Assessment of alternatives in vegetation management at the edge of pavement.
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2010-05-01
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Edition:Final research report.
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Abstract:WSDOT has historically maintained a bare ground strip (formerly referred to as Zone 1) along
most state highway pavement edges with the use of non-selective herbicides. However, many
other state DOTs and county road maintenance organizations do not maintain a bare-ground strip
on all road shoulders. WSDOT solicited the assistance of the University of Washington in
conducting a preliminary study on what other state and county departments of transportation were
doing and experiencing in managing vegetation at the edge of pavement. Initial study concluded
that there were a variety of methods being applied in management of vegetation at the pavement
edge, but very little documented data on costs and results.
This report is a follow-up to the 2005 UW study, documenting the costs, outcomes and
recommendations resulting from 43 individual case studies on Washington State highways
between the years of 2006 and 2009. Alternative approaches are grouped into five categories:
Managed Vegetation up to the Edge of Pavement, Pavement Edge Design, Cultivation, Weed
Barriers, and Non-Selective Herbicides. The first two categories are focused on a vegetated
treatment at pavement edge, while the last three describe various methods of providing a nonvegetated
pavement edge. Both of these conditions are now referred to as a Zone 1 treatment.
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