Bus lanes that double the *speed* of buses also double the *frequency* of buses.
Can you imagine how politically difficult it would be to double the frequency of every bus in your town? It'd mean approximately doubling your bus system''s operating budget.
But bus lanes (and bus signals) can do it.
The secret is that the public is no longer paying drivers (and their buses full of passengers) to sit in trafffic.
In Bus Lane City, each driver finishes a full lap when their counterpart in Congestion City is just turning around.