No. Sometimes bus drivers have to go through traffic problems, construction detours, or first responders that have emergencies that they have to attend to or other might be a situation on the bus, such as someone might get sick and they have to wait on first responders and the driver supervisor. The bus might break down.
In my experience they are rarely late. When late traffic is heavy or road construction somewhere and you'll definitely miss your connecting bus.
Thanks! Your answer is awaiting moderation.