Hey Robert, read your post about being passed on the right and mostly I agree with your feelings. It’s best to pass on the left while riding in groups or passing other riders while on the roads and trails. Sorry if I’ve been a jerk to other riders in the past.
But I’d also say if I came up behind slower riders on route 100 next to the rumble strips with the wide shoulder I’d pass them on the right, but first I’d call out to them, “ On your right!” This section of road is a favorite for riders to test their time-trialing skills or do speed intervals.
Here’s why, it’s a wide shoulder there, five feet or so. But most people ride to the left side near the rumble strips because there’s less broken pavement, glass, and other road grit. So I’d be willing to ride in the extra mess for the short distance that I was passing you. This also keeps us both out of the main roadway and not needing to cross the rumble strips into traffic.
The key here is communication and calling out to the rider ahead that you’re passing on the left or the right. Being startled is no fun. Both the left and right are blind spots for the slower rider, so give a friendly call of, on your left or right as the case maybe. Of course I also simply say good morning to a fellow rider as I come up on them in a more casual situation.