at bus "request" stops the bus does not have to stop which means during slack periods it gets ahead of schedule so it either slows down or waits at a bus "stop" till its designated time appears before it proceeds.
look at the bus stop to see if the sign reads request or stop.
I only use the 163 route around Formby, it runs on a circular type route, passes my front door every hour at twenty minutes past the hour. All us old grumpies get it because we don't have to pay and it is like a ride around town for nothing. isn't that great? We pass a shop full of tinned tomatoes as we go round in ever decreasing circles. Good job it stops running overnight innit?
That still happens. On the 607 route Shepards Bush to Uxbridge, it is supposed to be an express bus with limited stops. It has this habit of stopping and an announcement comes on saying "This bus will stop here for a few minutes to regulate the service" you then find that all the other local buses, the 207, 83 and the 427 go flying by and we are stuck there like Muppet's, I'm a bit picky on what bus I catch now, express isn't always express.
Probably a case of 'More than me job's worth' to not stick to the timetable. Mind you if ronalddonald got to the bus stop at the correct time and saw the bus disappearing into the distance he would be complaining again.