The tram line has been open for about two years now, but people still have trouble remembering the tram has the right of way. Maybe this will help, the audible warning doesn't seem to be enough since many people have headphones (understandable, noise cancelling is a must if the city has any car traffic).
I love it when accessibility features like this are embedded into the environment in a manner that's functionally invisible to most people. So much design expertise goes into our built environment that most of us aren't at all aware of.
The 99% invisible podcast comes to mind — they look at things like this (it's not specifically about accessibility, but rather design more generally)