Supervisor: Jeff Yunker - (208) 334-4490           Friction testing is performed by ITD to measure the skid resistance of existing road surfaces. The information is used by planners, designers, and maintenance to determine the need for and type of repairs or reconstruction to make the road safer. The light weight profiler used for project smoothness data collection. It may be used in project development or to perform Quality Assurance testing of the Contractor's data. It's equipped with Roline lasers for use on both asphalt and concrete pavements, dual lasers to collect data for both wheel paths, and also with GPS for data location. Operation speed is approximately 15 mph so projects may be profiled with rolling traffic control and minimal disruption to traffic. The lightweight profiler meets AST E950 Class I requirements. Friction testing is performed on a network level basis meaning that all highways receive testing on a regular schedule. The friction numbers, a value typically between 20 - 100, represents the friction experienced by tires traveling on the pavement surface while wet. The lower values indicate lesser friction between the pavement and the tire. These values are obtained using a locked wheel skid trailer. The FWD consists of a trailer mounted non-destructive pavement testing unit towed behind an F-250 Super Cab pickup. The FWD is used to test roadway pavements throughout the State of Idaho for the purpose of pavement rehabilitation design. Results of this testing may provide an indication that a pavement preservation technique is more appropriate. Data collected from this equipment is used to evaluate the strength of both flexible (AC) and rigid (PCC) pavements. The evaluation includes base and subbase materials, checking load transfers across PCC joints and detecting voids under the pavement. FWD testing provides a tool for designing more efficient pavements.
Pavement Testing Schedule