State-of-the-art traffic speed deflectometer practice.

This report provides a brief state-of-the-art review of current traffic speed deflectometer (TSD) practice based on information gained from attending the deflection at road traffic speed workshop held in the UK in June 2012. The current state of deflection measurement practice in Denmark, USA, UK, Italy, Germany, Belgium and South Africa was reviewed. In the USA the Federal Highway Administration has developed the alternative rolling wheel deflectometer to assess network-level pavement strength. Quality assurance is seen as essential for both the construction and operation of the traffic speed deflectometer. The UK has probably the most extensive experience in quality assurance where the traffic speed deflectometer is operated under contract conditions. Laser calibration is seen as an important aspect of quality assurance. Further work to review collected traffic speed deflectometer data for its reliability and credibility can be undertaken during 2012/13 under this project. (Author/publisher)