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I say, with all due respect, that this is an issue for a small part of the worldwide community in only a few months of the year and that there are much bigger issues to worry about at the moment. I'd rather see Waze spent their time and effort on adding road types such as toll roads and ferrys, and regular updates of the maps instead of "niche" reports.
I'd suggest entering a hazard as soon as you see black ice. Even without a comment. Then you can always add a comment to it the next time you stop at a traffic light.
For the Wazers in the northern region, black ice is pretty common during the dark months. It kills (well, indirect at least) a lot of people every year.
A separate warning for this would probably save some lives each year and therefor be a prioritized matter. Since it hit big areas that trigger for the warning should be much further away than today's Rain or Snow, perhaps 5-10 km, maybe further.
I would really appreciate if this was added to the wish list.
Re: New report function needed