Best case of car transport would be if few ppl use it which is achieved by giving priority to public transport and bike paths. If this (car) mode is prioritized

Best case of car transport would be if few ppl use it which is achieved by giving priority to public transport and bike paths. If this (car) mode is prioritized, car transport by definition will be a worse experience than an ideal bus because you don't get traffic with the bus. Burying cars under is a good idea in theory but not that great in practice. It's extremely expensive to do it(and also build all the underground destination infra) and in the end you still will end up with traffic, the difference being that all the drivers will be trapped with their fumes/microplastic tire wear underground. You don't need to make cars much worse, just make pub transport and bike/pedestrian infra as good as possible and give what's left to cars