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Published byDwain Paul Modified over 9 years ago
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8 th Road Pavements Forum 17 Nov 2004 SABITA PROJECT: Warrants for upgrading SuperSurf J Lea and P Paige-Green
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BACKGROUND T ransportek has made use of a simple spreadsheet for assessing the economics of upgrading for some time Sabita requested us to improve and formalise it To include various other components Sort of “grandson” of SURF +
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WHAT IS SUPERSURF? Does detailed economic analyses of various strategies for upgrading unsealed roads Tool to assist in making decisions regarding upgrading Economic justification for these decisions Formalised structure
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WHAT IS SUPERSURF NOT? Not a forecasting tool Does not identify options Is not a substitute for HDM4 or CB Roads
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STRUCTURE Setup of standard inputs (discount rate, analysis period, etc) Standard base case – existing gravel road Various options for upgrading Stage construction Dust palliative Bituminous surfacing
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PROCESS l Determine financial and economic costs of base case – maintenance, rehabilitation, VOC, accident, social and environmental l Can make use of shadow costs for maintenance and rehabilitation inputs l Add options – same inputs –Defaults built in – better to use actual
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INNOVATIONS l Vehicle operating costs – DBSA models and average inflation rate l Shadow cost facility for construction, maintenance and rehabilitation l Environmental costs l Social benefits l Paved road performance
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SHADOW COSTS l Default in road user costs l Optional in construction, maintenance & rehab costs
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SHADOW COSTS
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ENVIRONMENTAL COSTS l Can “estimate” costs for different options related to various operations/activities
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SOCIAL BENEFITS l Similar to environmental costs
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PAVED ROAD STRATEGIES l Simple exponential deterioration model l Similar to those in most PMS’s, but based entirely on roughness
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OUTPUT l Pseudo agency and economic costs l Internal Rate of Return of various options compared with base (existing) case
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