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M25
Ask the london council :)
It is 5*sqrt(m).
Nine motorways intersect with the M25; J3 : M20 J5 : M26 J7 : M23 J12 : M3 J15 : M4 J16 : M40 J21 : M1 J23 : A1(M) J27 : M11
J8 (Reigate/Redhill) to J23 (A1M) is 56 miles.