One thing that's useful is priority signalling at traffic lights that gives buses a green light on busy routes. In my hometown of Munich, this has cut journey t

One thing that's useful is priority signalling at traffic lights that gives buses a green light on busy routes. In my hometown of Munich, this has cut journey times on some routes by 20%: [pdf] https://www.mvg.de/dam/mvg/ueber/unternehmensprofil/mvg-image-englisch-s.pdf https://www.mvg.de/dam/mvg/ueber/unternehmensprofil/mvg-imag... This in turn means cost reductions as fewer buses/ drivers are needed to run the lines.