Not only is Chanthaburi famous for its gemstones, although I don't think they have any quality gemstones left but it is also famous for its fruits and the poxy traffic jams they cause.
The traffic jams are caused by the poxy fruit sellers and buyers, ie a fruit seller will park his pick up on the hard shoulder to set up shop so to speak and sell his fruit from the back of his truck, then another fruit seller will double park next to him to negotiate swapping a small amount of his fruits for a small amout of the other guys fruits, then you get Mr Retard triple parking next to him to purchase a kilo or 2 of fruit, yep they got about 3kms of parked and double parked trucks on the highway
Anyway this is one of the better places, ie a market with off road parking that doesn't force you into endangering yourself or other drivers, although of course you still get the motorbikes travelling in the wrong direction but they don't like playing chicken down that way, suppose they haven't got the drug problems down there like we have in Pattaya.