protocol

walking three abreast on a sidewalk, already narrowed by snow banks, is a complete violation of basic sidewalk manners and protocol.

Don't do it.

Also: when walking with another person, the correct way to deal with an oncoming pedestrian is to move into single file to allow for ample passing room. Under no circumstances should one remain beside one's walking partner rudely forcing the oncoming party into the aforementioned snowbanks.

It's uncool. Really.

I will walk all over you.