RoadScience
10 November 2014 Better Roads
customer satisfaction at a less expensive cost than conven-
tional noise walls. In addition, the LOS wall policy could
include the option to require a portion of the cost to be
provided from private funds."
In a predecessor (2013) report by the Joint Transporta-
tion Research Program of the Indiana DOT and Purdue
University, Evaluation of Alternatives to Sound
Barrier Walls, the same authors elaborate on
the LOS wall concept.
In general, LOS walls are smaller, and
therefore cheaper, than conventional noise
walls, they say. As LOS walls are smaller,
and may have no surface treatment with
absorptive materials, they may not provide
noise reduction of at least 5 dBA that can
commonly be achieved by conventional
noise walls.
"There are some unique [issues] with
the construction of LOS walls," they say.
"First, LOS walls provide an alternative to
meet the expectation of our communities
to some degree at a much less expensive cost. More areas
may be justifi ed for noise abatement measures.
"Second, LOS walls provide a channel to utilize private
funds for those projects that do not meet the classifi cation
of a Type I projects or those locations where the cost-effec-
tiveness criteria cannot be met," they write. "Third, unlike
Precast panels permit aesthetic design; relief helps attenuate noise
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Tom
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