We wouldn't see this road build finished till roughly 2010 by the time they plan it, compulsary purchase land and then build it.
Most likely true, M_W_UK, but you forgot to add on the inevitable planning enquiry that will precede the planning stage.... and since anything to do with improving airports these days is about as popular as Mother Theresa in a whorehouse, then I'd add a few more years to your estimate, unfortunately.
I've said this before tho - the road is an excuse. The lack of growth at Cardiff is always held up to be due to the road, but being honest, there are many airports in the UK with sharply WORSE access, and they do better than CWL. I'd point the finger somewhere else... have a reread of Caaaardiff's postings, I won't repeat their thoughts!
BTW - people who suggest that baby could/should do Paris with a 737 need a lesson in airline economics, I am afraid... ditto BRU.
TA