Sure. But I'd argue that the change-over should still involve a recovery break of some sort, because even just sitting in the passenger seat for lengthy periods of time can introduce fatigue. While it sounds counter-intuitive, being sat still for prolonged periods of time doesn't mean you are fresh and ready to go. You'll still need to get yourself moving, get blood flow moving, make sure you're alert and mentally switched on, give your butt a chance to not feel like you've been sat on it for 2+ hours etc etc.Of course, a lot of petrol car families (and presumably electric car drivers) have two people who can drive. They may want to take the breaks asleep in the passenger seat.