As transportation funding becomes increasingly constrained, it is imperative that
decision makers invest precious resources wisely and effectively. Transportation
planners need effective tools for anticipating outcomes (or ranges of outcomes) in order
to select preferred project alternatives and evaluate funding options for competing
projects.
To this end, this thesis work describes multiple applications of a new Project
Evaluation Toolkit (PET) for highway project assessment. The PET itself was developed
over a two-year period by the thesis author, in conjunction with Dr. Kara Kockelman, Dr.
Chi Xie, and some support by others, as described in Kockelman et al. (2010) and the
PET Users Guidebook (Fagnant et al. 2011). Using just link-level traffic counts (and
other parameter values, if users wish to change defaults), PET quickly estimates how
transportation network changes impact traveler welfare (consisting of travel times and
operating costs), travel time reliability, crashes, and emissions. Summary measures (such
as net present values and benefit-cost ratios) are developed over multi-year/long-term
horizons to quantify the relative merit of project scenarios.
This thesis emphasizes three key topics: a background and description of PET,
case study evaluations using PET, and sensitivity analysis (under uncertain inputs) using
PET. The first section includes a discussion of PET’s purpose, operation and theoretical
behavior, much of which is taken from Fagnant et al. (2010). The second section offers
case studies on capacity expansion, road pricing, demand management, shoulder lane use,
speed harmonization, incident management and work zone timing along key links in the
Austin, Texas network. The final section conducts extensive sensitivity testing of results
for two competing upgrade scenarios (one tolled, the other not); the work examines how
input variations impact PET outputs over hundreds of model applications.
Taken together, these investigations highlight PET’s capabilities while identifying
potential shortcomings. Such findings allow transportation planners to better appreciate
the impacts that various projects can have on the traveling public, how project evaluation
may best be tackled, and how they may use PET to anticipate impacts of projects they
may be considering, before embarking on more detailed analyses and finalizing
investment decisions. / text
| Identifer | oai:union.ndltd.org:UTEXAS/oai:repositories.lib.utexas.edu:2152/ETD-UT-2011-08-3923 |
| Date | 29 September 2011 |
| Creators | Fagnant, Daniel James |
| Source Sets | University of Texas |
| Language | English |
| Detected Language | English |
| Type | thesis |
| Format | application/pdf |
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