RoadTrac, Inc.


Hours of Operation:
Monday – Friday, 8AM – 5PM
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Ride Quality & Construction Services

Since 1990, the Federal Highway Administration (FWHA) has required the states to report road roughness on the IRI (International Roughness Index) scale for inclusion in the Highway Performance Monitoring System (HPMS).

Today, Inertial Profilers are the choice for the FHWA, State Highway Projects, Private and State Turnpike/Tollway Authorities, and Urban Arterial Construction Projects. Each owner agengy had developed specifications that incorporate the validation and calibration of the equipment, to produce the ride indices (IRI, PI, RN) that meet their smoothness requirements. These new devices offer greater accuracy and higher production rates of measuring surface roughness and at the same time record the data in the IRI and PI mathematical format.

AASHTO has already placed the required certification minimum standards to operate an inertial profiler in its latest publication.

Ride Quality Testing Measuring Principle:

The longitudinal profile measurement is based on the "Dakota" method. An accelerometer is used to obtain vertical vehicle movement, and a laser sensor is used for measuring displacement between the vehicle body and pavement. Road profile measurements are then obtained by separating the body movement with the appropriate body displacements. IRI is calculated in accordance with World Specifications. The Measured longitudinal profile meets the Class 1 profile and bias specifications as defined by ASTM E-950.

Our Inertial Profilers are carefully designed to provide an advanced, automated, high-quality pavement roughness and related measurements solution for engineers nationwide. The profiler is capable of real-time continuous highway-speed measurements of longitudinal profile (International Roughness Index (IRI) and Ride Number (RN)), transverse profile, bumps, profile index (PI) number, rut depth, faulting, macro texture and geometrics (cross-fall, curvature and gradient). Measurements can be referenced with linear chainage or GPS, allowing easy integration to GIS.

Advantages of Using RoadTrac:

  • Guaranteed high accuracy according to rigorous standards.
  • Measurements taken at all traffic speeds.
  • Easy calibration feature.
  • Designed by pavement specialists.
  • All indices are computed in real-time.
  • Data collection in urban areas with "stop and go" feature.
  • IP manufacturer's nationwide support network.


RoadTrac's purpose is to provide a certified testing service to general contractors working under their State's smoothness requirements. We have offices strategically located all over the United States and serve clients all over the South and the Mid-Region. From Georgia to California and as far North as Wyoming and Ohio.

RoadTrac's commitment to quality, support and product integration will continue to play an essential part in RoadTrac's strategy.

E-mail us for more information about our road-testing services for ride quality and construction.

Red Car on a Road

RoadTrac, Inc.