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UNEXPECTED SIDE effects of multi-million pound anti-subsidence measures on the M6 could mean many more months of speed restrictions on one of the UK's busiest motorways The Highways Agency confirmed this week that it would have to carry on with a 50mph speed limit imposed between Junctions 3 and 4 in October (NCE 25 October 2001) because ripples are still forming on the road surface, making it dangerously uneven.