This is something I think intuatively, but I don't know if there's any reason to believe it.

A bus roote runs in a loop between A and B.

I'm waiting at a bus stop, somewhere on the loop, for a bus going from A to B.

Each bus stop on the loop has the same average bus frequency (I assume this would have to be the case anyway).

I see a B to A bus drive past on the opposite side of the road. Inutatively to me I think this means my wait is probably half over or more. For example if I started a stop watch when I got to the bus stop and it read X minutes when I saw the bus opposite, then I can expect my bus will be less than X minutes away.

Is there any validity to my intuition?