Better Roads Digital Magazine
Issue link: http://read.dmtmag.com/i/440996
RoadScience
10 December 2014 Better Roads
ervation are not as readily recognized as for lower volume
roads," he said. "But preservation of high-traffi c volume
roadways is just as important as for low traffi c volume road-
ways. States have limited resources, and preservation makes
those resources go farther."
The objectives of the SHRP2 R26 project were to develop
preservation guidelines for high traffi c volume roads, and to
identify promising preservation strategies for these pavements.
The two recent publications go a long way toward this goal.
The fi rst document, Preservation Approaches for High-Traffi c-
Volume Roadways, considers treatments suitable for high-level
roadways, and for perspective, also current practices for
low-volume roadways. The work presents a detailed survey of
transportation agencies and a review of national and inter-
national literature. It also provides a general framework for
how best practices are identifi ed.
General guidelines for application of preservation treat-
ments on high-volume roadways are presented in the second
document, Guidelines for Preservation of High-Traffi c-Volume Roadways,
which considers traffi c volume, pavement condition, work-
zone requirements, environmental conditions, and expected
performance.
Additional real-life examples of pavement preservation
treatments on high-traffi c roads are mapped out in a new
SHRP2 brochure that highlights the work of the 14 agen-
cies that received FHWA funds to apply treatments using the
guidelines. Approximately 13 different preservation treat-
ments are being tested on more than 30 roads with aver-
age daily traffi c ranging from 5,000 to more than 50,000
vehicles, and further tests in other states are forthcoming.
Why are preservation treatments not used as often on
high-volume versus low-volume pavements? Preservation Ap-
proaches posits:
• Agencies may associate the use of specifi c PM treatments
solely with low-volume roads, thereby assuming that they
are not appropriate for other uses, and may have concerns
over the liability and risk associated with failure (when a
treatment fails on a higher-volume roadway, more people
are affected and more people complain).
• The benefi ts of preservation on higher-traffi c-volume
roadways might not be as readily recognized or as well-
documented.
• Preservation treatments may not be as effective on
higher-traffi c-volume roadways. They may deteriorate in
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