When a driver is involved in a serious collision, particularly one resulting in death or injury, there is often an expectation that someone should be held criminally responsible. However, a serious collision does not necessarily mean that a crime has been committed.
A driver can make a mistake, exercise poor judgment or fail to pay sufficient attention without necessarily committing a criminal offence. The distinction between careless driving and criminally dangerous driving is an important one.
Canadian courts use the expression marked departure from the standard of care expected of a reasonable person when deciding whether a driver's conduct warrants criminal responsibility for dangerous operation of a motor vehicle.
The Reasonable and Prudent Driver
The law does not judge a driver's conduct by asking whether they intended to cause a collision or whether they personally believed their driving was safe. Instead, the court considers how a reasonable person would have driven in the same circumstances.
This hypothetical driver is often described as the reasonable and prudent driver. The standard recognizes that drivers are expected to exercise reasonable care and attention, obey the rules of the road and respond appropriately to hazards they encounter.
It does not demand perfect driving. Even a careful driver can make an error, overlook something or misjudge a situation. The law recognizes this because criminal punishment should not automatically follow every driving mistake.
What Is a Marked Departure?
A marked departure means considerably more than making a mistake. It describes conduct that falls well below what would reasonably be expected of an ordinary, careful driver in the same circumstances.
Everyone makes mistakes when driving. A driver might misjudge the speed of an approaching vehicle, overlook a hazard or momentarily lose concentration. Even when one of these mistakes causes a serious collision, it does not automatically mean that the driver has committed a criminal offence.
The courts must decide whether the driver's conduct was simply an error or whether it was so far below the expected standard that it deserves to be treated as a crime.
Dangerous operation of a conveyance is an offence under section 320.13 of the Criminal Code. The section includes dangerous operation causing bodily harm and dangerous operation causing death.
To convict someone of criminal dangerous driving, the Crown must prove both of the following elements beyond a reasonable doubt:
- The vehicle was being operated in a way that was dangerous to the public, considering all the circumstances.
- The driver's failure to meet the expected standard of care was a marked departure from what a reasonable person would have done in the same circumstances.
These are separate requirements. Proving that the driving was dangerous does not automatically prove that the driver is criminally responsible.
Looking at the Circumstances
The Supreme Court of Canada has explained that the question is not simply whether the driving was dangerous. The court must also consider whether the driver's failure to recognize and avoid the danger represented a marked departure from the standard expected of a reasonable person.
In R. v. Roy, 2012 SCC 26, the Supreme Court described two questions that help make this determination:
- Would a reasonable person, considering all the relevant evidence, have foreseen the risk and taken steps to avoid it if possible?
- If so, was the driver's failure to foresee and avoid the risk a marked departure from the standard of care expected of a reasonable person in the same circumstances?
These questions recognize that driving decisions are made in real-world conditions. Visibility, road conditions, the actions of other road users and the time available to react can all be relevant.
A Tragic Mistake Is Not Necessarily a Crime
The decision in R. v. Roy illustrates why this distinction is important.
Roy was driving home from work with a passenger on a late November afternoon. Visibility was limited by fog, and the unpaved road was steep, snow-covered and slippery. He stopped before entering a highway, then drove into the path of an approaching tractor-trailer. His passenger was killed in the resulting collision.
Roy was convicted of dangerous driving causing death. He appealed, eventually taking his case to the Supreme Court of Canada.
The Supreme Court agreed that his driving was objectively dangerous. However, it concluded that the evidence was consistent with a momentary error in judgment when assessing the speed and distance of the approaching truck. The evidence did not establish the marked departure required for criminal responsibility.
The Court set aside his conviction and entered an acquittal.
In other words, making a dangerous mistake with tragic consequences is not necessarily the same as committing a crime.
This decision followed the earlier case of R. v. Beatty, 2008 SCC 5, which also involved a fatal collision resulting from a momentary lapse of attention.
Beatty's pickup truck suddenly crossed the solid centre line and collided with an oncoming vehicle, killing all three occupants. There was no apparent reason for the truck to have crossed the centre line. The Supreme Court nevertheless restored the acquittals because the momentary lapse of attention, without more, did not establish a marked departure from the expected standard of care.
Both decisions demonstrate that a court cannot find a driver criminally responsible for dangerous driving simply because a dangerous mistake resulted in someone's death.
