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IT would be a pity if the correspondence in your columns from the Freight Transport Association (CM June 10, July 15) and the Civic Trust (CM May 27, June 24), which has revealed such interesting information, was allowed to end by going round in a circle.
Mr Turner of the FTA, has quoted Transport and Road Research Laboratory Report 582, to the effect that heavier lorries need cause no more vibration than existing lighter ones, without making the important proviso that this depends on the heavier lorries having a superior suspension system. The importance of the proviso was the very point made in the first letter from the Civic Trust (CM May 27). Unfortunately, a good suspension system — from a ground-borne vibration point of view — cannot yet be specified.
What has emerged from the figures exchanged in your columns is that a single 40-tonner clearly does more
road damage than a 32-tonner but that, per tonne moved, there is not much to choose between the two. If the FTA want t, argue that there will be les overall road damage with the use of 40 tonners, the will surely need to produce rather more convincing figures.
A. F. HOLFORD-WALKER, Council for the Protection Rural England, London.