Didn't know that.... because nobody said it. I'll agree that the driver is at fault, though I will not agree that I am a retard.
I see a law that says "stay right". Riding single file is not only SMART, but a courtesy. I ride, I ride the open roads, and I've ridden in competition. Only a dick thinks it's anyone elses job to stay out of their way, only a corpse expects other people to protect their safety.
Quid Pro Quo: If you want people to be courteous to you, you should be courteous to them. Stay right, single file. Don't obstruct people who have shit to do, don't expect senior citizens in beige Cadillacs to be aware of their surroundings. "I was legally right" is a stupid epitaph.
And don't make cycling out to be something it's not. It's only as hard as you make it, the kinds of sports you're referring to don't involve machines (or balls, or tracks), and they are not safe.