Equivalent Single Axle Loadings ( ESAL ) for Pavement Design
The Highway Equivalent Single Axle Loading or ESAL Reports are prepared by Alberta Transportation for the use of consultants undertaking pavement designs for Alberta Transportation.
The ESAL calculations in the reports are based on periodic turning movement counts and annual average daily traffic determinations. Normally the turning movement studies performed to determine truck percentages are done in the summer months. There are unique circumstances when these counts are done in winter months on known resource roads which may distort the average annual ESAL on the road. Users are cautioned on using these ESAL values for pavement design.
ESAL values in the history reports may fluctuate from year to year. The purpose of the ESAL history reports is to allow the consultants undertaking the pavement designs to evaluate the reasonableness of the present ESAL value. Significant increases or decreases in ESAL values need to be considered in conjunction with specific knowledge of the roadway and overall engineering assessment. Users are required to use sound engineering judgment to determine the present ESALs to be used in the design process as documented in the department's "Pavement Design Manual".
The reports present statistical information on traffic volumes, vehicle classification, travel and ESALs on Alberta's Highway Network. These statistics are given as weighted averages over entire highways, control sections and traffic control sections. These statistics are estimated from data collected for Alberta Transportation by its contractors.
For traffic statistics at specific locations of concern (such as winter resource roads), please contact Orlando Rodriguez with Alberta Transportation by email at email@example.com or by phone at 780-643-1723.
For ESAL statistics within cities, contact the Transportation Department within the appropriate city.
Abbreviations (PDF 8 K)
Definitions (PDF 10 K)
Weighting Procedure for Traffic Statistics (PDF 10 K)
Legal Description of Locations (PDF 9 K)
Municipal Codes (PDF 9 K)
Alberta Highway Historical ESAL Report (PDF 298 K)
Alberta Highway Historical ESAL Report (Excel 596 K)
Documents on this site require Acrobat Reader, available for free from Adobe.