Why are female cyclists targeted by aggressive drivers for abuse?

By being on the road, women seem to be transgressing a boundary that some men find intolerable

I commute in London by bike. Run-ins with aggressive drivers are as much a part of my daily routine as brushing my teeth. Recently though, I've started to wonder whether there is a distinctly gendered dimension to the frequency and intensity with which I am shouted, sworn and honked at.

When I talk to friends who cycle, I'm struck by the instant recognition of this phenomenon by fellow women, who are quick to share their stories. Sometimes the abuse is explicitly sexual, more often it's simply aggressive and unpleasant, or merely patronising. Almost without exception, it's perpetrated by men.