More about the riding w/ traffic and walking/running against traffic (some of this mentioned here)...
I was TAUGHT in kindergarden (I am pretty sure all my early days) that you walk facing traffic and ride w/ traffic. Do they not teach that any more? I was just a regular kid and I'm in my upper 40's now?
I run in a neighborhood and everyday I end up running face to face w/ another runner. And the bike against traffic IN A BIKE LANE...OMG, don't get me started. I really thought everyone knew the rules of the road, it was like learning to cross the street and look both ways. I am not sure they teach that anymore, either.
Ok, sorry for my rant.
Yes, I do for bicylists if I encounter them in a bike lane going the wrong way I let them know they are, because it endangers me. Most often no matter how nice I say it they don't seem to take it very politely. As for walkers and runners...I just don't have the energy to remind them to face traffic (or how about a little flashy light when it dark or just dusk/or before dawn, the hardest time to see anyone if you are driving a car!)

K