Abstract
The performance of surfacings made with bitumens of differing permittivity is reported after 7 years trafficking. Texture depths generally increased in the heavily-chipped asphalts and in unchipped areas in the wheel paths. There was no significant correlation between permittivity and changes in texture depth occurring in the wheel paths of chipped asphalt but there was a highly significant correlation between permittivity and the development of texture depth in unchipped areas in the offside lane. Changes in texture depth and skidding resistance in the three traffic lanes correlate strongly with traffic levels. On this site, all the high-stability asphalt surfacings performed satisfactorily. (A)