There are two types of buses which operate within major cities.
Most people have to stand.
These buses are very frequent and people don't worry about bus timetables. If you miss one, you know that there will be another within a few minutes. At some major bus stops there are bus information stands, which tell you which bus to take when you push the button right next to the place of your destination. These days, a new type of the regular bus is being operated and for this type, it is not necessarily true that there is only one row of seats up each side of the bus. And these new type regular buses are air-conditioned.