

In my childhood I learned having the driver sit on the left was so that the person riding “shotgun” would be better able to fend off attacks without elbowing the driver. (Probably starting before shotguns, because it would be even more important with a sword.) Although they could use the whole road/trail back then, it would make sense to pass an oncoming wagon on the side where the drivers could see how much room they had between them.





If you would rather invest in a quality whistle for the one that goes in your own mouth, I recommend an ACME Thunderer.
As used by gym teachers and drum majors, (not Wile E. Coyote) they have a satisfying roll of authority.