just goes to show that just cause people are riding bikes or even fully decked out (posers) on a bike doesn't mean that they understand the etiquette of riding.

Watch the riding form and you can tell a lot about a rider. We have beach cruisers, dudes on a bike looking for a babe and do really stupid things to get girls' attention and girls with very few sq inches of fabric riding on bike looking for a dude ... to you name it. So best to figure them out before you get too close. And the best way is by looking at their riding style. inexperienced riders don't have a very good form and tend to weave so I give myself extra room when I get close.

And fact of life, some guys just absolutely hate it when a girl passes by them and will just about do anything to pass you and including being hazard to you.

sorry to hear about running an obstacle course.