Section 2: Definitions
Click on term to view definition in the TxDOT Glossary:
Annual Average Daily Traffic (AADT)
Average Of Ten Heaviest Wheel Loads Daily (ATHWLD)
Design Hourly Volume (DHV)
Design Year
Directional Design Hourly Volume (DDHV)
Flex 18 Kip Equivalent Single Axle Loadings
Rigid 18Kip Equivalent Single Axle Loadings
Percent Single Unit Trucks in ADT—Represents all single unit truck activity over all days of the week and seasons of the year as a percentage of total annual traffic. Single unit trucks include vehicle classes 4 through 7.
Percent Combo Unit Trucks in ADT—Represents all combo unit truck activity over all days of the week and seasons of the year as a percentage of total annual traffic. Combo unit trucks include vehicle classes 8 through 13.
Percent Single Unit Trucks in DHV—Represents all single unit truck activity for peak periods of the year as a percentage. Single unit trucks include vehicle classes 4 through 7.
Percent Combo Unit Trucks in DHV—Represents all combo unit truck activity for peak periods of the year as a percentage. Combo unit trucks include vehicle classes 8 through 13.
NOTE: Due to system constraints, at this publication, TRM does not contain traffic history records prior to the year before the current annual certified mileage year.