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by Paianni 2000 days ago
It's an okay system but apathy has resulted in abnormalities, such as the A5-M1 Link Road leaving a bunch of routes in Dunstable out of zone. The A14, as conceived in the 90s, has always started out of zone because that was the easiest two-digit number to steal from another route. Many old A-roads have been chopped into pieces because of motorway replacements or to encourage heavy traffic to use more suitable routes, the end result is a bit of a mess nowadays.
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There is, of course, a wikipedia page for this as well: https://en.wikipedia.org/wiki/Anomalously_numbered_roads_in_...