Dr. Ian Walker has found that wearing a helmet is more dangerous for cyclists, because “drivers tend to pass closer when overtaking cyclists wearing helmets than those who are bare-headed”:
To carry out the research, Dr Walker used a bike fitted with a computer and an ultrasonic distance sensor to find drivers were twice as likely to get close to the bicycle, at an average of 8.5cm, when he wore a helmet.The experiment, which recorded 2,500 overtaking motorists in Salisbury and Bristol, was funded by the Engineering and Physical Sciences Research Council.
Dr Walker, a traffic psychologist from the University’s Department of Psychology, said: “This study shows that when drivers overtake a cyclist, the margin for error they leave is affected by the cyclist’s appearance.
“By leaving the cyclist less room, drivers reduce the safety margin that cyclists need to deal with obstacles in the road, such as drain covers and potholes, as well as the margin for error in their own judgements.
“We know helmets are useful in low-speed falls, and so definitely good for children, but whether they offer any real protection to somebody struck by a car is very controversial.
“Either way, this study suggests wearing a helmet might make a collision more likely in the first place,” he added.
Dr Walker thinks the reason drivers give less room to cyclists wearing helmets is because they see them as “Lycra-clad street warriors” and believe they are more predictable than those without.