United States Department of Transportation
i
Verification of Rut Depth Collected with the INO Laser Rut Measurement System: Executive Summary Report
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2011-11-01
[PDF-167.85 KB]
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Edition:Executive summary report.
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Abstract:Since 1985, ODOT has been manually collecting rut
depth data using a straight edge and dial gauge (S&G). This
method is slow and dangerous to pavement condition raters
when traffic control is not available. According to the
Pavement Condition Rating (PCR) procedures, the rating
team is instructed to stop at 1 mile intervals along the
predetermined roadway section and evaluate a 100 ft (30.5 m)
section of pavement. While this method may be sufficient in
many cases, there is potential for raters to overlook short
sections of deeper than typical rutting. Also, there have been
numerous instances, according to ODOT Infrastructure
Management workers, when the level of traffic prevented
them from obtaining the necessary number of rut depth
measurements to properly evaluate a pavement section. To
solve this problem, ODOT purchased two inertial road
profilers; one from Pathway Services and one from Dynatest.
Both vehicles use rear-mounted INO Laser Rut Measurement
Systems (LRMS). These systems utilize two 3D laser
profilers and allow the collection of transverse road profiles
and calculation of rut depth measurements while the vehicle
is in motion, even at high speeds. With the LRMS, numerous
rut measurements can be obtained at short intervals over the
entire section in a much shorter period of time. The safety
risk for the rating team is greatly reduced because they can
obtain measurements without leaving the vehicle and without
interfering with traffic flow.
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