The top speed limit on U.S. roads can vary depending on the state and the type of road. The maximum speed limit is typically set by individual states rather than at the federal level. the highest posted speed limits in the United States are generally found on rural interstates or highways in some states.
In some states, the speed limit can reach up to 85 miles per hour (137 kilometers per hour) on certain sections of rural interstates. For example, Texas and portions of Utah have areas with an 85 mph speed limit. However, it's important to note that not all sections of interstates or highways in these states have the maximum speed limit, and the limits can vary depending on specific road conditions, population density, and other factors.
It's crucial to adhere to the posted speed limits and regulations in the specific state or jurisdiction you are driving in, as speed limits can differ significantly from one state to another, and local laws always take precedence. It's always recommended to drive at safe and appropriate speeds considering road conditions, traffic, and weather factors.