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Extra resources for Economic Evaluation of Long-Life Pavements: Phase 1 (Road Transport and Intermodal Linkages Research Programme)
Sample text
PIARC (2000a, 2000b) have examined whole-life costing of pavements in some detail. PIARC put forward the following definition of whole-life costing used by the United States Department of Transportation: … a process for evaluating the total economic worth of a useable project by analysing initial costs and discounted future costs, such as maintenance, user, reconstruction, rehabilitation, restoring and resurfacing costs over the life of the project … The PIARC reports considered the various uses of whole-life costing techniques for a range of highway pavement-related projects.
G. above around 80 000 AADT). 1. 2). 2. 3 explores the impact if the effective life of the wearing course is 30 years instead of 40 years. 1). 3. 4 assesses the impact on viability of both a high initial cost (five times) and a 30-year life. The results indicate that long-life pavements would be uneconomical if their initial costs were five times the cost of a traditional surface but they could only achieve a 30-year life. 4. Percentage saving in NPV: 5 times cost, 15% heavy vehicles, 30 years life 40 20 0 -20 -40 -60 -80 -100 -120 -140 -160 Discount rate 3% 6% 8% 10% 40 000 60 000 80 000 100 000 Traffic (AADT) The full set of results from the runs of the PASI model which encompassed the variables discussed above can be found in Annex D.
Working hours: The available length of the daily working period determines the total time required for carrying out each surface treatment, and this, in turn, affects the costs to road users. Except where mentioned otherwise, the analysis assumed all surface treatments were scheduled to take place at night. This is now the common working method for maintenance on most high-traffic roads. The analysis was based on an eighthour working period for night work, the alternative being a ten-hour period for daytime ECONOMIC EVALUATION OF LONG-LIFE PAVEMENTS: PHASE I – ISBN-92-64-00856-X © OECD 2005 ECONOMIC FEASIBILITY OF LONG-LIFE PAVEMENT SURFACING – work.