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Case law

Dangerous Driving

8 reported decisions on this issue.

R v Bartlett

[1998] O.J. No. 1608

Ontario Court of Appeal 17 April 1998 dangerous driving causing death and bodily harm

R. v. Bartlett

[1998] O.J. No. 1608
Ontario Court of Appeal — Brooke, Abella and Laskin JJ.A. | April 17, 1998


Background

On December 31, 1993, seven young friends drove from Mississauga to Ottawa to celebrate New Year's Eve in two cars. Tyler Bartlett was a passenger in a Chevrolet driven by Bryan Monk, while their friend Christopher Kahl drove a Honda with two passengers. Shortly after the trip began on Highway 401, Kahl lost control of his Honda, crossed the median strip, and collided with an oncoming Plymouth Sundance. Kahl was killed, his passengers and the other driver were seriously injured.

The Crown's theory was that Monk and Bartlett had formed a common plan to spray beer on Kahl's car as a prank. According to the prosecution, Monk steered close to Kahl's car so Bartlett could spray the beer, Kahl swerved onto the gravel shoulder to avoid a collision, lost control, and caused the fatal accident. The defence argued the accident was caused by Monk's improper lane change without signalling, not any beer-spraying prank. Both accused were convicted of dangerous driving causing death and bodily harm.

Issues

  1. Did the trial judge properly instruct the jury on Bartlett's liability as a party under s. 21(2) of the Criminal Code?
  2. Did the trial judge correctly explain the legal test for dangerous driving?
  3. Were there errors in the jury charge on reasonable doubt and causation?

The Jury Instruction Disaster

The Ontario Court of Appeal found multiple serious errors in how the trial judge instructed the jury. First, on party liability, the judge told the jury Bartlett could be convicted if he "ought to have known there was a risk involved in squirting beer from a moving vehicle." This was wrong — Bartlett had to foresee that Monk would probably drive dangerously or with criminal negligence, not just that beer-spraying carried some general risk.

Second, the trial judge repeatedly told the jury they could convict for dangerous driving if the accused failed to exercise "the care of a prudent driver" — at least eight times. This wrongly equated dangerous driving with civil negligence. The correct test requires proof of a "marked departure" from the standard of a reasonable driver, a much higher threshold than simple negligence.

Third, the judge improperly told the jury they had to "choose between" the Crown's version and the defence version of events. Under R. v. W.(D.), juries don't have to pick sides — they must acquit if they have reasonable doubt after considering all the evidence.

The Causation and Consciousness Problems

The trial judge also erred on causation by instructing the jury they could convict if Monk's swerve "for whatever reason" caused the accident. This could have allowed conviction for a simple lane change rather than the beer-spraying prank the Crown was actually alleging. Finally, the judge charged on "consciousness of guilt" based on the accused throwing beer from their car before returning to the accident scene — but this conduct was equally consistent with panic over liquor licence violations as with guilt for dangerous driving.

Key Takeaway

Multiple jury instruction errors, even if individually minor, can combine to create an unfair trial requiring a new trial.

While any single error might have been overlooked, the cumulative effect of multiple mistakes in explaining the law deprived these accused of a fair trial, showing how crucial proper jury instructions are in criminal proceedings.

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R v Beatty

2008 SCC 5

Supreme Court of Canada 22 February 2008 dangerous operation of a motor vehicle causing death

R. v. Beatty

[2008] 5 LRC 10, 2008 SCC 5
Supreme Court of Canada — McLachlin CJ, Bastarache, Binnie, LeBel, Deschamps, Fish, Abella, Charron and Rothstein JJ | February 22, 2008


Background

On July 23, 2003, Justin Ronald Beatty was driving his pickup truck on Highway 1 near Chase, British Columbia. The weather was clear, the road was dry, and Beatty had been driving normally at the posted 90 km/h speed limit. Then, for no apparent reason, his truck suddenly crossed the solid centre line into oncoming traffic, killing all three occupants of the other vehicle. The collision happened in just 0.00268 seconds after crossing the line.

