Sharing the Road, Stopping Distance, Weather, Night, Impairment and Fitness: Bicyclists and the 3-Foot Rule, Motorcycles and Lane Filtering, Trucks and the No-Zone, Slow-Moving Vehicles, Perception and Reaction Time, Following Distance, Rural Roads, Wind, Sun Glare, Dust Storms, Rain, Flash Floods, Fog, Snow and Ice, Headlights and Night Driving, Wrong-Way Drivers, Alcohol, Marijuana and Drugs, Open Containers, Zero Tolerance, Aggressive Driving, Emotions, Medical Restrictions and Fatigue

Written for aiforu2 as the source for a practice-test bank and the on-device tutor for the Arizona driver license written test. The facts follow the official manual; the wording is ours.

Source: Arizona Driver License Manual and Customer Service Guide (ADOT MVD form 99-0117, revised March 2026), Section 4 "Sharing the Road with Other Vehicles" (pages 50–52) and Section 5 "Actively Avoiding Crashes", pages 53–61 (Braking and Stopping through Drowsy Driving).

Bicyclists

Bicyclists have the same laws and the same right-of-way as drivers. They ride with traffic near the right side but may legally move left to turn left, avoid hazards, pass pedestrians or vehicles, or when the lane is too narrow to share safely, so expect swerving. Drivers must leave a minimum of 3 feet when passing a bicyclist going the same way, and should not honk, which can startle a rider into a crash. Dim your headlights for bicyclists at night. Bicyclists must ride with traffic, carry no more people than the bike is designed for, ride no more than two abreast, keep right as far as practicable, use hand signals, never ride impaired, and at night show a white headlamp visible from 500 feet and a rear reflector.

Motorcycles

Most car-motorcycle crashes happen when a car turns in front of a motorcycle the driver did not see or misjudged. A motorcycle's small size makes it look farther away and slower than it is, and its single light gives fewer distance cues; rain and wind make it less stable. Riders may lane filter past stopped traffic in their lane when the street has at least two lanes the same direction, the posted limit is 45 mph or less, and the motorcycle goes no faster than 15 mph. At intersections do not assume a rider's intentions: riders shift within the lane to avoid oil, potholes and debris or to be seen, and their turn signals do not cancel automatically. A motorcycle is entitled to the full width of its lane; never crowd in beside one, and never return to the lane too soon after passing.

Trucks and slow vehicles

Never cut in front of a truck: it takes trucks twice as long to stop, and moving into that space halves its stopping distance. Stay out of the No-Zone blind spots around the front and back sides. Follow at a distance that lets you see and react. Trucks make wide right turns and may leave space to the right first, so never pass a truck on the right when it might turn. If you break down, get far off the highway; a truck can weigh as much as 25 cars. Farm machinery travels at 25 mph or less, may occupy more than one lane, may lack signals, and may pull left before a wide right turn; the orange triangle emblem on the back means the vehicle cannot exceed 25 mph and has the legal right to be there.

Braking and stopping

Braking distance depends on speed, perception time (average 0.75 seconds), reaction time (0.75 seconds), pavement, tires, vehicle weight and brakes; perceiving and reacting to a threat averages 1.5 seconds. Keep at least a 3-second following distance normally, and 3 to 6 seconds when needed: double it to 6 seconds or more on slippery roads, slow down to let a driver behind pass more quickly, and leave extra room behind a tractor-trailer that blocks your view. Rural highways bring animals, farm equipment over a crest and water in low spots; slow for curves and hills that hide the road.

