Why can’t you have one-way streets in a rural area? Fork off the main street on one end, merge on the other. Pedestrian and bicycle traffic can be bidirectional, cars can take a little detour they don’t use muscle energy.
Wide enough for one pickup and no opposing traffic, but so narrow that two pickups are going to really have to negotiate to move around each other."
How does that translate to "block the street for buses? If a street fits two pickups it fits two buses. They’ll have to negotiate to move around each other so if you have many (which, as I told you a lot, you shouldn’t) you should consider a one-way road, or maybe a meeting bay, or a wider street with choke points, or whatever. But it’s not “blocking the road for buses”.