Division of PlanningOffice of Technical Services
Infrastructure Management staff operate two skid test units or skid trucks that measure the friction between rubber tires and pavement on wet roads. Skid test units consist of a one-ton crew cab pickup pulling a specially designed two-wheel trailer. The truck travels down the road to be tested at a steady velocity, almost always 40 MPH. At the appropriate time the system is activated and the automatic skid cycle commences. Water is pumped out in front of the trailer test tire. In ODOT's case, this is the left tire. A very powerful braking system locks this wheel and sensitive instruments measure the horizontal and vertical forces acting on this tire.
Click here to view a video demonstrating skid testing.
Request a Skid Test, by filling out the form below. Depending on workload, crew availability, and maintenance factors with the truck, scheduling of skid testing can usually be made within a couple weeks. The data is then processed in the office and sent to the requesting agency shortly thereafter. Priorities are given to requests deemed extremely important or emergencies.