Purpose: Used to define truck traffic volume in LRFD projects. Also applies to LFD girder system projects when the 2003 Curved Girder Specification is used.
--> Given in girder input. Also given in bracing input in Girder System Projects.
Average daily truck traffic for use in AASHTO 3.6.1.4.2. Default is 4000, as in 3.6.1.4. for rural interstate 0.20x20000. This value of ADTT then is adjusted to ADTT(SL) according to table 3.6.1.4.2-1.