Yes, every bus driver ‘in the world gets a book of rules on his first day at the job’ but passengers learn about them the hard way. Lekhni lists them:

Rule #3 is to load up with as many passengers as possible. In Bihar and other states, even the roof is considered a seat, but in other states people disdain the roof and think it is cool to hang out of the window bars. Perhaps we should send some of these people to try out for the Roman Rings.

Rule #4 is to travel as slowly as possible. The ideal speed is just a tad above the speed of a fast walk. So a passenger will be marginally better off staying in rather than walking. Although, he/she will look longingly out of the window and wonder if getting off would be a better idea.