(25 Feb 2015, 4:37 pm)Dan wrote Greg in Weardale has a point.
The 'formula' (total running time divided by service frequency) mightn't work if the buses have a slightly unusual interworking pattern and/or extended layover periods. For the same reason as the X70/X71, you may struggle to work out the PVR of the revised 20/20A, as they have a fair amount of layover at each end. Both can be identified without the company's running boards - you just have to be sad enough to stand at a terminus point for long enough to gather the information and work it out..!
Completely agree and i thinkthe X70/X71 is the perfect example for his point. Obviously, if you were to add the 32 min layover into the formula, you would get 4.xx or even 5. Obviously, with me not being a 'taking photos' sort of person, i dont follow this layover malarkey s much but when i get told, i certainly dont throw it out of the window.