A study from the Bath University in England has shown that wearing a bicycle helmet was more likely to cause the cyclist to be struck than than a cyclist who was riding without one. The cause being cars drove closer to helmeted cyclists.
Dr Ian Walker, from Bath University, fitted an ultrasonic distance censor as well as a computer to his bike and recorded some 2,500 overtaking vehicles on the roads of Salisbury and Bristol.
Dr Walker found that on average, motorists drove 8.5cm closer to a helmeted cyclists, and there was a difference of some 14cms when the motorist believe Dr Walker was a woman. He was struck twice during the experiment, both times wearing a helmet.