The conclusions reached upon completion of the Dipstick evaluation are included. The field test sites utilized in the comparisons are described. The evaluation effort describes concerns regarding the operation of the auto-read version of the Dipstick and the manufacturer's responses to those concerns. Rod and Level and the TRRL Beam are the other two Class I profiling devices specified by Appendix J. The Dipstick was chosen by the Texas SDHPT because it was believed that the device would be a cost-effective and reliable substitute for the Rod and Level survey. All of the lower classification of roughness monitoring instruments used by the states must be calibrated against a Class I device. This instrument is one of the Class I profiling devices identified in the Appendix J mandate.
This evaluation concentrates on the field performance of the auto-read version of the Face Dipstick. This report details an evaluation effort sponsored by the Texas State Department of Highways and Public Transportation Maintenance and Operations Division, Pavement Management Section.
The individual states are required to calibrate all roughness instumentation and to report that roughness in terms of the International Roughness Index (IRI).
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The Field Manual includes an Appendix J which describes the proper calibration and reporting procedures for pavement roughness monitoring. The Federal Highway Administration has produced a Highway Performance Monitoring System Field Manual as a guideline for the individual states. EVALUATION OF THE PERFORMANCE OF THE AUTO-READ VERSION OF THE FACE DIPSTICK.