I’m glad you linked the existing suggestion with it’s votes rather than creating a new one!
That said - I’ll be up front and say Waze has indicated they are reluctant to implement this feature. Due to a combination of needing to develop the infrastructure in some fashion to enable the marking of said hazards, and the comparatively lower priority to other features, I wouldn’t get too excited about it.
I think the need to use this option in some countries will be great since most of this speed bumps are not build accordingly to the country regulation and normally may damage the vehicle. Please add this option. Meanwhile I will post as Hazard.