Traffic speed deflection devices (TSDDs) are designed to measure pavement deflections or deflection velocities in response to loads applied by trucks moving at or near prevailing traffic speeds.
TRB's Transportation Research Circular E-C276: State Departments of Transportation Experiences and Applications with Traffic Speed Deflection Devices details a 2019 workshop, Workshop on the Use of Traffic Speed Deflection Device Data in Network-and Project-Level Pavement Decisions, which brought together six national and international experts on the subject who shared their thoughts, experiences, and vision for the future of TSDDs. The E-Circular is available from the US Transportation Research Board web site at https://www.trb.org/Main/Blurbs/182655.aspx
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