Effects of ADHD on driver attention and speed, evaluated in a driving simulator


Drivers with Attention Deficit Hyperactivity Disorder (ADHD) have been considered to have a 3–4 times higher crash risk than control drivers without ADHD. A core issue which has not been properly dealt with is the role of comorbid diagnoses which frequently appear together with ADHD, especially Oppositional Defiant Disorder (ODD) and Conduct Disorder (CD), sometimes generically referred to as “conduct problems”. The increased crash risk associated with ADHD diagnosis presented in the literature is often based on studies performed with participants with more than one diagnosis. This means that the comorbidity may be high and, consequently, the effect of ADHD on traffic safety may be overestimated. This has been shown in a meta-analysis presenting a relative risk of 1.30 instead.

The existing research on drivers with ADHD is unsatisfying when it comes to methodology, specifically concerning inclusion and exclusion criteria for participants. This has led to a misunderstanding of the driving ability for people with ADHD, which has been cited and spread in the literature for two decades. People with ADHD diagnosis might suffer from this misinterpretation and the specific effects of ADHD on driving behavior remain unclear. There is a potential for better control for confounding factors, for exposure (mileage) and for comorbidity, especially CD and ODD.

The aim of this study was to examine differences in driving behavior between experienced drivers with and without ADHD, respectively.



Social sustainability and just mobility

Welcome to a research workshop on Social sustainability and just mobility, 8–9 October 2019 in Linköping, Sweden

European Road Profile User's Group, ERPUG

Welcome to the sixth ERPUG meeting in Vilnius, Lithuania. 

Vision Zero for Sustainable Road Safety in the Baltic Sea Region

The second Vision Zero for Sustainable Road Safety in the Baltic Sea Region conference will be held in Tallinn, Estonia. VTI is part of the programme committee. 



VTI is a new partner in f3

Since the end of January, VTI is a partner in f3, the Swedish Knowledge Centre for Renewable Transportation Fuels. f3 is a national knowledge centre for collaboration between industry actors, universities, institutes, and government agencies committed to...


Tests are underway in VTI’s new bicycle simulator

A project is currently underway in which VTI’s recently developed bicycle simulator is being used to study the interaction between cyclists, and drivers. The aim is to investigate how different infrastructure designs and types of vehicles influence cyclist...


The goal is to increase diversity and gender equality within transportation in Europe

VTI is participating in the research project TInnGO – Transport Innovation Gender Observatory. It is the first major EU project of its kind relating to the transport sector, gender equality and diversity. The VTI project manager Lena Levin appreciates the...


A driving licence withdrawal can have major consequences in everyday life

A withdrawn driving licence can have negative consequences for a person’s ability to shape their own life. A study from VTI investigates how individuals with visual field loss have been affected by no longer being permitted to drive.


Measuring sleepiness – a challenge for researchers

Driver fatigue has been a research area at VTI for several years, and the researchers have studied various aspects such as the working hours of professional drivers, driver behaviour, accident risks, and the design of warning systems. They are now moving...


Knowledge in the fight against microplastics from road traffic

The Government has commissioned VTI to develop and disseminate knowledge regarding the emission of microplastics from road traffic.