(26 Nov 2021, 7:59 pm)Dan wrote Presumably buses are travelling at such slow speeds that it doesn't pose a risk.

It's a different scenario to when double-deck buses were running on the X9/X10 (A19 is very exposed to the wind, travelling at high speeds of 62mph). As mentioned above, some of the faster routes in Northumberland probably pose a greater risk to Arriva.