Didn't say bus, I meant public transit overal. Living and working in two cities of that size there should be faster public transit between them.

Either that or better city planning so you don't end up with two cities of 140k and 300k but instead have one city of 440k with better interconnects between neighbourhoods and more light rail.

Travel by bus in London and your opinion may change

BRT can do interesting things though, since it can skip traffic without skipping stops.