The Utah Department of Transportation (UDOT) collects data for the State Highways and Local Federal-Aid roads. Traffic is measured in both directions and reported Annual Average Daily Traffic (AADT). AADT is collected for major intersections and "sections where traffic volumes show a substantial increase or decrease." The busiest section of SR-129 is between Geneva Road (SR-114) and Pleasant Grove Boulevard (SR-135), with an average of 21,000 vehicles per day. The least busy section of SR-129 is between 700 North and Cedar Hills Drive, with an average of 10,000 vehicles per day. Since 2008, traffic along the busiest section has increased an incredible 2,000 percent and traffic on the least busy section has increased only 8 percent.
