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Is there a visual warning already? Like this for example (from Germany)?

Sure, there are obviously visual warnings in real life, like that. Pretty sure that kind of thing is universal.

I'm talking about something that would pop on the Waze display, like 20 seconds ahead of reaching the crossing.

Why would this be an improvement?

It encourages taking drivers' eyes off the road. Can you offer an argument that its value is such that that's a net improvement?