RoadTrac, Inc.
Your Certified Ride Quality Testing Agency
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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.

The Dynatest Road Surface Profiler (RSP) is carefully designed to provide an advanced, automated, high-quality pavement roughness and related measurements solution for engineers nationwide. The RSP 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. 
  •  All indices are computed in real-time. 
  •  Measurements taken at all traffic speeds. 
  •  Data collection in urban areas with "stop and go" feature. 
  •  Easy calibration feature. 
  •  Dynatest worldwide support network. 
  •  Designed by pavement specialists.

RoadTrac's purpose is to provide a certified testing service to general contractors working under their State's smoothness requirements.  We have Offices in Texas and Colorado and serve clients all over the United State's Mid-Region.  From Georgia to New Mexico and as far North as Wyoming                                 

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.

Testing SH 79 on Zack Burkett project

RoadTrac, Inc.