Witnesses following behind confirmed Beatty had been driving properly right up until the accident. There was no mechanical failure, no intoxication, no evasive maneuvers. When police arrived, Beatty appeared stunned and said he didn't know what happened — that he had "lost consciousness" briefly, possibly from heat stroke after working in the sun all day. He was charged with three counts of dangerous operation of a motor vehicle causing death under s. 249(4) of the Criminal Code.

Issues

  1. Can a momentary lapse of attention constitute dangerous driving causing death?
  2. What is the proper test for establishing the mens rea (mental element) of dangerous driving?

The Marked Departure Standard

The Supreme Court clarified that dangerous driving requires two elements: (1) objectively dangerous conduct (actus reus), and (2) a "marked departure" from the standard of care expected of a reasonable driver (mens rea). A mere departure that would attract civil liability isn't enough — there must be a marked departure that demonstrates sufficient moral blameworthiness to justify criminal punishment.

The Court emphasized that not every act of negligent driving constitutes criminal dangerous driving. The automatic and reflexive nature of driving means even good drivers will occasionally have momentary lapses. If every departure from perfect driving became criminal, "we risk casting the net too widely and branding as criminals persons who are in reality not morally blameworthy." The distinction between civil and criminal negligence is a matter of degree, but it's crucial.

Importantly, if an accused offers an explanation (like sudden illness), the court must consider whether a reasonable person in similar circumstances would have been aware of the risk. The Crown bears the burden of proving both elements beyond a reasonable doubt — it cannot simply point to the tragic consequences and work backwards.

Key Takeaway

A few seconds of negligent driving, without more, cannot support a conviction for dangerous driving causing death.

This case protects drivers from being criminalized for momentary inattention that would normally only result in civil liability or provincial traffic violations. The criminal law requires proof of conduct so far below the standard of reasonable care that it merits the stigma and punishment of a criminal conviction.

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R v Chung

2020 SCC 8

Supreme Court of Canada 27 March 2020 dangerous driving causing death

R. v. Chung

2020 SCC 8
Supreme Court of Canada — Martin J. (Brown, Rowe and Kasirer JJ. concurring), Karakatsanis J. dissenting | March 27, 2020


Background

On November 14, 2015, Ken Chung was driving north on Oak Street in Vancouver when he accelerated from 50 km/h to 140 km/h over the span of one block while approaching a major intersection at Oak Street and West 41st Avenue. The speed limit was 50 km/h. As he approached the intersection at this excessive speed, a Toyota was making a right turn in front of him, and another driver was making a left turn from the opposite direction. Chung narrowly missed the Toyota but crashed into the left-turning vehicle at 119 km/h, killing the other driver instantly.

Chung was charged with dangerous driving causing death under section 249(4) of the Criminal Code. The trial judge found that Chung's driving was objectively dangerous and satisfied the actus reus, but acquitted him because he had reasonable doubt about whether Chung possessed the required mens rea (guilty mind). The British Columbia Court of Appeal overturned the acquittal and entered a conviction, finding the trial judge had made an error of law.

Issues

  1. Did the trial judge commit an error of law that would allow the Crown to appeal the acquittal under section 676(1)(a) of the Criminal Code?
  2. What constitutes the proper legal test for mens rea in dangerous driving cases involving momentary excessive speeding?

The Momentary Speeding Error

The Supreme Court majority found that the trial judge made two critical legal errors. First, he applied a wrong legal principle by becoming fixated on the "momentariness" of Chung's speeding, treating brief periods of excessive speed as categorically insufficient to establish criminal fault. The Court clarified that momentary excessive speeding can absolutely establish mens rea for dangerous driving where it represents a marked departure from reasonable care — the duration alone doesn't determine the outcome.

Second, and more importantly, the trial judge failed to apply the correct legal test from R. v. Roy. Instead of asking whether a reasonable person in Chung's circumstances would have foreseen the risk and taken steps to avoid it, the judge focused only on distinguishing this case from others involving longer periods of speeding. He never analyzed what a reasonable person would have foreseen when accelerating to nearly three times the speed limit while approaching a busy urban intersection with other vehicles present.