A Brief Period of Driving Can Still Be Criminal
It would be a mistake to conclude from Beatty and Roy that a short period of dangerous driving cannot amount to a marked departure.
The Supreme Court addressed that question in R. v. Chung, 2020 SCC 8.
Chung was driving in Vancouver where the speed limit was 50 km/h. Over approximately one block, he accelerated to 140 km/h while approaching a major intersection. As he accelerated, he moved into the curb lane, passed at least one vehicle on the right and dodged another vehicle. He collided with another vehicle making a left turn, killing its driver.
At trial, the judge found that Chung's driving was objectively dangerous but concluded that the brief duration of the excessive speeding did not establish the required criminal fault.
The Crown appealed. The British Columbia Court of Appeal overturned the acquittal, and the Supreme Court of Canada agreed.
The Supreme Court explained that the duration of the dangerous driving was not the deciding factor. The proper question was whether a reasonable person would have foreseen the danger created by the driving and whether the driver's failure to recognize and avoid that danger amounted to a marked departure from the expected standard of care.
Accelerating to nearly three times the speed limit while approaching a major intersection was a marked departure, even though the conduct occurred over a relatively short distance.
This illustrates an important point: A driver does not have to behave dangerously for an extended period to commit criminal dangerous driving. The seriousness of the conduct and the danger it creates matter more than how long it lasts.
A Momentary Lapse Can Still Be Criminal
The Supreme Court returned to the question of momentary inattention in R. v. Moshfeghi Zadeh, 2026 SCC 35.
The case involved an SUV driver who entered a downtown Vancouver intersection against a red light. It was struck by another vehicle travelling through the intersection on a green light. The impact sent the SUV onto the sidewalk, where it struck a father carrying his 18-month-old daughter. The father was seriously injured and the child died.
The trial judge found that the driver had experienced a momentary lapse of attention lasting approximately three to five seconds. She concluded that this was not a marked departure from the expected standard of care. The driver was acquitted.
The Supreme Court of Canada disagreed with the trial judge's approach. A majority ruled that a momentary lapse of attention can, on its own, amount to a marked departure. Its duration is one factor to consider, not the deciding factor.
The court must consider all the circumstances, including the type of vehicle, its speed, the location, road conditions and the visual information available to the driver. In this case, the red traffic lights and pedestrians crossing the road were important warnings that the driver should have recognized.
The Supreme Court set aside the acquittals and ordered a new trial. It did not find the driver guilty. The decision makes clear that a brief lapse of attention is not automatically excused simply because it was brief.
How Does This Differ from Driving Without Due Care and Attention?
The distinction is particularly relevant in British Columbia, where the Motor Vehicle Act also prohibits driving without due care and attention.
Section 144(1)(a) of the Motor Vehicle Act prohibits driving a motor vehicle on a highway without due care and attention. This is a provincial offence, not a Criminal Code offence.
The marked-departure requirement discussed in the Supreme Court decisions is the criminal fault standard for dangerous operation. It is not an additional requirement for a conviction under section 144.
Consequently, a driver may be found guilty of driving without due care and attention without having committed criminal dangerous driving. The two offences have different legal tests and different consequences.
There is also an important provision concerning vulnerable road users. Section 144(3) of the Motor Vehicle Act requires a court, when sentencing for an offence under section 144(1), to consider death or bodily injury to a vulnerable road user as an aggravating factor.
This recognizes the seriousness of the consequences when careless driving injures or kills someone who is particularly vulnerable on the road. It does not change the basic requirements for proving the provincial offence.
Why the Distinction Matters
The law attempts to balance two important considerations.
People who use the roads must be protected from drivers whose conduct creates unacceptable risks. At the same time, criminal convictions carry serious consequences and should not be imposed simply because a driver made a mistake that had tragic results.
The reasonable and prudent driver provides the standard against which conduct is measured. The courts must consider all of the circumstances, determine what risks a reasonable person would have recognized, and decide whether the driver's failure to respond appropriately was a marked departure from that standard.
A collision can be tragic without being criminal. Equally, a driver does not have to cause a collision or kill someone before their driving can amount to a criminal offence.
The distinction is not always easy to make, but it is fundamental to understanding how Canadian law deals with dangerous driving.
Learn More
- Log in to post comments