If you are under investigation for causing death by dangerous driving, you are facing one of the most serious allegations that can arise from a road traffic collision. A conviction can lead to a substantial prison sentence, mandatory driving disqualification and lasting consequences for your personal and professional life.

However, an allegation does not establish guilt. You have the right to defend yourself, and the prosecution must prove every part of its case beyond a reasonable doubt. It must establish that not only was your driving dangerous and that it was obvious to a competent and careful driver that the driving would be dangerous, but also that your driving caused or contributed significantly to another person’s death.

At JMW, our specialist dangerous driving solicitors defend people from the earliest stages of a police investigation through to Crown Court proceedings. Here, we explain how a death by dangerous driving allegation can be defended, the evidence that may be challenged and the role a solicitor plays in building the strongest possible case.

What must the prosecution prove?

Causing death by dangerous driving is an offence under section 1 of the Road Traffic Act 1988. It applies where a person causes another person’s death by driving a mechanically propelled vehicle dangerously on a road or other public place.

To secure a conviction, the prosecution must prove:

• You were the person driving the vehicle.
• Your driving fell far below the standard expected of a competent and careful driver.
• It would have been obvious to a competent and careful driver that driving in this way was dangerous.
• Your driving caused or made a significant contribution to the death.

Each part of the allegation must be supported by sufficient evidence. The fact that a collision had a fatal outcome does not, by itself, prove that the driving was dangerous.

The distinction between dangerous and careless driving is especially important. Careless driving falls below the expected standard, while dangerous driving falls far below it, and creates a risk that would have been obvious to a careful driver.

Where the evidence suggests an error, lapse or misjudgement on the part of the driver, but does not meet the higher dangerous-driving threshold, causing death by careless driving may be the appropriate allegation instead.

Why is early legal representation important?

A defence should begin during the police investigation rather than after a charging decision has already been made.

Following a fatal collision, you may be arrested or invited to attend a voluntary police interview. A voluntary interview is conducted under caution, which means that the police may rely on your answers as evidence during later criminal proceedings.

Speaking to a specialist motoring solicitor before the interview allows you to prepare your defence from the outset. Our solicitors are accredited to provide representation at the police station and have extensive experience of interviews involving dangerous driving allegations. We can attend the interview, protect your legal position and ensure that you do not undermine your defence through speculation, uncertainty or an incomplete account.

Early involvement also gives us an opportunity to identify evidence that could support your case before CCTV footage is overwritten, dashcam recordings are deleted and witnesses’ memories fade. We can act promptly to secure relevant material and determine whether independent expert analysis is needed.

The police may initially investigate the most serious potential offence, but their first assessment does not bind the Crown Prosecution Service or the Crown Court, and the charge may change when the evidence is examined fully.

What evidence can be challenged?

Death by dangerous driving cases often depend on several different forms of evidence. The prosecution may rely on:

• CCTV or dashcam footage.
• Statements from drivers, passengers and other road users.
• Collision reconstruction reports.
• Vehicle examinations and electronic data.
• Mobile phone records.
• Calculations relating to speed, braking and road position.
• Toxicology results.
• Evidence about traffic lights, road signs and the road layout.
• Weather, visibility and surface conditions.
• Medical evidence.
• Answers given during a police interview.

These sources do not always tell the same story. Witnesses may have only had a brief or obstructed view of the collision. Estimates of speed may be unreliable. Footage may show only part of the incident, while a police reconstruction may depend on assumptions that can be tested.

Where the evidence conflicts, the prosecution may not be able to prove that your driving was dangerous, or that it caused death, beyond reasonable doubt. This in-depth analysis from the outset can be the difference between a conviction and an acquittal, or between a charge of dangerous and careless driving.

JMW's specialist solicitors will review the prosecution evidence as a whole, rather than considering each item in isolation. We will identify inconsistencies, request undisclosed material and instruct collision reconstruction experts to test police conclusions.

An expert can analyse the movements and speed of each vehicle, the time available to react, the effect of braking and whether the collision could have been avoided. This evidence can be central to challenging both the standard of driving and causation.

Can you argue that the driving was not dangerous?

One of the main ways to defend a death by dangerous driving allegation is to dispute whether the driving met the legal definition of ‘dangerous driving’.

The prosecution must show that the driving fell far below the standard expected of a competent and careful driver and that the danger would have been obvious.

A defence may arise where the evidence shows that:

• The incident involved an isolated lapse or misjudgement rather than sustained dangerous conduct.
• The prosecution has overstated the speed, duration or risk involved.
• Witness accounts are inconsistent with CCTV, dashcam footage or vehicle data.
• The driver was responding to a sudden and unexpected hazard.
• The alleged danger would not have been obvious in the circumstances.
• The standard of driving was careless rather than dangerous.

