There are any number of things - addition to the mai pen rai attitude - that the US and other countries could learn from Thailand.
One thing I believe we'd be wise to borrow from them is their system of lit traffic signs, such as those used in Bangkok. Not only are there "countdown" lights at some intersections, telling you how many more seconds until the light ahead of you will change - giving you something to do while stuck waiting in a taxi - but there are LED-lit signs such as the one above posted on overpasses and up above the roadways as advisories.
Of course, you have to have to read Thai (I can not), and have some idea of where you are and where you're going, but a local can avoid adding an additional half hour or so to their ride by paying attention to the warnings and taking an alternate route when they see the street they'd intended to turn onto is lit red. I think they're a great idea.