“Contributing Factor” Isn’t the Same as “Cause”

Quick but important clarification before any of the numbers below mean anything: Canada doesn’t publish an official “top 10 causes of crashes” list, and you’ll see plenty of websites that imply otherwise. What actually exists is police-reported contributing factors: the things an officer believed played a role in a specific collision. Multiple contributing factors can be recorded for the same collision, so the percentages below don’t add up to 100%. That’s not an error. It’s exactly how Transport Canada itself describes the data.

The National Picture: What Shows Up in Fatal Crashes

Here’s what police most often recorded as a contributing factor when someone was killed in a 2023 crash:

Why a Fatal Crash and a Fender-Bender Aren’t the Same Story

Here’s the part that surprises most people: the behaviours behind the worst crashes aren’t necessarily the behaviours behind the most crashes, and it’s not just “the same factors, slightly less often.” Ontario’s Ministry of Transportation publishes exactly the kind of severity-stratified breakdown that makes this visible: driver actions and conditions recorded separately for fatal, injury, and property-damage collisions, across the province where the largest share of DriveReady’s drivers are actually testing.

Two very different stories in that data. Speed and impairment both climb sharply as severity increases. Impairment alone jumps from under 2% of property-damage collisions to nearly 1 in 5 fatal ones. Distraction and following too closely don’t behave that way at all: they’re roughly as common in a fender-bender as anywhere else, without spiking specifically in the worst outcomes. That doesn’t make distraction less worth worrying about. If anything, it means its risk is constant, showing up on every single drive rather than only in worst-case moments.

Speed, Distraction, and Impairment: The Big Three

Add it all up, national and provincial data together, and three behaviours keep coming back as the ones actually worth building real habits around:

• Speed doesn’t just make a crash more likely. It makes whatever crash happens worse. In Ontario’s data it goes from a factor in 3.4% of property-damage collisions to 13.9% of fatal ones. A few extra km/h meaningfully changes stopping distance and impact force.
• Distraction doesn’t concentrate in the worst-case crashes the way speed and impairment do. It’s almost exactly as common in a fender-bender as anywhere else. That’s precisely what makes it worth prioritizing: it’s a constant risk on every single drive, not something that only matters in a worst-case moment. See our guide on distracted driving for what it actually costs you, in fines and otherwise.
• Impairment is entirely preventable, and its consequences are severe. In Ontario it was recorded in under 2% of property-damage collisions but nearly 1 in 5 fatal ones, the sharpest jump of any factor in this guide. Our impaired driving guide covers the law and the reasoning behind zero tolerance.

Notice something: none of these three are exotic, complicated failures. They’re ordinary choices, made a little carelessly, over and over. That’s actually good news: it means they’re also the most coachable things about driving, which is exactly why a coach in the passenger seat watching for them in real time is worth more than any amount of reading about them afterward.

“Towards Zero”: Why It’s Not Just a Slogan

You may have heard the phrase “Vision Zero” before. It remains a real, active influence on road safety policy across Canada in 2026, just under a slightly evolved name at the national level. Canada’s current national plan, Road Safety Strategy 2035+, is grounded in the same core idea: everybody’s going to make mistakes sometimes. That’s just true of being human. But nobody should die or get seriously hurt because of it. Its guiding vision is officially called “Towards Zero,” built on the Safe System Approach: roads, vehicles, speeds, and enforcement should all work together to catch human error before it turns into a tragedy, rather than just blaming the driver after the fact.

This isn’t just federal paperwork, either. It’s active at the city level right across the country. Edmonton was actually the first city in Canada to officially adopt Vision Zero, back in 2015, and is aiming for zero traffic deaths and serious injuries by 2032. Toronto runs its own Vision Zero Road Safety Plan with real annual progress reports. Vancouver has its own “Moving Towards Zero” plan. Three different provinces, same underlying idea. It’s honestly the same logic behind Supervised Drive: catching small, ordinary habits early, before they turn into the kind of mistake that shows up in next year’s statistics.

What This Actually Means for You

You don’t need to memorize a single number in this guide to get the point of it. What’s actually useful is the pattern:

The Bottom Line

The data doesn’t say driving is unusually dangerous. It says a small number of very ordinary, very human behaviours account for a disproportionate share of the worst outcomes. Speed, distraction, and impairment aren’t rare or unusual mistakes; they’re common ones that happen to matter a lot. Knowing that, and having someone in the passenger seat who’s actually watching for it, is a genuinely useful head start. If you’re curious what these behaviours actually cost on your driving record, our demerit points guide breaks that down province by province.