Not all vehicles can travel at the posted speed limit. Some are limited by type or load. It would be cool if Waze could accommodate this and give an accurate ETA based on the planned speed of the vehicle, rather than the posted limit. For example, the maximum legal speed limit for any vehicle towing a trailer is 80 km/h on all roads in Ireland. Similar restrictions apply to HGV's. A reduced speed field at the start of a route plan would be great for all those drivers.