Runner's protocol also has a few other items, at least where I run at. This is in a self-competitive environment, where the goal is to run around the track in the quickest time possible, not necessarily for distance.

Shouting "Track!" - I will be passing on the inside of the track from you, so move over to the left (or right) before I will have to tap your shoulder.
Staying on the outside of the track - I am a slow runner. encourage me while you pass by.