What are the main advantages? Well, firstly, PAVs won't/ might have human drivers so there won't /might be fewer accidents. And PAVs fly. This will /won't be great for countries where the roads aren't good. PAVs will/ won't be able to travel faster, moving at about 150 km per hour, so journey times will /won't be shorter.
But there are also problems. One disadvantage is that people like cars and might /not will want to stop driving. And if we have problems on the roads now, then in the future we won't /might have traffic jams in the air as well.