Dipstick

[3] The U.S. Federal Highway Administration (FHWA)[8] and the World Bank (with its International Roughness Index... or "IRI")[9] have established measurement procedures using Dipstick profiler data.

[10] The American Association of State Highway and Transportation Officials (AASHTO) has established its Standard R 41 (most recently published as R 41-05 (2010)) to, "... manually collect precision profile data utilizing the Face Technologies Dipstick.

[3][13] Although, most state DOTs now use rolling inclinometer based systems for AASHTO r56 certification procedures which collect at the same 25mm sampling interval as highway profilers.

Dipstick was used to obtain data that were used as ground truth in FHWA evaluations of the repeatability of IRI values as measured by other profilers and in Long-Term Pavement Performance (LTTP) studies conducted by several states.

The PIARC experiment was conducted in the US, Japan, Holland and Germany and included IRI values from airport runways[16] and super highways to rough unpaved roads.