Journal Published Online: 20 February 2020
Volume 48, Issue 3

Mechanistic-Empirical Compatible Traffic Data Generation: Portable Weigh-in-Motion versus Cluster Analysis

CODEN: JTEVAB

Abstract

Axle load distribution factors (ALDFs) are used as one of the primary traffic data inputs for mechanistic-empirical (ME) pavement design methods for predicting the impact of varying traffic loads on pavement performance with a higher degree of accuracy than empirical methods that are solely based on equivalent single axle load (ESAL) concept. Ideally, to ensure optimal pavement structural design, site-specific traffic load spectra data—generated from weigh-in-motion (WIM) systems—should be used during the pavement design process. However, because of the limited number of available permanent WIM stations (in Texas, for example), it is not feasible to generate a statewide ALDFs database for each highway or project from permanent WIM data. In this study, two possible alternative methods, namely, the direct measurement using a portable WIM system and the cluster analysis technique, were explored for generating site-specific ME-compatible traffic data for a highway test section, namely, state highway (SH) 7 in Bryan District (Texas). The traffic data were then used for estimating pavement performance using a ME pavement design software, namely, the Texas Mechanistic-Empirical Thickness Design System (TxME). The TxME-predicted pavement performance (e.g., rutting) using the portable WIM-generated traffic input parameters closely matched with the actual field performance. Overall, the study findings indicated that the portable WIM (with proper installation and calibration) constitutes an effective means for rapidly collecting reliable site-specific ME-compatible traffic data.

Author Information

Walubita, Lubinda F.
Texas A&M Transportation Institute (TTI), College Station, TX, USA Department of Civil and Environmental Engineering, Universidad del Norte (UniNorte), Barranquilla, Colombia
Fuentes, Luis
Department of Civil and Environmental Engineering, Universidad del Norte (UniNorte), Barranquilla, Colombia
Faruk, Abu N. M.
Advanced Infrastructure Design, Inc., Hamilton, NJ, USA
Komba, Julius J.
Department of Transport Infrastructure Engineering, University of Pretoria/Council for Scientific and Industrial Research (CSIR), CSIR Smart Mobility, Pretoria, South Africa
Prakoso, Adrianus
Texas A&M Transportation Institute (TTI), College Station, TX, USA
Naik, Bhaven
Department of Civil Engineering, Ohio University, Athens, OH, USA
Pages: 16
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Stock #: JTE20190745
ISSN: 0090-3973
DOI: 10.1520/JTE20190745