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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'm pretty sure the real reason it's projected is so it doesn't get covered by snow in the winter. At least that's the reason for projected street signs elsewhere in Finland, such as in Oulu.
Ah, now I understand why IKEA uses those projected light arrows.
saw a projected ad on the floor in a grocery store. i have weak balance, so you can imagine what happened when the ad suddenly swiped to the side as i was walking over it...
That's partly the reason, that's why they're used e.g. for marking bike paths. This has the added benefit of being very noticeable when you're looking at the ground.