Speed Limits
A.R.S. 28-701 — reasonable and prudent, with 15, 25 and 65 miles per hour as the default measures
Reasonable and prudent first. A person may not drive faster than is reasonable and prudent under the conditions and actual and potential hazards, and controls speed as necessary to avoid colliding with anything on, entering or next to the highway.
| Where | Speed that is prima facie too great, unless posted otherwise |
|---|---|
| WhereApproaching a school crossing | Speed that is prima facie too great, unless posted otherwiseOver 15 miles per hour |
| WhereA business or residential district | Speed that is prima facie too great, unless posted otherwiseOver 25 miles per hour |
| WhereOther locations | Speed that is prima facie too great, unless posted otherwiseOver 65 miles per hour |
On interstate highways outside an urbanized area of fifty thousand or more people, the limit is 65 miles per hour, and the director may raise it to 75 miles per hour on one interstate or all of them. Exceeding it is a civil traffic violation.
The maximum drops to what is reasonable and prudent near intersections, railroad crossings, curves and hillcrests, on narrow or winding roads, and in special hazards from pedestrians, traffic, weather or road conditions. Driving slower than is reasonable and prudent is also prohibited.
Sources for this section (2)
- A.R.S. 28-701 — Reasonable and prudent speed; prima facie evidence; exceptions
- A.R.S. 28-702.04 — Maximum speed limit on interstate highways outside urbanized areas and within certain counties
Legal information, not legal advice. Verified as of September 2026. Applying it to a particular situation is the work of a licensed Arizona attorney.