Candidate for fully permeable shoulder retrofit validation site
Inertial Profiler Certification Center.
Inertial Profilers (IPs) measure the longitudinal profiles of
wheelpaths, and the resulting profiles are typically used
to calculate the pavement’s International Roughness
Index (IRI). For the past twenty years, IP equipment
has commonly been used to collect network-level IRI
data for pavement management systems. On July 15, 2013, the
California Department of Transportation (Caltrans) introduced
specifications for project-level measurement of as-built
smoothness in terms of IRI on construction projects
using calibrated IP equipment. In order to ensure
the accuracy of this IP-collected data, the equipment
must be periodically checked at controlled sites.
Previously, having California IP equipment certified
required a trip of approximately 1,800 miles to College
Station, Texas, the location of the nearest certification
center. However, in order to facilitate equipment checks
for Caltrans and other IP operators in western
states, the UCPRC assisted Caltrans with recommendations
for the set up and operation of a new Caltrans Sacramento
IP certification site, a Caltrans standard equipment
certification process based on comparisons of measured
profiles, and a process for operator certification. The
project also included set up of the new site, which
opened in late July 2013, and through October 2013 a
total of 17 operators and 9 profilers had been certified.
For more information click
Images on the right depict the six steps required for IP operator
certification and also show the location of the
Center’s new Sacramento-area site.
Important Note for Caltrans Users: Prior
to scheduling pavement preservation (preventive maintenance or CAPM) or roadway
rehabilitation work on flexible pavement highway sections, the District Materials
Engineer and/or the Project Manager should review
this spreadsheet to
ensure that the proposed project does not include sections active in
the “Quieter Pavement Research” (QPR) testing program. If the proposed
project is within a QPR test section, please
contact Linus Motumah of the
Caltrans Office of Pavement Design before scheduling the work.
To view maps that show where the sections are located, click the following
(or copy-and-paste it into a new browser window for a slightly larger view).
For more information,
contact John Harvey of the UCPRC or