How to Handle a Flat Tire on the Highway in Montreal
A flat tire at 100 km/h on the Metropolitan Expressway is one of the most terrifying experiences a Montreal driver can face. The steering wheel jerks, the car pulls hard to one side, and you have seconds to react while surrounded by fast-moving traffic. Whether it is a slow leak that finally gave out or a sudden blowout caused by one of Montreal’s infamous potholes, knowing exactly what to do — and what not to do — can mean the difference between a minor inconvenience and a life-threatening situation. This guide covers everything you need to handle a flat tire on any Montreal highway safely.
🚨 Emergency Quick Guide
Step 1: Do NOT slam the brakes. Grip the wheel firmly and ease off the accelerator gradually.
Step 2: Signal right and coast to the widest part of the shoulder. Stop on flat, firm ground if possible.
Step 3: Turn on hazard lights. Stay inside your vehicle with your seatbelt on.
Step 4: On a Montreal expressway → call *4141. On city streets → call (514) 483-6944 for immediate mobile tire change.
How to Recognize a Flat Tire While Driving on the Highway
Not every flat tire announces itself with a dramatic bang. In fact, slow leaks are more common than blowouts and can be harder to detect at highway speed. Here are the warning signs:
If you notice any of these signs, do not ignore them. A slow leak at 100 km/h can become a catastrophic blowout in minutes. React immediately using the steps below.
Step-by-Step: What to Do When You Get a Flat Tire at Highway Speed
Your first instinct will be to slam the brakes. Do not do that. A sudden stop on a deflated tire at high speed can cause you to spin out, especially on wet or icy pavement. Here is the correct sequence:
Grip the Wheel and Ease Off the Gas
Hold the steering wheel firmly with both hands at 10 and 2. The car will want to pull — fight the drift gently, but do not overcorrect. Slowly release the accelerator and let the car decelerate on its own. Do not brake suddenly.
Activate Your Hazard Lights Immediately
Alert every vehicle behind you that something is wrong. On Montreal expressways where traffic often travels bumper-to-bumper, this early warning can prevent a rear-end chain reaction.
Steer Toward the Right Shoulder
Signal right and carefully move across lanes toward the shoulder. Look for the widest, flattest spot available. If you can see an exit ramp or rest area nearby, aim for that — it is far safer than a narrow shoulder. Avoid stopping on curves or near overpasses where visibility is limited.
Apply Brakes Gently Once Below 30 km/h
Once your speed has dropped significantly, you can begin braking gently to come to a complete stop. Stop on firm, level ground — gravel shoulders are acceptable, but avoid soft mud or sand where the jack could sink.
Stay in Your Vehicle — Do Not Exit on the Highway
This is critical. On Quebec expressways, it is illegal to exit your vehicle if you stall or break down. Stay inside with your seatbelt on and doors locked. The risk of being struck by passing traffic on a highway shoulder is extremely high — pedestrians on highway shoulders are involved in hundreds of fatal collisions across Canada every year.
Call for Help
On an expressway: Call *4141 from your cell phone or 310-4141 from a landline. This connects you to the exclusive towing service. On city streets: Call Montreal Towing at (514) 483-6944 for a mobile tire change or tow.
What NOT to Do With a Flat Tire on the Highway
Panic leads to dangerous decisions. Memorize these common mistakes so your instincts do not betray you:
🚫 NEVER Do This
Slam the brakes — causes spin-outs on a flat, especially rear tires
Exit the vehicle on a highway — illegal in Quebec and extremely dangerous
Try to change the tire yourself on the highway shoulder — passing vehicles are inches away
Drive on a completely flat tire — destroys the rim and tire permanently
Stop in a travel lane — keep coasting until you reach a shoulder or exit
✅ ALWAYS Do This
Grip the wheel firmly — maintain control as the car pulls
Stay in the car — seatbelt on, doors locked, hazards flashing
Call *4141 or (514) 483-6944 — let professionals handle the roadside work
Coast to the widest shoulder or exit — more space = more safety
Ease off the gas gradually — controlled deceleration is the safest method
⚠️ Montreal-Specific Danger: The Metropolitan Expressway and Décarie Expressway have notoriously narrow shoulders — some sections have no shoulder at all. If you cannot safely pull over, keep your hazards on, reduce speed as much as safely possible, and call 911 immediately. The dispatcher will send police to block the lane and an exclusive tow truck to your location.
Who to Call for a Flat Tire in Montreal (Highway vs City)
Who you call depends on where your flat tire happened. Montreal has specific rules about this — and calling the wrong number can cost you time and money.
For a full explanation of which towing rules apply where, read our complete guide to Montreal’s exclusive towing zones.
Flat Tire on a Montreal Street? We Come to You.
Mobile tire change — 24/7, rain or shine, summer or winter.