Weather

The first rule in bad weather is to slow down for reduced visibility and reaction time. Wind, especially crosswinds, is dangerous for campers, RVs, trailers and light vehicles: slow down, expect gusts leaving sheltered areas and when meeting trucks and buses, move right and slow when a truck passes so a trailer does not sway or jackknife, and expect a tailwind to require earlier braking. Sun glare: sunglasses, clean windows and visors help, and remember oncoming drivers may not see your signals when the sun is behind you. Dust storms ("Pull Aside, Stay Alive") can cut visibility to zero: check traffic and slow immediately, drive completely off the highway and stop as far right as possible, never in the travel or emergency lane, turn off your lights, take your foot off the brake, stay belted inside, and wait for it to pass. Rain: wait a moment before using wipers on a dirty windshield, increase the gap to at least 6 seconds, and be most careful in the first 30 minutes when oil and grime make the road slick. Hydroplaning can lift tires off the road at 50 mph (lower with worn or underinflated tires); if it happens, ease off the accelerator, do not brake, avoid steering changes and hold the wheel until the tires grip. Never cross a flooded wash: water stalls engines, hides potholes and carries cars away; judge depth from parked cars, let one vehicle clear before another enters, drive through water slowly and steadily, and dry wet brakes by driving slowly with light left-foot pressure. Driving around flood barricades makes you liable for the emergency response costs. Fog: use low beams only, follow the edge markings, slow down, and if needed pull off, turn the lights off and wait. Snow and ice: use headlights, expect hidden lane markings and drivers hugging the center, add at least 6 seconds of stopping distance, and remember front tires that are rolling steer better than they brake; brake gently with rising pressure, and if the wheels lock ease off slightly without releasing. Avoid sudden changes, clear all snow from windows and lights, use snow tires or chains, slow before stopping or turning, and expect ice on bridges and in shade first.

Headlights and night driving

Use low beams whenever glare, rain or dust could hide you from others. Headlights are required from sunset to sunrise; turn them on, not the parking lights, as light fades. Never outdrive your lights: use low beams on city streets, high beams on highways when no vehicle approaches within 500 feet, low beams for oncoming traffic and within 200 feet of a vehicle you follow. Against undimmed high beams, glance toward the right edge and back until you pass. Fight highway hypnosis by stopping every hour to walk. Wrong-way drivers are usually impaired and travel in the left or HOV lane after entering from an off-ramp: leave space so you can react if the car ahead swerves, and if you see one coming on a divided highway ease off the gas, make sure no one is beside you, steer away, get somewhere safe and call 911. When overhead boards display "ALERT, WRONG-WAY DRIVER AHEAD," move to the nearest exit as soon as it is safe.

Alcohol, drugs and aggression

Alcohol, marijuana, medications and illegal drugs cut reflexes, control and hazard recognition while creating false confidence; check medication labels before driving. The open container law forbids a driver or passenger to consume or possess an open container of liquor in the passenger compartment on a public road, which includes any unlocked compartment within reach but not the trunk or the area behind the last upright seat of a trunkless vehicle; passengers in a bus, limousine, taxi or motor-home living area are exempt. Knowingly providing liquor to a minor can cost the provider's license up to 30 days for a first conviction and six months thereafter. Under 21 the rule is zero tolerance: any trace of alcohol or impairing drugs brings stiff penalties and a 2-year suspension. Being under 0.08 BAC does not make driving legal or safe; alcohol impairs well below that level, and crash involvement peaks at ages 21 to 34. Aggressive driving is a citation for committing, in one continuous period, an immediate hazard to another person while exceeding the speed limit and committing two of: failing to obey signs or signals, passing on the right, an unsafe lane change, following too closely, or failing to yield to emergency vehicles. A first offense means Traffic Survival School and a possible 30-day suspension; a second within 24 months is a Class 1 misdemeanor with a 12-month suspension. Anger, excitement, worry and depression all degrade driving; wait until you are calm.

Fitness and fatigue

Even a headache or cold can affect driving; postpone the trip or let someone else drive. Any condition that could affect safe driving must be reported to MVD; a seizure within 90 days of applying must be reported, and a licensed driver who has a seizure or similar condition must stop driving, notify MVD and have a medical exam. Feeling sleepy means you should already be off the road. Shift workers, business travelers, commercial drivers, people with sleep disorders and young people are most at risk. Rest is the only remedy: sleep before long trips, avoid late-night driving, take frequent stops to exercise and breathe, keep your eyes moving, use fresh air, the radio or gum, and change drivers when possible.

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