Ride Quality Follow-Up

TL;DRAbstract

The New Jersey Department of Transportation (NJDOT), as many other DOT’s, moved towards utilizing a high-speed profiler to measure the International Roughness Index (IRI) as a part of the state smoothness acceptance specifications. Although high-speed profilers have been in use for a long time as a tool to collect network-level IRI data for Pavement Management System (PMS) applications, the use of this type of device for project-level smoothness acceptance is relatively new. Therefore, NJDOT conducted a two-phase research study with the objectives of standardizing the testing protocols and identifying/addressing the equipment related issues, such as repeatability, effects of testing speed and the use of high- and low-pass filters, manufacturers versus standard IRI computations (Proval and RoadRuf) and the impact of summary intervals. Also, the study objectives included selecting a pavement profiling device as the Standard Pavement Profiler (SPP) for NJDOT, which will be used to calibra

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