If you are still here, runner, think about this. Forget markings and signals: respect is mutual. Having said that, *******s run and *******s bike. They also drive, sleep, eat, drink, and walk. I don't think that yelling is appropriate in a situation like this unless someone's about to put your life in danger. You should probably stop thinking as if you own the bridge. What happened here is that two people that think the bridge belongs to them met, and yelling occurred.