What is the speed limit on rural Interstate highways unless otherwise posted?

The speed limit on rural Interstate highways in North Dakota, unless otherwise posted, is 75 miles per hour. This limit is generally established to optimize traffic flow and safety on these highways, which are designed for higher-speed travel compared to urban roads.

Maintaining a speed limit of 75 miles per hour helps ensure a balance between efficient travel times and minimizing the risk of accidents, as it allows vehicles to operate within a range that considers typical vehicle capabilities and roadway conditions. While some other speed limits might be encountered in various zones or types of roads, rural Interstates are specifically set at this higher limit to accommodate the nature of long-distance travel in these areas.