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 concei

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.