Examples such as excessive speed, aggressive driving, dangerous overtaking, ignoring traffic lights or prolonged mobile phone use may support a dangerous-driving allegation. However, the court must consider the factual circumstances of the incident rather than classifying the driving by reference to a single act.

A short incident can still be dangerous where the risk is extreme. Equally, an error with tragic consequences does not automatically mean the driving fell far below the required standard.

Our role is to examine where the driving sits in relation to the statutory threshold and challenge any attempt to treat the outcome of the collision as proof that the driving itself was dangerous.

Can you challenge whether the driving caused the death?

Even where the prosecution can establish some form of dangerous driving, it must also prove causation. This means showing that the driving caused or made a legally significant contribution to the death. It is not enough to establish that dangerous driving occurred at some stage before the collision.

Causation may be challenged where:

• Another road user’s actions caused or contributed significantly to the collision.
• A separate event occurred between the alleged dangerous driving and the fatal impact.
• The collision would have happened regardless of the defendant’s actions.
• The prosecution has misunderstood the order in which events occurred.
• An unknown mechanical defect, road condition or obstruction caused a loss of control.
• Responsibility has been attributed incorrectly where more than one vehicle or person was involved.

These issues often require detailed expert evidence. A collision reconstruction expert can assess whether the prosecution’s account is physically possible and whether the alleged driving made a material difference to the outcome.

The involvement of another party does not automatically provide a defence. More than one person’s conduct can contribute to a collision. The central question is whether the prosecution can prove that your alleged dangerous driving caused or contributed significantly to the death.

Can mechanical failure provide a defence?

A sudden and unforeseeable mechanical failure may provide a defence where it caused the driver to lose control of the vehicle.

This could include an unexpected failure involving the brakes, steering, tyres or another essential component. The defence will usually require evidence from a suitably qualified vehicle expert.

The court will consider whether the defect existed before the collision, and whether the driver knew about the problem or there had been earlier warning signs. If a competent driver would have identified the risk or if it would not have existed if the vehicle had been maintained appropriately, a mechanical problem is less likely to assist the defence, particularly if the driver knew that the vehicle was defective but chose to continue driving. Knowingly driving a dangerously defective or dangerously loaded vehicle may itself support the allegation that the driving was dangerous.

A solicitor can arrange for the vehicle and maintenance history to be examined independently rather than relying only on the prosecution’s findings. If the mechanical defect caused the collision, and the defect was known or should have been known to the driver, the expert solicitors at JMW will work to engage relevant experts to minimise the sentence. The best interests of our clients are our priority.

Can a sudden medical emergency provide a defence?

A sudden medical emergency may provide a defence if it caused the driver to lose control without warning and could not reasonably have been foreseen.

This may apply where a person experiences an unexpected loss of consciousness, seizure, cardiac event or another serious medical episode while driving.

The prosecution's evidence will need to prove that: 

• The driver had experienced earlier symptoms.
• The condition had previously been diagnosed.
• Advice had been given by doctors.
• Medication affected the ability to drive.
• The driver had been advised to stop driving.
• A lack of adequate sleep or another known factor created an obvious risk.

A medical event will not automatically provide a defence. If the driver knew that a condition, medication or severe fatigue made driving unsafe, the prosecution may argue that the decision to drive was itself dangerous.

We can obtain medical records and instruct an appropriate expert to assess whether the event was sudden, unforeseeable and responsible for the loss of control.

Can you dispute that you were driving?

In some cases, the identity of the driver may be disputed.

The prosecution must prove that you were the person driving the motor vehicle at the relevant time. It may rely on witness evidence, CCTV, forensic material, admissions or information about the vehicle’s ownership.

The prosecution's evidence about who was driving may be open to challenge where: 

• The position of the occupants after the collision does not clearly show who was driving.
• CCTV or dashcam footage does not show who was at the wheel.
• DNA or fingerprints inside the vehicle have an innocent explanation, such as shared use of the car.
• Mobile phone or location data is inconsistent with you being the driver.
• Several people had access to the vehicle, so ownership records do not show who was driving.
• Witness descriptions are vague, inconsistent or do not match you.
• Comments or admissions attributed to you were misheard or taken out of context.

If the evidence cannot establish beyond reasonable doubt that you were the driver, the prosecution cannot prove the offence against you.

Can the charge be changed to causing death by careless driving?

An initial allegation of causing death by dangerous driving can be reconsidered where the evidence supports a different conclusion. The police’s initial view does not bind the Crown Prosecution Service or the court.

A solicitor can argue that a charge of causing death by careless driving more accurately reflects the incident because the driving fell below, but not far below, the standard expected of a competent and careful driver.

