> Oh just a thought, does the calculations include toll roads? Do the
> DfT monitor these in their figures? (M6 toll, Severn Bridge etc.)
>
Yes they do. It's in the notes on the DfT website that private toll roads 
which form part of major routes are included, but private minor roads are 
not.

Incidentally, I had a go at recreating the figures for Shropshire & Telford 
motorways I referred to earlier, excluding sliproads. I've done these by 
just making a new way down the centreline of the motorway on a local copy - 
and just finding the total length.

I get 12.4km for Shropshire (spot on with the DfT figures)
I get only 9.5km for Telford (DfT 12.0km) - which suggests that perhaps the 
DfT are including some sliproads for that one, but not for Shropshire - 
maybe to do with the more complex junction 5 being included in the total - 
or perhaps each authority submits the figures to the DfT - and Telford has 
chosen to include sliproads??



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