lows as 40 mph. On state roads the minimum speed is always posted if there is one. Otherwise the law states that you cannot drive at a speed that impedes the flow of traffic. That determination will be made by an officer of the law.
It can be from 60 to 85 mph.
Utah and Missouri. Actually, there are 5 Interstate highways in Utah and 17 in Missouri. The only state without any Interstate highways is Alaska.
45 MPH
There are several Interstate Highways with a 75 MPH speed limit at various points throughout their span, but there isn't one which has that speed limit at every single point.
The major highways are highway 50 highway 99 and highway 101 As well as Interstate 5, Interstate 40, Interstate 15, Interstate 8, and Interstate 80.
The minimum will vary by locale, but will normally be either 40, 45, or rarely 50 mph for limited access highways. The minimum speed on the Interstate Highway System is either 40 or 45 mph and is set within each state based on road conditions and traffic levels.