Arizona Driving Laws 2026: Speed Limits, DUI BAC and Road Rules for the Written Test

What is the default speed limit in Arizona when no sign is posted on a highway? Arizona sets 65 mph on most highways and 75 mph on rural interstates where posted. The MVD written test is 30 questions with a 80% pass requirement. Arizona DUI law is strict: 0.08% for adults, 0.00% for drivers under 21, and an Extreme DUI classification at 0.15% or higher with mandatory jail time. Headlights are required 30 minutes after sunset and any time visibility is less than 1000 feet.

1. Speed Limits in Arizona

Arizona law sets default speed limits by zone type, they apply whether or not a sign is posted. From a Phoenix alley to a rural Sonoran Desert freeway, here is the statutory ceiling for each location:

Key test point: White speed limit signs are regulatory, the maximum you can legally drive. Orange speed signs indicate recommended safe speeds for curves or grades. Arizonas dust storms and monsoon rain can drop visibility to zero; you must always be able to stop within the distance you can see ahead.

2. Right-of-Way: Who Goes First

Arizonas MVD exam hits right-of-way hard, especially pedestrian crossings, merging onto freeways, and 4-way stops. The core principle does not change: right-of-way is something you yield, not something you claim.

4-way stop (all arrive at once)

Driver to the right

4-way stop (one arrives first)

Driver who arrived first

Roundabout / traffic circle

Vehicles already inside the circle

Emergency vehicles (lights/siren)

Emergency vehicle, pull to the right and stop

Pedestrians in crosswalk

Pedestrians always

T-intersection (no signs)

Through road traffic; drivers on the dead-end must yield

Yield sign

Cross traffic and pedestrians always

Merging onto a highway

Traffic already on the highway

3. Turns & Signal Laws

Arizona law requires you to signal at least 100 feet before any turn, approximately 4 seconds of travel time. Right turns on red are generally permitted after a full stop. Heres how every intersection and turn scenario breaks down:

Right turn on red

Permitted after a full stop unless a sign prohibits it. Yield to pedestrians and cross traffic.

No right turn on red

When posted, you must wait for a green light before turning right.

Left turn on red

Only allowed from a one-way street onto another one-way street, after a full stop.

Left turn from two-way street

Start from the left lane; end in the left lane of the cross street.

Right turn

Stay as close to the right curb as possible; end in the right lane.

U-turns

Legal where not prohibited by a sign; must not interfere with traffic. Illegal where signs prohibit it; must not create a hazard. In Arizona, never make a U-turn on a curve, near a hill crest, or at any location where you cannot be seen by traffic within 500 feet.

4. Lane Rules & Line Markings

Arizona has dense urban freeway networks in Phoenix and Tucson and long open two-lane stretches through the desert. Lane rules, which line you can cross, when you can change lanes, and how the center turn lane works, are tested every time on the MVD exam.

Center turn lane (CTSL)

Used only to begin or complete a left turn; not for through travel or merging. You may travel no more than 300 feet in the CTSL.

Solid white line

Do not cross; marks the edge of the road or a lane that should not be changed.

Solid yellow line (your side)

No passing allowed.

Broken yellow line

Passing allowed when safe.

Solid + Broken yellow centerline

Passing allowed only on the broken-line side.

5. Passing Another Vehicle

On Arizonas long desert highways between Phoenix, Tucson, and Flagstaff, passing temptation is constant, but the rules are strict. Heres when passing is illegal and what distances the law requires:

• Only pass on the left, using the oncoming lane, when it is safe and legal.
• Do not pass within 100 feet of an intersection, railroad crossing, bridge, or curve where your view is limited. Look for the No Passing Zone pennant sign.
• The vehicle being passed must not speed up while you are overtaking.
• Return to your lane before coming within 200 feet of oncoming traffic.
• Never pass a stopped school bus with flashing red lights, this applies in both directions on undivided roads.
• You may pass on the right only when the vehicle ahead is turning left and there is a usable lane to the right.

6. Following Distance

Arizonas monsoon season brings sudden downpours that turn dry washes into rivers. Dust storms can cut visibility to zero in seconds. The 3-second rule is your baseline under normal conditions, pick a fixed point, watch the car ahead pass it, do not reach it yourself for at least 3 seconds.

7. School Buses & Emergency Vehicles

Do you have to stop for a school bus on a divided Arizona road, and what does the Move Over law actually require? Both come up on the MVD knowledge test. Get them right.

School Buses

• When a school bus stops with flashing red lights and an extended stop arm, all traffic in both directions must stop on undivided roads.
• On roads with a true median or physical barrier, only traffic behind the bus must stop, oncoming traffic may proceed.
• A center turn lane does not count as a divider. On 4+ lane roads without a raised median or barrier, all directions must stop.
• You must remain stopped until the red lights stop flashing and the stop arm is retracted.
• Illegally passing a stopped school bus in Arizona carries 3 points on your driving record and possible suspension, plus criminal traffic violation charges.
• Railroad crossings: School buses must stop at ALL railroad crossings, with or without passengers, even if no lights are flashing and no train is visible. This is a frequently tested rule.

