Intersection life cycle cost comparison tool user guide version 1.0.
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2016-05-01
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Alternative Title:Evaluation of life cycle impacts of intersection control type selection.
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Abstract:The Intersection Life Cycle Cost Comparison Tool User Guide was developed as part of North
Carolina Department of Transportation Research Project No. 2014‐11: Evaluation of Life Cycle
Impacts of Intersection Control Type Selection.
This spreadsheet‐based computational engine is designed to analyze the long‐term costs and
benefits of NCDOT conversions of two‐way stop controlled intersections to other intersection
types. It is designed to be used during the planning phase of potential intersection conversion
projects to help stakeholders identify the most cost‐effective conversion configuration option.
This user‐friendly tool combines enhanced 2010 Highway Capacity Manual methodologies and
standard cost benefit analysis methodologies to calculate the long‐term net benefits of
converting a two‐way stop controlled intersections to three different alternatives: 1) all‐way
stop controlled, 2) signalized, and 3) roundabout types. For the purpose of tool, a two‐way stop
controlled (TWSC) intersection is defined as a four‐way intersection with no control mechanism
for the main approach and stop signs positioned at the minor approach.
Based on user inputs and standard state and national data, site‐specific construction and
maintenance, user delay, and safety costs and benefits are calculated for each of the three
conversion types. These costs and benefits are projected into the future using a methodology
that considers the changing value of money over time. The resulting dollar figures can be
compared to identify the intersection type that offers the greatest return on investment to
North Carolina citizens over a user‐specified time period.
Much of the material in this manual is in the accompanying instructional video at
http://go.ncsu.edu/lcca_video.
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