Traffic Speed Deflectometer

Traffic Speed Deflectometer (TSD) is a rolling wheel Deflectometer for network level bearing capacity measurement. TSD uses patented Doppler technology to measure pavement deflection while travelling at normal traffic speed - up to 80 km/h (50 mph)

TSD data provides continuous pavement deflection profiles, from which bearing capacity indices can be derived and pavement fatigue / residual life can be estimated. The high accuracy and resolution makes TSD perfect to pin point locations with bearing capacity deviations. This information allows you to plan exactly from where to where to repair.

TSD can be combined with subsystems collecting functional data simultaneously and synchronized with structural data.

Traffic Speed DeflectometerProfilerLaserProfLaserProf BikeLaneTrailerRight-of-Way ImagingSurface Imaging System


• Measures the bearing capacity at traffic speed
• High measuring capacity
• More economic per measured distance
• Measures the pavement response to design axle load
• Authentic load
• High accuracy, repeatability and reproducibility


• Capable of scanning a road network and point out sections, which need to be considered more carefully.
• Routine testing equipment


• Special trailer that allows for varying of the load
• Standard truck
• Deflection obtained using doppler lasers
Product pages
Traffic Speed Deflectometer
PDF: 1.4 mb
Traffic Speed Deflectometer
Display Examples
PDF: 3.9 mb
Traffic Speed Deflectometer
MnRoad Project
PDF: 2.1 mb
Traffic Speed Deflectometer
PDF: 2.1 mb
Traffic Speed Deflectometer
FWD User's Group 2012
PDF: 8.8 mb
Traffic Speed Deflectometer
ARRB 2010
PDF: 508.4 kb
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The Traffic Speed Deflectometer is patented under the following patent numbers: 819196 in Europe, 694347 in Australia, 6119353 in USA and 3850875/3851342 in Japan.