I have just seen a bus on Mun Mueang Rd with the signage of belonging to RTC Chiang Mai City Bus. Is this a new service similar to the now defunct 20/30 baht bus scheme!
The only recent (Dec last year) info I can find is this;
As of today, the RTC Chiang Mai City Bus has resumed operations in Chi — Booker (bookerthailand.com)