You missed this part:

> Also, because of the expensive infrastructure that can only be used by trams, there’s a permanence there that prevents future politicians from ripping it out to put more cars on for a quick political win with drivers.

A few things to further this:

- I’ve seen bus lanes get ripped out and moved around, you can see where the paint was cut off.

- Taxis use bus lanes, usually.

- People use bus lanes illegally if they’re not enforced with cameras (political cost of installing the cameras).