Apparently the tourism industry is back and booming again in Chiang Mai, so much so that for the next 3 days busses are banned from going up Doi Suthep to help prevent too many tourists from visiting during the holiday.
No, it's not a joke.
TLDR : Answer Summary
In Chiang Mai, buses are temporarily banned from accessing Doi Suthep over concerns about the surge in tourism during the holiday, aimed at preventing safety issues due to increased traffic and potential danger from large tour buses. Alternative transportation options like motorbikes and red trucks remain available.