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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).
I like this idea for a lot of reasons. The inclement weather one I see in the comments is definitely one of them.
But it also puts me in mind of some of the clever ways I've seen posts and reflectors used to give the impression (when say you're driving at night and only see them out of the corner of your eye) of a person standing there, until you look at them properly and then they look exactly like what they are.
There's one in particular in a neighborhood where I used to live that to this day if I drive by it, my hindbrain says "HUMAN" and I really don't understand why because the post looks nothing like a human when I look at it properly. It's magic.