Every time you pass another bus, you will get his passengers. Since almost all inbound buses go to the same destination near the central market, and since almost all outbound buses follow the same few routes until they get well out of the center, the leapfrogging gets pretty wild. It helps to drown out the roar of the unmuffled diesel engine, and the screeching noise when you put on the brakes. Anyone who wants a little taste of the gas chambers at Auschwitz is invited to stand on the curb near the back of a diesel behemoth as it grinds into first gear and accelerates away. Pure urban, man.
Folks here claim the aisle seat first.
They do not like to crawl over each other to get in or out of the window seat. Often, the aisles will be full of standees, even though there are empty window seats. It seems to me that a sociologist could get several learned papers from this behavior. Life is too important to clutter it up with rules. There are only situations, and each will be unique, with it's own imperatives.