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Guide for Pavement-Type Selection (2011) / Chapter Skim
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Pages 20-26

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From page 20...
... Frequent interventions also may result in higher work zone user costs and impacts on local business and community. The evaluation should determine if an alternative that requires frequent rehabilitation actions may be suitable for the project.
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From page 21...
... More information on user costs may become available from FHWA, NCHRP, and state departments of transportation (DOTs) research efforts.
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From page 22...
... Where alternate pavement designs have comparable initial costs, including the attendant costs of earthwork, drainage facilities, and other appurtenances, and provide comparable service-life or life-cycle cost, the highway agency may elect to take alternate bids to stimulate competition and obtain lower prices. • Noise issues.
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From page 23...
... Grouping structure of the alternativepreference screening matrix. elpmaxEnoisreVlareneG Group A Factor A1 Factor A2 … Factor An Economic factors Initial costs Future rehabilitation costs … User costs Group B Factor B1 Factor B2 … Factor Bn Construction factors Continuity of adjacent lanes Traffic during construction … Lane geometrics Group C Factor C1 Factor C2 … Factor Cn Local factors Availability of local materials District/local preferences … Stimulation of competition Group D Factor D1 Factor D2 … Factor Dn Other factors Noise Subgrade soils ...
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From page 24...
... Factor Low Medium High Initial costs Cost >10% Cost >5% and <10% Cost within 5% Life-cycle costs Cost >20% Cost >10% and <20% Cost within 10% User costs User cost >20% User cost >10% and <20% User cost within 10% Future rehabilitation costs Cost >10% Cost >5% and <10% Cost within 5% Future maintenance costs Cost >10% Cost >5% and <10% Cost within 5% Roadway/lane geometrics Significant complexity to accommodate Moderate complexity to accommodate Easy to accommodate Continuity of adjacent pavements Significant issues Some significant issues possible No significant issues Continuity of adjacent lanes Significant issues Some significant issues possible No significant issues Availability of local materials and experience Lack of local experience Some experience Commonly used Traffic during construction Very difficult to accommodate Somewhat difficult to accommodate Easy to accommodate Noise Much higher noise likely Some increased noise possible No difference in noise generated Subgrade soils Significant issues for construction Some issues possible for construction No significant issues for construction District/local preference No preference Some preference Significant preference Safety considerations Significant issues related to safety features Some issues related to safety features Better safety features Conservation of materials/energy Much higher materials/ energy use Somewhat higher materials/energy use No significant difference Stimulation of competition Very few capable contractors Some experience Common experience for each Maintenance capability Little to no local experience Some experience Common experience for each Future needs Very difficult to accommodate Somewhat difficult to accommodate Easy to accommodate Experimental features Common technology National but no local experience New and unproven technology Preference Rating Numerical Score No difference 0% Low 20% Medium low 40% Medium 60% Medium high 80% High 100%
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From page 25...
... Economic Factors Individual Factor Weight Preference Rating Numerical Rating Weighted Score Initial costs 30% Medium 60% 18.0% Future rehab costs 25% High 100% 25.0% User costs 20% Low 20% 4.0% Future maintenance costs 25% Mediumlow 40% 10.0% Total unweighted score for Economic Factors %75 Group Group Weight Unweighted Group Score Weighted Group Score Economic factors 50% 57% 28.5% Construction factors 25% 45% 11.3% Local factors 10% 25% 2.5% Other factors 15% 15% 2.3% %6.44xirtamehtfoerocslatoT
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From page 26...
... RDN-Alt1 RDN-Alt2 WDn* RDN-Alt2 Group D unweighted total 100% Σ(WDi*
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Key Terms

  • user costs
  • numerical rating
  • unweighted total
  • safety considerations
  • rehabilitation costs

  • initial costs
  • noneconomic factors
  • maintenance costs
  • future rehabilitation
  • work zone

  • evaluation factors
  • significant issues
  • factor weights
  • noise mitigation
  • weighted total

  • cycle costs
  • experimental features
  • future maintenance
  • pavement types
  • subgrade soils

  • state departments
  • costs cost
  • user cost
  • common experience
  • screening matrix

  • pavement type
  • unweighted score
  • local factors
  • matrix worksheet
  • experience common


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