If you've been putting off an ADHD assessment, this is worth reading first.
A 2026 systematic review and meta-analysis published in the journal Advances in Therapy pooled data across multiple studies to answer a specific question: how much more likely is someone with untreated ADHD to be in a motor vehicle accident, compared to the general population of drivers?
The answer: 93% more likely. Not a small effect, and not from a single small study — this is a pooled result across four separate studies, and it was statistically significant.
How this compares to other driving risks
To put that number next to something familiar, the same research team ran the identical kind of analysis on other well-known driving risks, using the same method so the numbers are genuinely comparable:
- ✓Driving while sleepy or fatigued: 162% increased risk
- ✓Untreated ADHD: 93% increased risk
- ✓Cannabis use while driving: 85% increased risk
- ✓Opioid or benzodiazepine use: 53% increased risk
Untreated ADHD sits right in the middle of that list. It's not a minor factor — it's comparable to some of the driving risks the UK already takes seriously enough to legislate against.
Why ADHD affects driving specifically
The core symptoms of ADHD are exactly the ones that matter behind the wheel: inattention, impulsivity, and difficulty sustaining focus over a long, repetitive task. A moment of distraction that most drivers catch and correct can, for someone with untreated ADHD, turn into a missed brake light or a late reaction.
The researchers were careful about what this does and doesn't mean. It doesn't mean everyone with ADHD is a dangerous driver. It means that when ADHD goes undiagnosed and untreated, the risk is measurably higher — and treatment is one of the few factors on this list that a person can actually change.
What this means for you
You can't undo a moment of fatigue after the fact. You can get assessed. This is exactly the gap ADHD Navigator exists to close. If you've suspected for a while that something's off and you've been waiting for a “good enough” reason to look into it, a nearly doubled accident risk is a concrete one.
It doesn't need to end in a three-year NHS wait — there's a free 3-minute screener, a full directory of verified private clinics, and NHS Right to Choose if you'd rather not pay. See our Right to Choose guide or take the screener to get started.
Source: Childress A, Malik H, Potenziano J. The Impact of Untreated Attention-Deficit/Hyperactivity Disorder on Motor Vehicle Accidents: A Systematic Review and Meta-Analysis. Adv Ther. 2026;43:3857–3869. Open access.
This article is for informational purposes only and does not constitute medical advice. ADHD Navigator is not a medical provider and does not offer diagnostic or treatment services.