(514) 483-6944
Should You Change a Flat Tire Yourself on the Highway?
On a quiet residential street with a wide shoulder and low traffic — maybe. On a Montreal highway — almost never. Here is why:
Traffic is dangerously close. On most Montreal expressways, the travel lane is just metres from the shoulder. Vehicles passing at 100+ km/h create turbulence that can knock you off balance, and distracted drivers may not see you until it is too late.
Uneven or soft shoulders. Gravel, mud, ice, and sloped surfaces can cause a jack to slip. A car falling off a jack while you are underneath is catastrophic.
It is legally restricted. On Quebec expressways, you are not supposed to exit your vehicle unless absolutely necessary. The Ministère des Transports explicitly recommends staying inside and calling *4141.
Night, rain, or winter conditions make it exponentially more dangerous. Reduced visibility, wet hands, frozen lug nuts, and icy surfaces turn a difficult job into a nearly impossible one. If you get a flat tire in bad conditions, calling a professional mobile tire change service is the only safe option.
💡 When DIY Is Reasonable: If you are on a wide, flat, well-lit surface with low-speed traffic — like a service road or large parking lot — and you have the tools, the spare, and the knowledge, changing your own tire is a viable option. But always position the vehicle so the flat tire is on the side away from traffic.
Blowout vs Slow Leak: Different Situations, Different Responses
Not every flat tire happens the same way, and your response should match the situation:
💥 Sudden Blowout
• Loud bang or explosion sound
• Immediate loss of control / swerving
• Car drops sharply on one corner
• Tire is completely destroyed — shredded rubber on the road
Response: Grip wheel → do NOT brake → coast to shoulder → hazards → call for help. Tire is not repairable — you need a new tire or spare installation.
🔵 Slow Leak
• Gradual pulling to one side
• TPMS warning light illuminates
• “Soft” or spongy steering feel
• Visible object embedded in tread (nail, screw)
Response: Exit highway at next opportunity → stop safely → assess damage. If air loss is gradual, you may be able to reach a tire shop. If tire is nearly flat, stop and call for help immediately.
Whether it is a blowout or a slow leak, the damaged tire will eventually need either repair or replacement. Our tire repair vs replacement guide explains exactly how to decide which one your tire needs based on the type and location of the damage.
Top Causes of Flat Tires on Montreal Highways
Montreal’s roads are uniquely hard on tires. Understanding the common causes can help you prevent a highway flat tire before it happens:
Potholes — Montreal’s freeze-thaw cycles create some of the worst potholes in North America. Hitting a deep pothole at highway speed can puncture a tire instantly, crack the sidewall, or cause internal belt separation that leads to a delayed blowout. The city reports hundreds of thousands of pothole complaints annually.
Construction debris — Nails, screws, metal fragments, and broken glass are common on Montreal highways, especially during the construction season that seems to run almost year-round. These objects embed in your tread and cause slow leaks that worsen over time.
Underinflation — Tire pressure drops about 1 PSI for every 5°C temperature drop. A tire properly inflated in September can be dangerously low by January. Underinflated tires overheat at highway speed and are far more susceptible to blowouts.
Worn tread — Tires with tread below 4/32″ have significantly reduced puncture resistance. Quebec requires winter tires with adequate tread from December 1 to March 15 — but worn tires are dangerous year-round.
Tire age — Rubber degrades over time. Tires older than 6 years become brittle and crack-prone, even if the tread looks fine. Check the DOT date code on your tire’s sidewall — the last four digits show the week and year of manufacture.
After the Flat: What to Do Next
Once you are safely off the highway with a spare installed (or your car has been towed), you still have a few important steps:
📋 Post–Flat Tire Checklist
☐ If on a donut spare: max speed 80 km/h, max distance 100 km
☐ Visit a tire shop within 24–48 hours for repair or replacement
☐ Have the flat tire inspected — is it repairable or junk?
☐ If you hit a pothole, inspect for rim damage and alignment issues
☐ Check the other three tires for damage — potholes can hurt multiple tires
☐ Re-inflate your spare to the correct pressure after use
☐ Save your towing/service receipt for a potential insurance claim
☐ Restock your emergency kit if you used any supplies
☐ Consider pothole damage claim through the City of Montreal (if applicable)
How to Prevent Flat Tires on Montreal Highways
You cannot avoid every pothole or road hazard, but regular maintenance dramatically reduces your risk of a highway flat tire:
Check tire pressure every two weeks. Use a digital gauge — the reading should match the PSI listed on the sticker inside your driver’s door jamb, not the number on the tire sidewall. This is especially important in winter when pressure drops with temperature.
Inspect your tires visually every week. Look for nails, screws, cracks, bulges, and uneven wear. Catch problems before they become blowouts.
