The pavement design committee adopted GDOT's first LCCA guidelines in 1994 (see GDOT Guidelines for Life-Cycle Cost Analysis), incorporating user costs into the equation. Then Georgia and eight other States took part in FHWA's Demonstration Project 115, Life-Cycle Cost Analysis in Pavement Design, attending a two-day workshop on applying LCCA principles and incorporating information from the interim technical bulletin (1) by the same name.
Pavement management duties were spread throughout the department. GDOT worked to address this by forming the Pavement Management Branch in September 2001. The department's goal was to centralize the management of pavements by bringing all pavement management functions together and by applying effective transportation asset management practices to pavements.
GDOT Guidelines for Life-Cycle Cost Analysis
Adopted in 1994
Like other DOTs, Georgia wanted to facilitate consistency throughout the agency and expand its transportation asset management program, including LCCA. Specifically, GDOT wished to compare multiple alternatives for a project and evaluate the relative economic merit of each option by analyzing initial and discounted future expenditures for rehabilitation and preservation activities.
Toward that end, in 2002 GDOT staff participated in FHWA training for the agency's RealCost software, a Microsoft Excel-based LCCA spreadsheet program that States can utilize at no charge. During efforts to use RealCost, GDOT staff encountered a challenge: RealCost could compare only two project alternatives at a time, and GDOT wished to compare up to 10 alternatives or more simultaneously.
Because of the numerous alternatives and options available to achieve the objectives of the I-85 project mentioned in the Executive Summary, GDOT Pavement Test Engineer James Turner developed a series of customized spreadsheets to apply the LCCA methodology outlined in the FHWA Life-Cycle Cost Analysis in Pavement Design Technical Bulletin. Turner also incorporated a weighted decision methodology based on guidance in the 1993 American Association of State Highway Transportation Officials (AASHTO) Guide for Design of Pavement Structures. The customized spreadsheets use cost data from databases maintained in the Engineering Services Division by the GDOT Estimator.
Figure 3: Wildflowers along I-75 in Bartow County.
1. The Life-Cycle Cost Analysis in Pavement Design Technical Bulletin is available online at http://isddc.dot.gov/OLPFiles/FHWA/013017.pdf. (.pdf, 1.4 mb)