Speed LimitsUS Interstate Speed Limits 2026: No National Number
The United States has no national speed limit. Interstates run from 55 mph in a few states to 85 mph on one Texas toll road, with 65-75 mph typical. All signs are in miles per hour.
The United States has no national speed limit. Each state sets its own, so the legal maximum on the road under your wheels changes the moment you cross a state line.
The federal limit was repealed in 1995
For twenty years there really was a national number: the 55 mph limit imposed during the 1973 oil crisis, later relaxed to 65 on rural interstates. Congress repealed it in 1995 and handed the question back to the states, and they have been diverging ever since.
What that leaves is a patchwork. Rural interstates across most of the country sit at 70 or 75 mph. Much of the interior West runs at 80. One stretch of Texas toll road is posted at 85 mph, the highest in the country. A handful of urban corridors and older north-eastern states hold 55 or 65. Any source quoting you a single figure for “the American speed limit” has invented it.
| Typical posted limit | Where you find it |
|---|---|
| 55–65 mph | Urban interstates, older north-eastern routes, Hawaii |
| 70–75 mph | Rural interstates in most states |
| 80 mph | Rural interstates in parts of the West |
| 85 mph | One Texas toll road section |
Everything is signed in miles per hour. If you think in km/h, the conversions worth memorising are 65 mph ≈ 105, 70 ≈ 113 and 80 ≈ 129.
Urban and Surface Roads
City and residential limits are set locally and typically fall between 25 and 35 mph. School zones drop lower during posted hours and are enforced hard. There is no national default to fall back on here either — the sign is the rule.
Speeding Penalties
Fines are set by state and often by county, and the same speed can cost wildly different amounts a hundred miles apart. As a rough shape:
- 1–10 mph over: roughly $50–150
- 11–20 mph over: roughly $100–300
- 21–30 mph over: roughly $200–500
Work zones and school zones commonly double the fine. Several states treat excessive speed as reckless driving, which is a criminal charge rather than a ticket.
Check exact speed limits for your route
Open Speed Limit MapWhat Most Guides Don’t Tell You
The state line is a rule change, not a formality
Limits, tolerances, fine structures, radar-detector legality and even the definition of reckless driving all change at the border. A cross-country drive passes through a dozen different enforcement regimes, and the only consistent signal is the sign you just passed.
Enforcement style varies more than the limits
Some states run dense highway-patrol coverage with marked and unmarked cars; others rely on county sheriffs and have long stretches with no presence at all. Automated speed cameras are common in some jurisdictions and outright banned in others. You cannot generalise from one state’s driving to the next.
Radar detectors: legal, mostly
Detectors are legal for passenger cars in most states. Virginia and the District of Columbia prohibit them, and they are banned in commercial vehicles everywhere. A rental car does not come with one.
The out-of-state ticket follows you home
Most states share conviction data through interstate compacts, so a ticket collected on a road trip can surface on your home record and your insurance premium. For international visitors, the rental company is the collection route: the fine plus an administration fee lands on the card you left on file.
Foreign licences and IDPs
Requirements vary by state, which is the theme of this page. Most accept a valid foreign licence for a short visit, and several want an International Driving Permit alongside it. Check the specific states on your route rather than the country.
How the United States Compares
| Country | Urban | Rural | Motorway | Driving Side |
|---|---|---|---|---|
| United States | 25–35 mph (40–56 km/h) | Set by state | 55–85 mph (89–137 km/h), no national limit | Right |
| Canada | 50 km/h | 80 km/h | 100 km/h | Right |
| Mexico | 40 km/h | 80 km/h | 110 km/h | Right |
Key Facts at a Glance
| Country | United States |
| National speed limit | None — set by each state |
| Typical rural interstate | 70–75 mph |
| Highest posted limit | 85 mph, one Texas toll road |
| Lowest common interstate limit | 55 mph |
| Units | Miles per hour |
| Driving side | Right |
| Blood alcohol limit | 0.08 |
| Radar detectors | Legal in most states; not Virginia or DC |
| Emergency number | 911 |
More Resources
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Related Questions
There is no single national figure. Speed limits are set state by state, so an interstate can be 65 mph in one state and 80 in the next with nothing but a sign to mark the change.
Texas, where one stretch of toll road is posted at 85 mph. Several western states allow 80 mph on rural interstates.
In most states, yes for passenger cars. Virginia and the District of Columbia are the notable exceptions, and detectors are prohibited in commercial vehicles nationwide.
Miles per hour, on every sign in the country. A 70 mph interstate limit is about 113 km/h.