"On your left"..................

Means absolutely nothing anymore. Whether running or cycling I find that most of the time people just dont hear you. My biggest problem.....cyclists who wear headphones. Are you nuts??? Riding is dangerous enough on the lake front but adding to the danger factor by wearing headphones is insane. I think they should start posting path rules every mile or 2 so people start getting the idea of hoe to utilize the path. Seriously, too many people just cutting across without looking (would you do that in your car crossing a road?), people walking the wrong way on the path, and my personal favorite.......people moving to there left when you say "on your left". Anyone else have any thoughts on this. It's getting worse and worse out there as the summer goes on.