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What's the longest A-road in the UK?

i was wondering this the other day, anyone got a definitive answer? it has to be a continuous road, called the same thing all the way. the A39 surely has to be a contender, i *think* it's continuous from the A30 junction down near Falmouth to just outside Bristol...

If you're new please join in and if you have questions pop them below and the forum regulars will answer as best we can.

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