Japan seems to be building a supercity too.
“Possible features of a supercity will include, for example, autonomous vehicles moving throughout the area, cashless payments and financial settlements, and digital administration that will automatically change information on one’s bank account and driver’s license, if necessary, after a move to another municipality. Comprehensive regulatory reform will be needed to make such a supercity possible.”

Sounds like a completely livable city, right?
https://www.japantimes.co.jp/opinion/2018/11/28/commentary/japan-commentary/pursuing-creation-supercity/#.XATPW_ZuISU