WARRIP is investigating how pavement strength data collected using the Traffic Speed Deflectometer (TSD) can be best used in road maintenance decision making. After conducting case studies and determining best practice methods, WARRIP has used this data to develop a comprehensive road deterioration model. It is hoped that results from these evidence-based models will assist in maintenance and renewal programs under both State and Commonwealth arrangements.

Improved Decision Making Stage 4 (IDM4) seeks to determine statistically significant functionally based distress variables and structural criteria collected from traffic speed surveys that identify and initiate non-structural rehabilitation and preservation treatments on the MRWA road network.