Observing the world from a parking garage, I've seen this egg vendor, emerging from side street, courageously entering the crazy main street traffic.
Not too many traffic rules are observed in Thailand, but that is compensated by extreme politeness. Accidents still happens, nobody gets upset!
Only a slight collision would make a big omelette on the street pavement. (it is hot enough for that!).
Bicycles are left mostly unlocked.