The Reasonable Person Standard

The Court emphasized that dangerous driving mens rea requires comparing the accused's conduct to what a reasonable person would have done in the same circumstances. A reasonable person would have immediately foreseen the serious risk of accelerating to 140 km/h in a 50 km/h zone while approaching a major intersection. The fact that consequences occurred quickly after the dangerous behavior doesn't preclude finding criminal fault — if anything, it demonstrates how foreseeable the risk was.

Key Takeaway

Brief moments of extremely dangerous driving can still constitute criminal behavior if they represent a marked departure from what any reasonable person would do.

This case clarifies that courts cannot apply rigid rules about duration when assessing dangerous driving — they must consider all circumstances and ask whether a reasonable person would have foreseen the risk and acted differently.

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R v Conley

[2019] ONCJ 66

Ontario Court of Justice 5 February 2019 dangerous driving causing death

R. v. Conley

2019 ONCJ 66
Ontario Court of Justice — Justice David A. Berg | February 5, 2019


Background

On September 1, 2016, Steven Bruce Conley was driving a large truck eastbound on Laurier Avenue in downtown Ottawa. At the intersection with Lyon Street, he stopped for a red light with cyclist Nusrat Jahan waiting in the bicycle lane beside him. When the light turned to a green arrow (indicating straight-through traffic only), Conley moved into the intersection without signaling and began making a right turn. His truck struck Jahan, pinning her underneath. Witnesses heard her screaming "Stop! Stop!" but the truck moved forward another foot, killing her instantly.

Conley was charged with criminal negligence causing death and dangerous driving causing death — serious Criminal Code offences carrying potential sentences of life imprisonment and 14 years respectively. The case hinged on whether his driving constituted a "marked departure" from reasonable standards, not just simple carelessness.

Issues

  1. Did Conley's failure to signal and premature entry into the intersection on a green arrow constitute dangerous driving?
  2. Did his forward movement after Jahan was trapped under the truck represent criminal negligence?

The "Marked Departure" Standard

Justice Berg applied the Supreme Court's decision in R. v. Roy, which established that criminal driving offences require more than simple negligence. The court must find a "marked departure" from reasonable driving standards — not just carelessness that might justify a civil lawsuit or Highway Traffic Act ticket. As the Supreme Court warned: "If every departure from the civil norm is to be criminalized, regardless of the degree, we risk casting the net too widely and branding as criminals persons who are in reality not morally blameworthy."

The judge found that while Conley's driving violated the Highway Traffic Act (failing to signal, moving on a green arrow when intending to turn), his overall conduct wasn't egregious enough for criminal conviction. Conley had driven properly on Laurier Avenue, stopped appropriately at the red light, and stopped immediately when he realized something was wrong. The judge accepted that a blind spot likely prevented Conley from seeing Jahan once stopped, and that he was genuinely unaware she was under his truck when it moved forward.

Key Takeaway

Criminal driving charges require proof of seriously substandard driving, not just violations that cause tragic consequences.

This case illustrates the high threshold for criminal liability in driving cases — even when someone dies due to clear Highway Traffic Act violations, the crown must prove the driving was a "marked departure" from reasonable standards, not merely careless.

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R v Lamoureux

Unreported

Ontario Court of Appeal 22 September 1994 falling asleep at the wheel

R. v. Lamoureux

Court File No. C14231
Court of Appeal for Ontario — Brooke, Arbour and Abella JJ.A. | September 22, 1994


Background

Daniel Lamoureux was charged with dangerous driving after falling asleep at the wheel. At trial, the Crown presented evidence about the incident, but the trial judge acquitted Lamoureux. The judge found that there was no evidence to indicate that Lamoureux knew or should have known he was vulnerable to falling asleep while driving, and that he was not alert to such a risk.

Her Majesty the Queen (the Crown) appealed the acquittal, arguing that the trial judge made errors in his analysis of the evidence. The Crown was represented by Roger A. Pinnock, while Lisa Silver represented Lamoureux.

