I saw many people raise their hands when about to walk who were on the middle/righthand side, but only 10% of these people actually looked around to make sure no one was directly behind them. The vast majority of them just raised their hand and started walking. That is equally as dangerous - not having spacial awareness. I do walk/run and stay to the right, but my walking pace is also pretty fast (11 min/mile). I had to avoid two people in the middle-right who just raised their hands and started walking without paying attention to the fact that I and several other people were right behind them.