Nonprofit Transportation Alternatives studied New York bicyclists and found twice as many women biking in a protected bike lane in comparison to a nearby one that shared the road:
"As the roads offered more separation for bikes, T.A. counted dramatically more cyclists using them. The effect was particularly dramatic for women: Only 15 percent of the cyclists on Seventh were women, compared to 32 percent on Second."
Streetsblog digs deeper with data from the NYC Department of City Planning.
Thanks to Noah Kazis