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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).
IKEA also has this, at least in the one I used to visit.
Given that they're for navigating indoor hallways, though, they're probably not meant for inclement weather.