Naypyidaw is a strange city, and I think that highway was just overengineered in a country where few people actually own cars.
Actual "planned cities" tend to not be too bad.
I can think of three off the top of my head -
Canberra, the capital of Australia, is a planned city designed about government and its needs.
Brasilia, the capital of Brazil, is a planned city designed around government buildings and departments.
Washington DC, the capital of the United States, is a planned city designed around the Capitol Building and various monuments.
Come to think of it... planned cities seem to have a common theme - dedicated capital city focused entirely on containing the seat of government with ample amounts of room dedicated to hold the legislature, highest levels of the judiciary, various kinds of government departments and their civil servants, where applicable house the head of state and also serve as a cradle for various foreign embassies to be constructed close to each other, often close to some sort of foreign ministry.
The US, Canada, Brazil, Australia, Myanmar, Turkey, Kazakhstan, Côte d'Ivoire and India all have capital cities which were built as planned cities in order to think of everything that could possibly be needed in one place, with all the infrastructure that could be needed... or so people assumed.
You could argue that Washington DC, Ottowa, Ankara and New Delhi have all grown substantially and arguably organically since they were established, but... other planned cities either remain as this kind of strange government construction or they turn into the likes of Dubai - a city so full of Petrodollar investments, they failed to plan for a sewage system, and all the city's shit has to be pumped into trucks to be taken to a different city for processing.