Smoother roads, which translate to better ride quality, are the public’s number one transportation demand. According to the Federal Highway Administration and the National Asphalt Pavement Association (NAPA), smooth roads last longer, are safer and save money because they require less maintenance.
PROFILOGRAPH TESTING accurately measures surface roughness through a computerized recorder capable of graphing a pavement profile both vertically and horizontally. The information it collects is used to calculate the International Roughness Index (IRI), which is expressed in units of inches/mile or millimeters/meters. An IRI value of 0 (zero) is equivalent to driving on a plate of glass. High ranges, upward to several hundred inches in a mile, indicate a very rough road. The Profilograph also measures a pavement’s cross slope, allows bi-directional testing and multiple wheel path reporting, and can append data to existing files, which improves tracking and correlations throughout a project.