Carpool lane
It would be great if waze could calculate the time your route would take if you were in a carpool lane. As it can take less time when in an HOV lane, the arrival time given is usually off. For instance, when I use the I-405, it will want we to take the 1-110 and then the I-101, but then it will tell me that the route using the I-110 is slower than if I had just stayed on the I-405. This is quite annoying and so I would if you could put in either you were using the carpool lane or not.
Thank you for your suggestion! As you may know, Waze offers HOV routing for taxis. To change your vehicle type go to Settings > Vehicle type. There are currently no plans to add more HOV options.