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Title:

NCDOT Quality Control Methods for Weigh in Motion Data

Accession Number:

01154604

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States

Abstract:

State Departments of Transportation collect traffic data every year to support pavement design, to enforce weight restrictions on highways and bridges, and to provide planning data for highway improvements. Reliable weigh in motion (WIM) data is particularly important to provide Level 1 and Level 2 truck traffic data for the FHWA Mechanistic Empirical Pavement Design Guide (MEPDG). After the NCDOT collects WIM station data and converts it from proprietary vendor format to an ASCII text format, the quality of the data must be checked. During the quality control (QC) procedures, tests identify incomplete data sets, out of range values for individual vehicle classes, and other possible data problems. This paper documents how the NCDOT QC checks are programmed in Access and applied to one year of calibrated data for each WIM station. The software includes automatic checks that flag and report questionable data. It also facilitates manual checks and visual interpretation of the data using local knowledge of the WIM sites. After performing QC for 45 WIM stations, there were about 100 databases stored in approximately 50 gigabytes of data including plots, reports, and tables. The QC results confirmed that NCDOT equipment captured reliable WIM measurements. Vehicle class and weight checks generate 0.97% and 6.42% anomalies, respectively. Average QC run-time was 60 minutes per WIM station. Manual inspection of questionable data further clarified the results finding that only three WIM stations had more than 10% flagged weight records with a majority of them caused by vehicle misclassifications.

Monograph Accession #:

01147878

Report/Paper Numbers:

10-2304

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Ramachandran, Aditya N
Taylor, Kent L
Stone, John R
Sajjadi, Soheil S

Pagination:

13p

Publication Date:

2010

Conference:

Transportation Research Board 89th Annual Meeting

Location: Washington DC, United States
Date: 2010-1-10 to 2010-1-14
Sponsors: Transportation Research Board

Media Type:

DVD

Features:

Figures (7) ; References (14) ; Tables (4)

Subject Areas:

Administration and Management; Data and Information Technology; Highways; I10: Economics and Administration

Source Data:

Transportation Research Board Annual Meeting 2010 Paper #10-2304

Files:

BTRIS, TRIS, TRB

Created Date:

Jan 25 2010 11:04AM