During August 1982 a full-scale experiment was begun with the aim of studying the effect of the permittivity of bitumen on the texture depth of heavily-chipped Marshall-designed rolled asphalts. Seven sections of asphalt were laid and, apart from the differences in permittivity, the asphalts were nominally identical. The experimental sections were laid in all three lanes of Motorway M4, Wiltshire. The changes in texture depth and skidding resistance at the three traffic intensities will be monitored for at least 5 years. (A)

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