(25 Feb 2015, 4:29 pm)Greg in Weardale wrote You can't really calculate PVR by a formula, and it's not necessarily possible to do it manually via the timetable as you don't know when buses may appear off other routes. You really have to have access to the companies' driver boards.
You can and it works most of the time but obviously you cant be certain it will work 100% of the time.