I was on a London bus a few years ago where it quickly became clear that something was going wrong.
After I got on someone pressed the bell, which lit up the Bus Stopping sign and I would have thought the bell dinged quite loudly (I guess you may not always hear it in the cab). The driver zoomed past the next stop, which resulted in lots of pressing of the bell, enough that other drivers would start shouting through the microphone.
The driver zoomed past the second stop as nobody was waiting outside, which finally prompted one of the ten or so passengers who wanted to get off to shout HELLO??? STOP PLEASE. The driver shrugged his shoulders and said something like nobody pressed the bell, and just continued to the third stop.
Where this got bizarre is that after all the passengers wanting off finally alighted, the same scenario happened again over the next three stops. I would have thought the driver would realise that his indicator wasn't working and then slow down at every stop for the rest of the route... I got off at the sixth stop so don't know if he finally got the picture after that.
A wheelchair passenger had wanted the fourth stop, and pressed the blue bell. After her stop was missed she said wasn't too bothered, she'd just ride to the end and come back! It would avoid having to cross the road as her home was on the other side...