There is at least one piece of research however, that shows wearing a bicycle helmet (or being a male) causes people in cars to pass more closely presumably wit

There is at least one piece of research however, that shows wearing a bicycle helmet (or being a male) causes people in cars to pass more closely presumably with an assumption that you're less at risk. https://www.sciencedaily.com/releases/2006/09/060911102200.htm https://www.sciencedaily.com/releases/2006/09/060911102200.h...