Granted, the study results are true, this article sounds plausible. However, being more likely to get struck by a vehicle while wearing a helmet doesn't mean that not wearing one is the way to go - since your chances of survival decrease drastically when being hit without a helmet. However, studies also showed that wearing long blond hair (or a wig - no joke!) decreases your chances of being struck by a vehicle.
What does this trigger for a conclusion, however? Driver's must be more careful about any cyclist, no matter whether a helmet, or blond long hair is involved or not. Anything else appears to be rather misleading information.
Check for yourself:
From New York Times:
Walker decided to find out — putting his own neck on the line. He rigged his bicycle with an ultrasonic sensor that could detect how close each car was that passed him. Then he hit the roads, alternately riding with a helmet and without for two months, until he had been passed by 2,500 cars. Examining the data, he found that when he wore his helmet, motorists passed by 8.5 centimeters (3.35 inches) closer than when his head was bare. He had increased his risk of an accident by donning safety gear.
Why? You might suspect that cyclists wearing helmets are more prone to take risks. But studies have found otherwise. The real answer, Walker theorizes, is that helmets change the behavior of drivers. Motorists regard a helmet as a signal that the cyclist is experienced and thus can be approached with less caution. “They see the helmet and think, Oh, there’s a serious, skilful person,” Walker says. “And you get hit.”
Walker will publish his findings next year in the journal Accident Analysis & Prevention. After a preprint of the article was circulated to colleagues, he was flooded with angry e-mail. Wasn’t he giving cyclists a green light to doff their headgear? Walker takes a more diplomatic approach. The mere fact that drivers are responding to a helmet means that they are making judgments, however unconscious, about cyclists. That means a government advertising campaign could retrain drivers to make the opposite judgment: a helmeted rider deserves just as much space.
Then again, Walker himself has a dim view of pro-helmet laws and rarely wears a helmet when he rides. But at least now he has an excuse. During his study, he was struck by a truck and a bus — both times, of course, while wearing a helmet.