Food vendors
In every town or village you will come across mobile food sellers. They sell almost every variety of food consumed within Thailand. They work extremely long hours, and often haul their heavily over-laden barrows over several kilometers of pot hole ridden, uneven streets, quite often dicing with heavy traffic and pollution.
Despite this they are often very friendly people. For the amount of hours they work their income is very low, an average dish will cost between 25 - 40 baht. You can usually tell when they are coming as they will toot a little rubber horn or ring a bell. How many of you living here can get the little tune the ice cream person plays as they trundle around. I know I can't.
On every street you will most likely see great plumes of smoke bellowing from a barbecue strapped to the side of a motorbike, hot embers spitting out in every direction, an inverted fan being used to clear the air (up to a point)I've wandered the back streets of several cities and towns within Thailand, and within them you will find food vendors cleaning great big aluminium pans and pots, clanging them around in great big plastic tubs, getting ready for the next days trading, when they will be up at the crack of dawn to visit local markets for the days stock.
You can usually find something to eat at any hour of the day or night. As a general rule its a good idea to look for cleanliness before ordering, that said I can personally can state that over the 4 years I have been living here in Thailand, I have never been sick as a result of bad food off a street food vendor.
They nearly always sell good cheap food, and as an added bonus serve it with a big smile. Times however have changed, and the opening of big conglomerate food chains has no doubt had its impact on their income.