AASHTO PP 107:2021 Standard Practice for Assessment of Body Motion Cancellation in Transverse Pavement Profiling Systems. This practice describes the procedure to assess the accuracy and precision of the transverse pavement profiler (TPP) when the system is excited at the primary ride and wheel hop excitation frequencies. The particular specification which will be assessed is vehicle body motion error. The minimum requirements focus on the need for accurate and repeatable transverse measurements for network- and project-level data collection. if any part of this practice is in conflict with referenced documents, such as ASTM standards, this practice takes precedence for its purposes. This standard practice is intended to be conducted in conjunction with three other standard practices to fully assess and certify the TPP in typical operating conditions. For static assessment, see PP 106; for ground reference and transverse width assessment, see PP 109; and for assessment of drift mitigation, see PP 108. 4 SIGNIFICANCE AND USE Measured transverse profiles of road surfaces are used to extract pavement deformation parameters such as rut depth, cross slope, and edge/curb drop-off. The accuracy of the estimated pavement deformation parameters depends on the collected data accurately representing the transverse section of’ the road surface. 4.2. Requirements on the cancellation of vehicle body motion ensure that the TPP is effectively cancelling out the motion of the vehicle body and the resulting collected data accurately represents the road surface. 4.3. This practice outlines standard procedures for assessing the expected operational accuracy and precision of transverse pavement profilers when driving over rough road surfaces. The standard prescribes a procedure to evaluate the ability of the system to accurately represent a planar surface through multiple transverse profile measurements (a single point cloud) captured while the vehicle is subject to primary ride and roll excitations at a set range of speeds. Because the data are used for subsequent calculations for rut depth. cross slope, and edge/curb drop-off, tables of the necessary accuracy and precision for certification are provided in the form of bias and confidence intervals for each use.AASHTO PP 107 pdf download.
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