Operation of articulated buses in the North West

[Valandil]

RE: Arriva North West - St Helens Depot
I think whether or not there are no bridges low enough to exclude deckers, no deckers should operate out of Runcorn because what if there's a diversion or they have to interwork or the management would like to change the route slightly?
The whole area is full of low bridges so even one small change could thwart the whole operation.