The highest speed limit in the United States is 85 mph (137 km/h).
Highest Speed Limit in the U.S.
The maximum speed allowed on any public road in the United States is 85 miles per hour. This specific speed limit is not widespread but is exclusively found on a single stretch of tollway.
Location of the 85 mph Speed Limit
This exceptional speed limit is posted on a particular section of toll road located in the exurban areas outside Austin, Texas. It represents the highest legal speed allowed on any road within the country.
To provide a clearer overview of extreme speed limits:
| Limit Type | Speed (mph) | Speed (km/h) | Location / Details |
|---|---|---|---|
| Highest | 85 | 137 | Single stretch of tollway in exurban areas outside Austin, Texas |
| Lowest | 30 | 48 | American Samoa (a U.S. territory, not a state) |
It's important for drivers to always adhere to posted speed limits, as they can vary significantly by state, road type, and even specific segments of a road.
