This is a research report that provides data allowing one to define an international scale of friction values called IFI. This report is primarily intended for research institutions. It rests with the national road administrations and/or the standardization organizations to evaluate the benefits of using IFI in their applications, specifications, or standards. The skid qualities of pavements play an important role in road safety. Road surfacing must ensure an adequate level of friction at the tirepavement interface to provide safe operation of vehicles. It is recognized that methods and systems used throughout the world for measuring texture and skid resistance vary significantly. It is for this reason that the PIARC Technical Committee on Surface Characteristics decided to undertake an international experiment to compare and harmonize texture and skid resistance measurement.