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Abstract:Pavement markings provide an important means of communication for all roadway users and must be capable of
conveying information during inclement weather and evening hours when there may be little to no contribution from
overhead lighting. Recently the Agency has been applying recessed polyurea markings on most interstate rehabilitation
projects. Recessing has proven effective in extending the service life of pavement markings by protecting them from
wear induced by tire abrasion and shearing effects generated by snow plows. This research was conducted to evaluate
the application of an experimental pavement marking, known as Epoplex Glomarc 90 Polyurea, with respect to long line
application.
The Epoplex Glomarc 90 Polyurea was applied on the Derby IM 091-3(46) project, located along I-91 northbound and
southbound between mile marker (MM) 169.8 and 177.4. Five test sites were established in the southbound lanes of the
project, all of which were experimental. Following the placement of the markings, retroreflectivity and wear readings were
collected using uniform methods. Retroreflectivity readings were taken on each line (white edge, white skip, yellow edge)
within the southbound test site limits using the LTL 2000 Retroreflectometer. Each test site is 40 feet in length, with
readings sampled every 10 linear feet. White skip lines that coincide transversely with any sample point were also tested.
All markings were found to be in compliance with FHWA recommended minimum Retroreflective values, and above the
Agency’s required initial retroreflective values of 500 mcdl/m
2
/lx for white, and 400 mcdl/m
2
/lx for yellow. The most
notable observation during the site visit was that on average, the yellow markings were presenting higher retroreflective
values than the white lines. Research personnel will continue to monitor and collect additional information concerning the
overall durability and retroreflectivity of all test sites in accordance with the work plan.
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