@Steven *******
I suggest to ride a bus once. Your comment is completely unappropriated. The buses are as safe as in Germany. No damn difference. Perhaps even more safe, but in Thailand you have a Gazzillion of busses running and in Germany only a few. The bus here is a Mercedes. And some poster above thinks "authorities have to be informed" if a bus is switched from Diesel/Gazoline to Nat Gas. The damn bus comes with nat gas out of the factory. Why being or pretending to be in Thailand, if you hate the country so much?
Except for ultra old buses, like the "red ones" in Bangkok, all transport runs on Nat Gas, every damn Taxi is a Nat Gas/electric hybrid.
From the pictures of the bus, you can see, it was in perfect condition.