Waze's Carpool service is all about adding more passengers to save money on your commute, so wouldn't it make sense to invite multiple riders in one go? You can now. Waze has updated its Carpool app with an option to easily add multiple passengers to a carpooling session -- it can take just a couple of taps to fill every spare seat. This might be vital if you were counting on taking the HOV lane to work, or if you just want more than one person to talk to during a long trip.