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This document presents an overview of a profiling and rut depth project. The objectives were to (1) assess the capabilities that are needed to measure profile and rut depth at highway speeds, (2) develop a design tailored to minimize life costs of the system, (3) build the system for delivery to FHWA, and (4) validate the system. A system based on the IBM PC microcomputer was designed. With the exception of a signal conditioning unit, the system is constructed from commercial components. The software controls the measurement of road profile and rut depth, the viewing of the data, and daily checks of the hardware integrity. A prototype--presently known as the PRORUT system--was built and delivered to the FHWA.
"Purdue University and the Indiana Department of Transportation evaluated the performance of a profile and rut depth (PRORUT) device developed by the University of Michigan Transportation Research Institute. Several pavement sections with different characteristics were included in the evaluation. Accurate profiles were determined with manual surveying techniques. Subsequently, the PRORUT device was operated over the same pavement sections and an analysis was made to find the variance of the results. It was found that there was a close agreement between the PRORUT profiles and the road and level profiles in all cases except for a chip and seal section. Improvements were suggested to enhance the PRORUT operation."--Technical report documentation page