In the warm weather, riding on the bus can offer a bit of relief from the heat of the sidewalks. When waiting for the bus, if the sun is really pelting down, I sometimes stand in the tiny patch of shadow cast by the bus stop sign.
On board, the narrow vents at the top of the windows offer the only breeze unless you stand by the middle doors and wait for them to open. I immediately flip open a vent if possible.
I love the rules posted about windows.
A moot point, unless you happen to resemble Mr. Tickle.
Opening and closing of windows
You may open or close the windows according to your desire. In case of disagreement among the passengers, priority is given to whoever wants to close the window.
Imagine the scenario.