CASE STUDY Structural Monitoring: A21 Tonbridge to Pembury CLIENT: HIGHWAYS ENGLAND / BALFOUR BEATTY THE CHALLENGE The old A21 single carriageway, located just south of Tonbridge, is a 7.3Km long piece of highway which carries 35,200 vehicles every day. The road was never designed to carry this volume of traffic and a solution was required to relieve congestion and improve on the safety and journey time for road users. As part of a £15B government road investment strategy a dual 2-lane carriageway, broadly following the line of the existing A21, was proposed which will also carry a bridleway for pedestrian and cyclists. As part of this dualling scheme, Highways England also required a system to detect any potential movement of two new reinforced earth bri

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