(05 Feb 2024, 1:32 pm)Unber43 wrote Well if its due to a fault on the vehcile maybe they should fix the vehicle

Which they do - but you clearly don't know anything about how things work in depots during the morning run-out. There's no way you can discover a defect on a vehicle and have the fitter fix it in the time allocated for a defect check before that working leaves the depot given the allocated time for a defect check is 10 minutes. If the allocated vehicle has a defect, the driver either has to start by defect checking another vehicle or take what is called a 'hot bus' - a spare vehicle already defect checked and ready to go. End of the day, at present, most of the general public would rather have a bus turn up vaguely on time than worry if it has the features.