SAFETY GUIDES · PHOENIX, AZ
What Do You Do When a Tire Blows Out at Highway Speed?
Updated October 2026 · Written by the techs at The Junkie Garage
The short answer
A tire blowout at 70 mph takes about half a second to announce itself: a loud bang, a violent pull toward the dead tire, and a heavy vibration or flapping sound. The correct response goes against instinct — do not slam the brakes. Grip the wheel firmly with both hands, hold the car straight, let it slow gradually by lifting off the gas, and steer gently toward the shoulder only after speed has come down. Braking hard on a blown tire is the fastest way to lose control.
The moment of the blow, step by step
First: firm grip, both hands, at the 9-and-3 positions — the car will try to pull hard toward the blown side and the wheel will fight you. Second: do not brake; the uneven grip between the good tires and the shredded one will spin the car under hard braking. Third: lift off the accelerator completely and let engine drag and the dead tire's resistance slow the car; you can gently feather the brake once you're below roughly 30 mph. Fourth: turn your blinker on and steer smoothly — not sharply — off the pavement. Fifth: stop as far onto the shoulder as you can safely get, hazards on.
Off the road: the hazards after the stop
Arizona highways are the most dangerous place to stand outside a car. Stay belted inside with hazards running while you call for help — it is a legitimate roadside-assistance call, not an admission of weakness. If you must get out for any reason, exit on the side away from traffic. If you plan to change it yourself, only on quiet roads, well off the pavement, on level ground with the parking brake set — and never on the left (traffic) side of a busy highway. A gentle-used tire's condition is worth checking at your next visit: heat, age, and underinflation are the classic blowout recipe in Phoenix.
Get repair helpAffordable, community-based help when a repair is out of reach.What causes blowouts — and how to prevent them
Underinflation is the leading cause: a soft tire flexes, overheats, and its sidewall gives way, often after dozens of miles of heat load — which is why Arizona blowouts cluster in summer. Age is the second: rubber dries and cracks with time even with good tread (look for fine cracks in the sidewall and between tread grooves). Overloading, road hazards, and a previously repaired-but-degraded tire round out the list. Prevention is unglamorous and effective: check pressures monthly when the tires are cold (including the spare), keep them set to the placard on the driver's door jamb, and replace any tire over 10 years old or showing sidewall cracking regardless of tread depth.
How we're redefining community supportSee how The Junkie Garage keeps Phoenix families on the road.Frequently asked questions
Why can't I brake hard during a blowout?
A blown tire has a fraction of the grip of the other three, so hard braking makes the car rotate toward the dead side and can trigger a full spin. Letting the car slow on its own first keeps the tires' grip balanced enough for you to steer to a stop.
Can a blowout be fixed, or do I need a new tire?
A true blowout usually destroys the sidewall and often the rim's sealing surface — it needs replacement, not a repair. A puncture repair (plug or patch) is only appropriate for small tread-area holes; sidewall damage is never repairable.
How do I know if my tire is close to blowing?
Warning signs: visible sidewall bulges or bubbles, cracks between tread blocks or on the sidewall, tread separating or chunking off, a tire that keeps losing pressure, and vibration that appears at speed. Any of those deserves an inspection this week.
Does my spare tire expire?
Yes — spares age like any tire, and most need replacing by 10 years. A donut spare also has strict speed (typically 50 mph) and distance limits. If your spare has never been checked, it's probably soft: underinflated spares are the norm when drivers only check the four on the car.
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