Peter Frimberley wrote:

It's only anti-stupid-car and anti-selfish-car. There's very little
point in trying to overtake buses on that stretch, you just get stuck
seconds later in the next queue of traffic anyway. Might as well just
go in convoy with the buses and the whole thing would run smoother
then.

The Dutch commonly enforce this kind of thing by having central
reservations even on "single-carriageway" roads.

Neil