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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).
Reminds me a bit of Australias (Sydney?) projecting giant Stop signs on water curtains in front of trucks that ignore all the other warning signs that they’re about to enter a tunnel with low ceilings.