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The development of a new Norwegian device for the measurement of road roughness started in 1985. A prototype is now finished. Tests demonstrate that longitudinal profiles of wheeltracks measured with this equipment meet the requirements to qualify as “Class 1: Precision profiles” , which represent the highest standard of accuracy for measurements of the International Roughness Index (IRI).
The longitudinal profile is given as elevation points with 25-cm spacing along the measured wheeltrack, and different criteria for road roughness can be computed from this profile. In February 1988, necessary software was completed to compute IRI as described by The World Bank . In addition, computed straight-edge values can be presented as histogram for any section length chosen by the operator.
The measurements are independent of traveling speed, and the calibration of the equipment is very simple. The production of the first series of the equipment will start in 1988, and it will be used both for detailed studies on test sections and for road network surveys in Norway.
evenness, road roughness, equipment, measurement, straight edge
Senior research engineer, Norwegian Road Research Laboratory, Oslo 6,