Replace tires before they are worn out. Do not wait until tread hits 2/32″. Replace at 4/32″ for wet-road safety and 6/32″ if you drive on snow. Use the Canadian quarter test to check.
Avoid potholes when safe to do so. Keep extra following distance so you can spot and steer around potholes. If you cannot avoid one, slow down as much as safely possible before impact — do not brake while going through it.
Rotate your tires every 8,000–10,000 km. Even wear extends tire life and maintains balanced handling. Uneven tread wear is a common precursor to blowouts.
Related Services for Highway Emergencies
A flat tire is just one of many things that can go wrong on a Montreal highway. Here are other services we provide around the clock:
🚛 Flatbed towing — For vehicles with no spare, rim damage, or multiple flats that cannot be driven.
🔋 Battery boost — Dead batteries and flat tires are Montreal’s two most common roadside calls.
🪢 Winching and recovery — If a blowout sent you off the road or into a ditch.
🚗 Breakdown towing — Engine failure, overheating, or transmission problems on the highway.
⛽ Fuel delivery — Ran out of gas on the highway? We bring fuel directly to your vehicle.
Learn more about our complete roadside assistance and 24-hour emergency towing services, or check our complete towing cost guide for transparent pricing.
Frequently Asked Questions: Flat Tires on Montreal Highways
What should I do first when I get a flat tire on the highway?
Do not slam the brakes. Grip the steering wheel firmly, ease off the accelerator, turn on your hazard lights, and gradually steer toward the right shoulder. Once you are safely stopped, stay in your vehicle and call *4141 if you are on a Montreal expressway, or (514) 483-6944 if you are on a city street.
Is it legal to change a tire on a Quebec expressway shoulder?
The Ministère des Transports advises against exiting your vehicle on a Quebec expressway. The official recommendation is to stay inside with your seatbelt fastened and call *4141 for the exclusive towing service. Changing a tire yourself on a highway shoulder puts you at extreme risk from passing traffic and is strongly discouraged by road safety authorities.
How far can I drive on a flat tire?
Ideally, zero distance. Driving on a completely flat tire destroys the tire within 1 to 2 kilometres and can permanently damage the wheel rim, costing $200 to $800 or more. If you have a slow leak and the tire is still partially inflated, you may be able to reach the next exit or a safe pull-off — but do so at very low speed and only if the distance is short.
What is *4141 and do I have to call it for a flat tire?
*4141 is the exclusive towing hotline for Montreal-area expressways, operated under the Ministère des Transports. If your vehicle is disabled on a highway, you are required to use this service. The operator dispatches the contracted tow truck along with a protection vehicle that blocks the lane behind you for safety. Rates are government-regulated.
How much does roadside tire change cost on a Montreal highway?
If you call *4141 on an expressway, the rate is set by the Quebec government. On city streets, Montreal Towing’s mobile tire change service starts at $99. The exact cost depends on your location, time of day, and vehicle type. Most accident-related tire services are covered by your auto insurance.
Can a tire blowout cause an accident?
Yes. A sudden blowout at highway speed causes immediate loss of vehicle control. The car can swerve violently, especially if a front tire blows. Maintaining proper tire pressure, replacing worn tires, and avoiding overloaded vehicles are the best prevention measures. If a blowout does occur, gripping the wheel and gradually decelerating is far safer than braking hard.
What if there is no shoulder on the highway when I get a flat?
Some Montreal expressways — particularly the Metropolitan and parts of Décarie — have minimal or no shoulders. If you cannot safely pull over, keep your hazard lights on, reduce speed gradually, and call 911 immediately. Police will respond and block the lane so a tow truck can safely reach you. Do not stop in a travel lane if you can avoid it.
Does insurance cover a flat tire on the highway?
If the flat tire was caused by a collision or road hazard, the towing and tire change may be covered under your auto insurance. If you have a roadside assistance endorsement, the service call is typically covered regardless of cause. For full details, check our guide to insurance towing in Quebec.
Can potholes cause a flat tire?
Absolutely. Deep potholes can puncture the tread, crack the sidewall, cause immediate blowouts, or create internal belt separation that leads to a delayed failure. Montreal’s freeze-thaw climate makes potholes a year-round hazard, but they are most severe in spring. If you hit a pothole hard, inspect all four tires for damage as soon as possible.
Where can I find a tire change near me in Montreal right now?
If you are on a Montreal street or in a parking lot, call Montreal Towing at (514) 483-6944 for immediate mobile tire change service. We dispatch the nearest available technician to your location 24/7. Average arrival time is 20 to 40 minutes depending on your neighbourhood and traffic conditions.
Stranded With a Flat? Help Is Minutes Away.
Mobile tire change. Flatbed towing. Full roadside assistance.
24/7 across Montreal — expressways, city streets, and parking lots.
(514) 483-6944