Emergency Vehicles

• When you see or hear an emergency vehicle (police, fire, ambulance) with lights or siren: pull to the right edge of the road and stop. Do not block intersections.
• Move Over Law (Arizona): When passing a stopped emergency vehicle, tow truck, or highway maintenance vehicle on a multi-lane road, move one lane away if safe. If you cannot change lanes, slow to a safe speed. Violation is a civil traffic offense.

8. DUI Laws: Extreme DUI at 0.15%

Arizona has three tiers of DUI, standard, Extreme (0.15+), and Aggravated, each with escalating mandatory jail time and fines. There is no wiggle room on implied consent either: refusing a test costs you 12 months on the spot, before any court conviction.

9. Seat Belts & Child Seats

Arizona law puts responsibility for everyone under 16 squarely on the driver. Children under 5 must be in a child restraint system, no exceptions. Heres the full breakdown:

10. Where You Cannot Park

Arizona adds a few location-specific rules you will not find in other states, including a blanket ban on parking on any freeway or interstate except during an emergency. Heres the full list of places you cannot park:

• Within 15 feet of a fire hydrant
• Within 20 feet of a crosswalk at an intersection
• Within 30 feet of a stop sign, yield sign, or traffic signal
• Within 50 feet of a railroad crossing
• On a sidewalk, in front of a driveway, or on a bridge
• In a no-parking zone or alongside a curb painted yellow or red
• Double parking (alongside a vehicle already parked at the curb)
• Headed downhill: turn wheels toward the curb. Headed uphill with a curb: turn wheels away from curb. Uphill without a curb: turn wheels toward the shoulder.

11. Driving in Bad Weather

Arizona weather hazards are unlike most other states. Summer monsoon season brings blinding dust storms (haboobs) and flash floods that can sweep vehicles off roads. A dry wash can fill with water in minutes, "Turn Around, Dont Drown" is a real policy, not a slogan.

• Turn on low beam headlights in sun glare, rain, dust, or any condition where visibility is reduced, even during daytime.
• In heavy fog, use low beams, high beams reflect off fog and reduce visibility.
• If you start to hydroplane, ease off the gas gently. Do not brake hard or turn sharply.
• In icy conditions, brake gently well in advance. Start slowing earlier than normal. Leave extra following distance.
• If your car goes into a skid, steer in the direction you want the front of the car to go. Do not overcorrect.
• Never use cruise control on wet, icy, or slippery roads.

12. License Points

In Arizona, hitting 8 points in any 12-month period triggers mandatory attendance at Traffic Survival School (TSS), or your license gets suspended. The MVD tracks every conviction on your permanent record. Heres exactly how points stack up:

Note: Completing a Traffic Survival School (TSS) course is mandatory when you reach 8+ points. Running a red light (including flashing red) also carries a mandatory TSS requirement regardless of total point count.

13. Headlight Rules

Arizonas wide-open highways make high beams tempting, but the law sets firm distances for when you must dim them. The 500-foot oncoming and 200-foot following rules are standard MVD exam material:

Key test point: Oncoming = dim at 500 feet. Following = dim at 200 feet. Arizonas following distance threshold is 200 feet, not 300. This is the number most test-takers get wrong.

14. Night Driving

Arizonas open desert highways create a false sense of safety at night, straight roads, light traffic, but reduced visibility and unpredictable wildlife. Heres what the MVD handbook says about safe night driving:

15. Cell Phones & Distracted Driving

Arizona enacted a statewide hands-free driving law, handheld phone use while driving is prohibited for all drivers. Distracted driving causes crashes, injury, and death, and Arizonas MVD handbook is explicit about it:

Key test point: Arizonas hands-free law applies to all drivers, handheld phone use is prohibited even at a red light. Fastening a seat belt while driving is also specifically listed in the MVD handbook as a distracted driving behavior.

16. Railroad Crossings

Arizonas rail network includes freight lines cutting through Phoenix, Tucson, and across remote desert stretches. The MVD tests railroad crossing rules directly, especially the stop distance and what vehicles must always stop regardless of signals.

Key test point: Never drive around or under a lowered crossing gate, it is illegal and extremely dangerous. Wait until gates are fully raised and all tracks are clear.

17. How to Drive a Roundabout

Roundabouts are appearing in Arizonas growing suburban corridors, especially in the East Valley and Tucson metro. The MVD tests them directly. The rule every test-taker misses: you yield every single time when entering, no matter what.

Key test point: The most common wrong answer on roundabout questions is thinking you have right-of-way when entering. You never do, yield to traffic already inside.