Can we agree that cyclists deserve the grace of being able to initiate let-through just like applies to all those other vehicles?
But, we're talking about cyclists... there's room if in single file... As a cyclist, I feel safer after the car has passed and not pacing me slowly. There are several double yellow hills here, where it would take me 3-5 mins to climb, and a car 3 secs to pass. Maybe the slow vehicle rule should apply... the slower vehicle (bike) should pull over. For me, there's been room.
Let's say everyone
is being both patient and courteous.
I've been in way too many people-snakes, as a driver, cyclist, and skater, to regard 'single file' as automatically safer or easier. Pothole? Pavement crack? Large branch? Someone (hope not) falling? Oops, no room. How about a cyclist trying to pass another cyclist? Again, no room. And then you have a car splitting the group, i.e. moving at the speed of the slowest person in front of that car, slowing down the cyclists behind and bunching
them. The second car attempting to pass is going to find their day well slower than if that 10, 20, 30-rider bunch was bunched to allow one-go passing on a broken yellow.
Let-through at the person-in-front's discretion, not automatically, is the best solution I see.