AXLE SPACING AND LOAD EQUIVALENCY FACTORS
Weigh-in-motion (WIM) systems measure the axle spacings and axle loads for every vehicle in the traffic stream. There is a great need to estimate load equivalency factors (LEFs) from these WIM data. LEFs are approximately a fourth-power relation relative to a standard axle load. However, this ignores axle spacings, which have a significant effect. The American Association of State Highway and Transportation Officials derived LEFs for single and tandem axles, and these were extended to triple axles. Some have extended LEFs to quadruple axles, though there is no common agreement about this. However, larger axle groups also occur. Moreover, WIM data from the United States reveal a great variety of irregular and unusual axle spacings, and procedures to estimate LEFs for them are completely lacking. An attempt is made to rectify this and to estimate LEFs for vehicles with any axle spacing. An LEF adjustment method is developed, and examples are given of its use.
- Record URL:
- Summary URL:
-
Availability:
- Find a library where document is available. Order URL: http://worldcat.org/isbn/0309070511
-
Supplemental Notes:
- This paper appears in Transportation Research Record No. 1655, Pavement Management Systems and Other Pavement Design Issues.
-
Corporate Authors:
500 Fifth Street, NW
Washington, DC United States 20001 -
Authors:
- Gillmann, R
- Publication Date: 1999
Language
- English
Media Info
- Features: Figures; References; Tables;
- Pagination: p. 227-232
-
Serial:
- Transportation Research Record
- Issue Number: 1655
- Publisher: Transportation Research Board
- ISSN: 0361-1981
Subject/Index Terms
- TRT Terms: Axle load force; Estimating; Weigh in motion
- Uncontrolled Terms: Axle spacing; Load equivalency factors
- Subject Areas: Highways; Operations and Traffic Management; I70: Traffic and Transport;
Filing Info
- Accession Number: 00769359
- Record Type: Publication
- ISBN: 0309070511
- Files: TRIS, TRB, ATRI
- Created Date: Sep 2 1999 12:00AM