This may involve challenging the prosecution’s interpretation of the speed or risk, presenting independent collision evidence, testing witness accounts and showing that the conduct amounted to a brief lapse or isolated misjudgement rather than sustained dangerous driving.

The difference is significant. Causing death by dangerous driving carries a maximum sentence of life imprisonment, while causing death by careless driving carries a lower maximum penalty.

The expert team at JMW often submits comprehensive written representations to this effect prior to trial, arguing that the threshold for dangerous driving has not been met, and the case is more reflective of a careless driving offence. 

Importantly, the jury can be given the option of finding guilt for the alternative offence of causing death by careless driving. Should the defendant maintain innocence regardless, the team at JMW will work to substantiate the defence. However, if after thorough analysis and expert evidence, you are advised that your case is one of careless rather than dangerous driving, the alternative verdict available to the jury can affect any prison sentence imposed by a matter of years. It is essential that you choose the right representatives who understand this distinction, and the importance of each decision at every stage of the process.

Our guide to the difference between death by careless and dangerous driving explains these legal thresholds and sentencing consequences in more detail.

What happens if you accept some responsibility?

You may accept that you made an error without accepting that your driving was dangerous.

You should never enter any kind of plea without a specialist solicitor first reviewing the prosecution evidence to identify any available defences and advising whether the charge reflects the incident accurately.

Depending on the evidence, we may advise you to:

• Plead not guilty and challenge the allegation at trial.
• Make representations that careless driving is the appropriate charge.
• Agree a written basis of plea setting out the facts you accept.
• Enter a guilty plea where the evidence supports the charge.
• Obtain further expert evidence before making a decision.

An early guilty plea may reduce the sentence, but it should not be entered before you understand the evidence and consequences. JMW’s guide to pleading guilty to dangerous driving explains why this can be a strategic decision only where there is no reasonable prospect of successfully defending the allegation.

A basis of plea may also be important where you accept the offence but dispute aspects of the prosecution’s account. It can define the factual circumstances on which the court will be asked to sentence you.

What if a full defence is not available?

Where the evidence supports a guilty plea or you are convicted following a trial, a solicitor can still make a significant difference through mitigation.

Mitigation is not a defence to the allegation. Its purpose is to ensure that the sentencing judge considers your level of culpability and your personal circumstances fully.

We can:

• Challenge the culpability category proposed by the prosecution.
• Dispute aggravating factors that are unsupported or overstated.
• Ensure that the same feature is not counted against you twice.
• Prepare an accurate basis of plea.
• Gather medical and psychological evidence.
• Obtain employment and character references.
• Present evidence of genuine remorse and cooperation.
• Explain efforts to seek emergency assistance after the collision.
• Address caring responsibilities and the impact of custody on other people.
• Secure the appropriate reduction for an early guilty plea.

Previous convictions, multiple deaths or serious injuries, driving a stolen vehicle, intoxicated driving, driving whilst disqualified and leaving the scene may increase the sentence. The effect of these matters will depend on the facts and whether they have already been taken into account when assessing culpability.

What penalties could follow a conviction?

Causing death by dangerous driving can only be tried in the Crown Court. For offences committed after 28 June 2022, the maximum sentence is life imprisonment. The current sentencing guideline has an offence range of two to 18 years’ custody.

A conviction also carries a:

• Mandatory driving disqualification (5 year minimum).
• Compulsory extended driving test before the licence can be restored.
• Possibility of an unlimited fine.

The Crown Court will consider the culpability category, aggravating and mitigating factors, any guilty plea and the factual circumstances before imposing sentence.

Given the seriousness of these penalties and the possibility of a life sentence as the maximum penalty, your solicitor should examine the prosecution evidence and the legal basis of the charge in full before any plea is entered.

How JMW can help

Our motoring offence solicitors provide specialist legal representation from the beginning of the police investigation through to the conclusion of Crown Court proceedings.

We:

• Advise and represent you at the police station.
• Prepare you for an interview under caution.
• Review and challenge prosecution evidence.
• Preserve CCTV, dashcam footage and other defence material.
• Instruct reputable collision reconstruction, vehicle, medical and toxicology experts.
• Consider whether the driving was dangerous.
• Consider whether the driving caused the death.
• Consider and, where appropriate, make representations about the appropriate charge.
• Advise you on guilty and not-guilty pleas.
• Prepare a basis of plea (where appropriate).
• Prepare detailed mitigation.
• Work with experienced counsel to represent you in the Crown Court.

Our team has extensive experience of dangerous driving cases, including allegations involving death or serious injury. JMW’s wider motoring law team represents motorists from the first police contact through to trial, sentence and any appropriate appeal.

We will assess the evidence carefully, explain your legal position and take the necessary steps to build the strongest defence available.