> Buses can also have dedicated lanes with right-of-way. IME they're an improvement but no where near as good as separated rail. It's like building a 32 lane h

> Buses can also have dedicated lanes with right-of-way. IME they're an improvement but no where near as good as separated rail. It's like building a 32 lane highway, it speeds up most of your trip but then 90% of it is spent at the exit ramp. Underground would probably be an improvement for travel times but I'm not sure how much, part of the benefit of trams is their frequent stops so being completely unimpeded is less critical. I doubt you'd see the same level of retail build up along the lines too. One option I'd like to see return through the CBD would be elevated lines, I'm not sure why they fell out of fashion.