Users should have the possibility to report a common danger in the road: Smoke. It can be from wildfires as described in another suggestion, however roads are not necessarily closed.
We have dangers like "ice on road" or "snow", however those are never used in countries where winter never gets below 0°C (or is highly unlikely). On the contrary, every year there are fires causing road hazards with visibility dropping considerably.
Related:
https://waze.uservoice.com/forums/59225-map-editor-suggestions/suggestions/41401828--wildfire-alerts