When creating a route on a highway with both "cars only" part and "trucks and buses" part Waze often leads me on the "trucks and buses" part of the highway for no reason (even though it's clearly stated in the settings that I drive a private car, not a truck or a bus). For example on I-95 highway in the north-eastern US.
Now when I'm aware of this problem I ignore Waze's directions and take the "cars only" part of the highway. It's faster in 99% of the cases.
However, for the next 30 miles (or even more) Waze suggests me to exit the highway, return all the way to the place where I entered the highway and enter the highway again to the "trucks and buses" lane. So I have to manually stop the route and start it over from the current position. It's a dangerous thing to do while driving.