Colin McKenzie wrote:

That extra second is significant. It prevents cyclists safely passing
bendibuses at the front of the queue at traffic lights, because it's
just long enough for the light to get from red to green and the bus to
move off. With an ordinary bus, even in the worst case you can reach
the front before it moves.

Why do you have to get past everything? If the lights are about to
change, and the bus is about to move, you might as well wait for it.
It'll only overtake you half an inch further up the road anyway.

Neil