In reply to:

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Nothing beats a well designed cloverleaf...

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The only cloverleaf around here[1] is notorious as the most congested junction locally, and will be removed when the Highways Agency get their way. Part of the trouble is the amount of westbound A14-A14 traffic that's crammed into one lane around the tight radius, then it's got to weave across the traffic leaving the M11-A14 eastbound before it can join the motorway. It's nasty.

[1] only 2 lobes, really