Had one double decker bus that was too tall to go under the railway bridge at Hitchin so we had to go the long way round.
other occasions we had to give the driver directions how to get to welwyn north! (some of us were tempted to direct him onto the A1M for a quick trip to Stevenage) other drivers have left WGC in the wrong direction. Also the WAGN replacement the coach from Stevenage to Potters Bar that called at Hertford North & Cuffley on the way taking ages in the rush hour traffic!
Must be something about that area - I had one which covered my late night journey back to WGC from Letchworth many moons ago - and he took the most circuitous route in WGC I've ever known. Went miles out of the way, totally unnecessarily.
The Hitchin one I get, because that bridge is very, very low (Hitchin depot had a couple of low height Bristol VRs that could fit under, but not much else could - the other bridge in that area which used to cause problems was the one under the ECML at Wymondley - and was the reason why London Country (as it was back then) couldn't use Atlanteans on services between Stevenage and Hitchin, so the lucky passengers on those routes had the delights of Leyland Nationals until the Olympians arrived in about 1983.......
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Milton Keynes Central - Northampton via every back street in Wolverton that the coach barely fitted down taking about 45 minutes to get there, then back down to the A509 (basically MKC) again and over to the M1 to go up to Northy. Got there after about an hour and 50 minutes. Driver literally stopped in Wolverton to ask directions at one point.
I sort of get that one though - if you don't know your way round MK the logical way is back to the M1 and up one junction to Northampton.
Someone with a bit of local knowledge would be able to find their way to the A508 from Wolverton, but it's not straightforward.
The alternative of head to Newport Pagnell and up the back road is OK, but if I were driving a coach, I probably wouldn't fancy it.