Can you flesh out what you mean by "large hazardous timber lorries" on motorways? I thought that motorways were generally suited to large lorries.
Here in the Peak District I am well aware of the issues of large (stone/cement) lorries on relatively poor, narrow, steep, winding, etc. roads, hence it is great to see the steadily increasing use of rail for construction materials. But I am not clear what the issue is with the timber flow. Is this the traditional relatively short and round logs type of timber or are we talking about massive tree trunks as 'exceptional loads' with trombone trailers, escorts and so on?