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Roughness (IRI) / Longitudinal Processing

Surface roughness, in particular reported in relation to an International Roughness Indicator (IRI) value, is a key performance indicator being used widely around the world including the Federal Highway Administration’s (FHWA) Highway Performance Monitoring System (HPMS). Reporting such information to FHWA is a key requirement for U.S. States.

Fugro Roadware’s Laser SDP/2 (South Dakota Profiler) is a Class I profiling device under ASTM E950 and has been proven over a large range of agency requirements including TTI and AASHTO R56-10 certifications.

Depending on our clients' needs or budget, Fugro Roadware's Laser SDP system has the flexibility to deliver many different sensor options including:

  • Selcom 16, 32 and 64KHz. lasers
  • RoLine - 4" (100mm) footprint line laser (proven accurate readings for tined concrete)

Each of these sensors continuously measures the longitudinal profile, and calculates in real-time, pavement roughness indicators such as IRI, MRI, HRI, and Ride Number (RN) for 100% of the driven lane in accordance with ASTM Standard E1926.

Does you agency have problems getting roughness data in low-speed, stop and go environments or areas where there is not a long enough lead-in?

Fugro Roadware has developed reliable, speed-sensitive filters which improve the accuracy of the longitudinal profile calculated during these type of environments. They reduce the impact of the unwanted frequencies in the accelerometer signal which affect the profile (and International Roughness Index) calculation. This allows our customers to get as much roughness data across their network as possible.

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