Issues

  1. Did the trial judge err in his findings of fact?
  2. Was there sufficient evidence to support a conviction for dangerous driving?

The Appeal Court's Analysis

The Court of Appeal unanimously rejected the Crown's appeal. The three-judge panel found that there was "ample evidence to support the findings of fact made by the trial judge." Importantly, they noted that the trial judge's findings were "not attacked" — meaning the Crown failed to demonstrate any legal error in how the judge analyzed the evidence.

The court emphasized that the trial judge had properly considered all the evidence and reached a reasonable conclusion. The judge believed the evidence presented by Lamoureux and concluded that there were no indicators that should have alerted him to the risk of falling asleep while driving. This finding was crucial because dangerous driving requires proof that the accused's driving was a marked departure from the standard of a reasonable driver — and if Lamoureux had no reason to know he might fall asleep, his conduct wouldn't meet that threshold.

Key Takeaway

Trial judges have significant discretion in weighing evidence, and appeal courts will not second-guess reasonable findings of fact.

For defendants, this case demonstrates that if a trial judge makes supportable findings in your favor based on the evidence, the Crown faces an uphill battle on appeal. Appeal courts don't retry cases — they only overturn decisions when there are clear legal errors.

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R v Roy

2012 SCC 26

Supreme Court of Canada 1 June 2012 dangerous driving causing death

R. v. Roy

2012 SCC 26
Supreme Court of Canada — Cromwell J. | June 1, 2012


Background

On a foggy November afternoon in 2004, Randy Roy was driving his motor home back from work with his passenger Mark Harrington near Kamloops, BC. They took a shortcut on the unpaved Harmon Road, which becomes steep and slippery as it approaches Highway 5. Roy stopped at the intersection, then pulled onto the busy highway into the path of an oncoming tractor-trailer driven by Michael McGinnis. The collision killed Harrington instantly. Roy survived but lost all memory of the accident.

Roy was convicted of dangerous driving causing death under section 249(4) of the Criminal Code and sentenced to up to 14 years in prison. The trial judge found that Roy's driving was objectively dangerous, then immediately concluded it was also a "marked departure" from reasonable care — the mental element required for criminal conviction. The Court of Appeal upheld the conviction, saying any error was harmless.

Issues

  1. Did the trial judge apply the wrong legal test when determining fault?
  2. If so, was the error serious enough to overturn the conviction?
  3. Should Roy get a new trial or an acquittal?

The Critical Distinction: Dangerous vs. Criminal

The Supreme Court unanimously allowed Roy's appeal and entered an acquittal. Justice Cromwell explained that dangerous driving has two separate elements: the prohibited conduct (driving dangerously) and the required fault (a "marked departure" from reasonable care). The trial judge made a fundamental error by inferring fault simply from the fact that the driving was dangerous.

This distinction matters enormously. As the Court emphasized, "if every departure from the civil norm is to be criminalized, we risk casting the net too widely and branding as criminals persons who are in reality not morally blameworthy." Simple carelessness — even with tragic consequences — isn't enough for criminal conviction. The fault must be a marked departure from what a reasonable person would do.

The Court found that Roy's case showed only "a single and momentary error in judgment with tragic consequences" — likely a misjudgment of speed and distance in difficult conditions. Without evidence that Roy was aware of the risk he was creating and deliberately chose to run it, there was insufficient proof of the marked departure required for criminal fault.

Key Takeaway

Objectively dangerous driving alone cannot prove criminal fault — there must be evidence of a marked departure from reasonable care.

This case sets the bar high for dangerous driving prosecutions, requiring more than just proof that an accident happened or that driving was objectively risky. The Crown must prove fault beyond simple negligence.

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R v Sagevicius

[1999] O.J. No. 353

No summary has been written for this decision yet.

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R v Tetrault

[2001] O.J. No. 5043

No summary has been written for this decision yet.

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General information, not legal advice. No case here has been re-checked for later history — read the decision itself before you rely on it.

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