Arizona speed limits default to 25 miles per hour in business and residential districts and 65 miles per hour on other roads where no sign is posted, and rural interstates can be posted as high as 75 mph. Those numbers are only the starting point. State law also lets officers ticket you for driving too fast for conditions even when you’re under the posted limit, and penalties climb sharply once you exceed the sign by more than 20 mph.
Default Limits When No Sign Is Posted
Not every Arizona road carries a speed limit sign. ARS 28-701(B) fills the gap with three statewide defaults:1Arizona Legislature. Arizona Code 28-701 – Reasonable and Prudent Speed; Prima Facie Evidence; Exceptions
- 15 mph approaching a school crossing
- 25 mph in any business or residential district
- 65 mph everywhere else
These are “prima facie” limits. Driving faster is treated as presumptive evidence that you were going too fast, and while you can theoretically argue a higher speed was safe for the circumstances, that’s a hard case to win.
The Basic Speed Rule
ARS 28-701(A) requires every driver to travel at a speed that is reasonable and safe for current conditions, regardless of the posted number. If you’re doing 60 in a 65 zone during a monsoon with near-zero visibility, you can still be cited. The statute specifically flags intersections, railroad crossings, curves with limited sight distance, and narrow or hazardous stretches as places where you’re expected to slow down below the sign.
Interstate Highway Limits
ARS 28-702.04 sets the baseline speed on interstates outside urbanized areas at 65 mph, and gives the ADOT director authority to raise individual rural interstates (or all of them) to 75 mph.2Arizona Legislature. Arizona Code 28-702.04 – Maximum Speed Limit on Interstate Highways Outside Urbanized Areas and Within Certain Counties Most rural interstate miles in Arizona are posted at 75.
“Urbanized area” tracks the U.S. Census Bureau’s decennial figures, generally meaning populations of 50,000 or more. Inside those zones the director can declare lower limits, which is why interstates drop to 55 or 65 mph as you approach Phoenix, Tucson, and other metro areas.
School Zone Limits
Arizona’s 15 mph school zone rule is narrower than most drivers think. Under ARS 28-797, the 15 mph limit applies only to elementary and middle schools (kindergarten through eighth grade) at authorized crossings, and it kicks in only when portable signs are physically placed in the street by crossing guards or school staff. When the portable signs aren’t out, the regular posted speed applies.3Department of Transportation. Arizona School Zones Aim to Provide Safe Crossings
The first portable sign you see reads “NO PASSING, 15 MPH, FINES DOUBLED, SCHOOL IN SESSION,” and marks where the zone begins. Between that sign and the crosswalk, you cannot pass another vehicle even if it has stopped or slowed below 15 mph. School zones also cannot be established at intersections already controlled by stop signs or traffic signals.
Exceeding 35 mph while approaching a school crossing is criminal speeding, which carries potential jail time. On roads where the non-school posted limit is 40 or 45 mph, that threshold is easier to hit than drivers expect.
Work Zones
Speeding in a state highway work zone with workers present doubles the financial penalty. Under ARS 28-710, the court imposes the standard civil penalty plus an additional assessment equal to that penalty.4Arizona Legislature. Arizona Code 28-710 – State Highway Work Zone Safety; Civil Penalty; Fund The work zone must be marked with traffic control devices showing where it starts and ends. Failing to pay the additional assessment is treated like any other unpaid civil penalty, meaning the state can act against your license.
What a Civil Speeding Ticket Costs
Most Arizona speeding tickets are civil traffic violations. The base fine varies by court, and mandatory state surcharges push the total well above whatever number is printed on the citation.
A civil speeding conviction also adds 3 points to your driving record.5Department of Transportation. Points Assessment Accumulating 8 or more points in any 12-month window can trigger Traffic Survival School or a license suspension of up to 12 months. One speeding ticket alone won’t get you there, but combined with other moving violations it adds up quickly.
The “Waste of a Finite Resource” Break
ARS 28-702.01 is one of the most driver-friendly provisions in Arizona traffic law. If you’re caught no more than 10 mph over the posted limit on a highway posted at 30 mph or higher outside an urbanized area (or 40 mph or higher inside one), the violation can be classified as a “waste of a finite resource” instead of standard speeding.6Arizona Legislature. Arizona Code 28-702.01 – Waste of a Finite Resource; Civil Penalties; Urbanized Areas; Definition
The maximum base penalty is $15 plus court surcharges. The state cannot use it to suspend or revoke your license, the court will not report it to MVD, and your insurance company is prohibited from treating it as a moving violation for rate purposes.
Criminal Speeding
Arizona draws a hard line between civil and criminal speeding. Under ARS 28-701.02, you commit criminal speeding in three situations:7Arizona Legislature. Arizona Code 28-701.02 – Excessive Speeds; Classification
- Exceeding 35 mph while approaching a school crossing
- In a business or residential district, exceeding the posted limit by more than 20 mph, or exceeding 45 mph where no limit is posted
- Anywhere else, exceeding the posted limit by more than 20 mph
Criminal speeding is a class 3 misdemeanor, punishable by up to 30 days in jail and a fine of up to $500.8Arizona Legislature. Arizona Code 13-707 – Misdemeanors; Sentencing9Arizona Legislature. Arizona Code 13-802 – Fines A conviction goes on your criminal record, not just your driving record. Doing 46 in a 25 zone or 86 in a 65 zone both qualify, and prosecutors don’t have to prove reckless driving. The speed by itself is enough.
Defensive Driving School
Arizona gives most drivers a path to make a speeding ticket go away entirely. Under ARS 28-3392, courts must allow eligible drivers to attend defensive driving school for civil traffic moving violations, and may allow it even for criminal speeding charges. Complete the course and the court dismisses the citation; MVD will not add it to your record.10Arizona Judicial Branch. Defensive Driving Legislation
The main restriction is frequency. You can only use the option once every 12 months, measured from the date of the previous violation you were authorized to attend for. You must complete the course at least 7 days before your court date, and it covers only one citation at a time. Courses run online or in person unless a judge orders in-person attendance.11Arizona Judicial Branch. Defensive Driving Schools
Drivers involved in a collision causing serious injury or death are not eligible. CDL holders face a different rule: a court may order defensive driving school as part of the sentence, but the conviction is still reported to MVD and cannot be dismissed through diversion.
Photo Enforcement and When a Camera Ticket Can Be Dismissed
Arizona permits fixed and mobile photo enforcement, but signage rules are strict. A fixed system requires at least two warning signs before the camera: one roughly 300 feet before the system and at least one more than 300 feet ahead, with a speed limit sign posted between them.12Arizona Legislature. Arizona Code 28-1204 – Photo Enforcement Zones; Signage; Standards; Citation Dismissal
If a system is shut down for more than 24 hours, the warning signs must be removed or covered. A photo enforcement vehicle must be clearly marked on the rear as such. Mobile units on roads posted at 40 mph or less are exempt from the two-sign requirement. If any of these standards aren’t met while the system is operating, the court may dismiss the citation.