I stumbled across this article about 2 weeks too late. I wish I had known the inside lane rule!
The lanes of the track are somewhat like a highway. The inside lane is for the fastest runner, and each subsequent lane indicates a slower pace. For example, a five-minute miler would take the inside lane, a walker would take the outside lane, and a 10-minute miler would be in a middle lane.
On the track, passing is usually done on your left, just like the highway. You may need to step into another lane to let them go by, so it’s necessary to be aware of who is around you so you don’t cut someone off.
Now I know for next week. Apologies to everyone at the Harvard track last Wednesday and this past Tuesday.