Transition from manual to automatic rutting measurements : effect on pavement serviceability index values.
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2010-06-01
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Abstract:The Pavement Serviceability Index (pSn is used by New Mexico Department of Transportation
(NMDOT) to express the serviceability level of a pavement section at the network level. The PSI
is calculated with distress ratings (including rutting) and roughness data. Currently, rut depth
data collected with two NMDOT-owned 3-point profilometers are not used as an input in the
calculation of PSI values. The main goal of this project was to develop and recommend a
procedure to substitute automated rut depth for rutting ratings from manual surveys. For planning
and reporting purposes, it is important for NMDOT to maintain the consistency of the methods
and data used to calculate PSI values and to docwnent any change implemented so that
comparisons of current and past conditions and performance evaluations of the network can be
made. The transition from using manual survey ratings to automated rut depth measurements
should introduce the smallest possible difference in the calculated PSI values and the overall
condition rating of the highway network. Three procedures or approaches are presented and
discussed. Regression analyses were applied to the rut depth and PSI data. Recommended
Approach A proposed preserving the current PSI formulation and factors and converting the
automated rut depth data into equivalent rutting ratings. Alternative Approach B proposed minor
modifications to the PSI formulation. A third approach (Approach C) was considered and
evaluated, but was not recommended. Results of the statistical tests performed on the data and
results are also presented. The ratings from manual surveys and automated rut depth data were
compared with detailed measurements of transverse profiles to evaluate the data from these two
methods. This report includes an implementation plan for the recommended and alternative
approaches.
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