Pavement

The main objective of this study was to assess the profiler gain validation technique as an alternative method for validating laser profilers that measure road roughness. The study sought to identify a suitable reference profiler against which other profilers are assessed. A series of field tests were undertaken to address the main objective of this study, where the Walking Profiler (WP) was used as the reference device as a comparison to Laser Profilers A and B in measuring IRI roughness over five test sites with varying roughness and texture. These field tests did not conclusively confirm the profiler gain validation technique. The field test suggests that the profiler gain validation technique should be conducted under a standard test speed for the profiler which can be maintained and allows repeatable tracking of the profiler to minimise variation in the auto-spectral density plots.