As of 2014, there are no states without a speed limit in the United States. In the U.S., each state is allowed to set its own speed limits and those limits vary from 10 to 85 miles per hour, depending on the type of road. Roads in urban, high-traffic areas generally have lower speed limits, while rural roads and highways, have higher speed limits.
The state with the slowest top-end speed limit is Hawaii, with an official speed limit of 60 mph. The majority of the Eastern states have a top-end speed limit of 70 mph. The states with the highest speed limit include Idaho, Utah and Wyoming, which have a speed limit of 80 mph on some roads. The fastest road in the country is a section of highway between Austin and San Antonio, Texas, where the speed limit is 85 mph.