I posted a picture once of a tour bus in Chiang Mai headed for Chiang Rai that was stopped at a stoplight - same, same - the tires were "Slicks." Then it's a constant wonder why these behemoth double-deckers end up in a mountain-side ditch with dead and injured strew all over the place wayyyyy too often.
Now, if there was just a regulatory agency in Thailand that inspects public transportation annually for obvious safety issues - hummmm ???? I've been on buses where the cops would stop buses as they exited the station and have the drivers blow into a breathalizer. Boy-howdy, the instills confidence, don't it?