[pc86]

That sounds identical to what the Calgary busses do? You'd still need coordination between the busses to know when the loaded bus "wants" the empty one to overtake it.

[a_e_k]

The difference is that it was a one-and-done thing rather than leapfrogging back and forth as it sounds like `theluketaylor` was describing.

And yes, the drivers would coordinate. (I've sometimes seen it done with a brief honk for attention followed by a hand wave.)

[mulmen]

Why does the loaded bus’ preference matter? If you see a bus stopped ahead of you with the same route number and nobody requested that stop then just continue.

[hobo_in_library]

The driver in the front sticks his hand out the window and waves to the one in the back