HDM-4 Applications. HDM-4 Applications. Project Appraisal Project Formulation Maintenance Policy Optimization Road Works Programming Network Strategic Analysis Standards & Policies. Project Appraisal. Project types New construction, upgrading Reconstruction, resealing
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Concerned with the economic justification of a project defined by other means.
Current Policy (Without Project)
- Gravel resurfacing when thickness of gravel is less than 50mm
- Routine maintenance
- Grading every 182 days
Gravel Road with300 AADT
Proposed Project (With Project)
- Upgrade the road to a paved standard
- After upgrading, routine maintenance, patching 100% of the potholes, and resealing when damaged area > 20%
Two Project Alternatives
---- Present Values ---------------- Internal Construction & Road Net Rate ofLength Maintenance User Total Present Return(km) Alt. Costs Costs Costs Value (%)
10.0 Without 0.18 5.10 5.28 With 1.75 3.10 4.85 0.43 15.5
Is the project economically justified?
Concerned with the economic comparison of project alternatives to better define the project.
- Regravel and grading every 182 days
- Upgrade in 2006
- Upgrade in 2007
Gravel Road with300 AADT
- Upgrade in 2008
- Upgrade in 2009
Many Project Alternatives
Which is the optimal alternative?
Concerned with finding an optimal maintenance policy and funding for a given road class.
- Reconstruction when roughness > 8.0 IRI
- 25 mm reseal when damaged area > 10%
- 25 mm reseal when damaged area > 20%
- 25 mm reseal when damaged area > 30%
- 40 mm overlay when roughness > 3.0 IRI
A Paved Roadin Fair Condition
- 40 mm overlay when roughness > 4.0 IRI
- 40 mm overlay when roughness > 5.0 IRI
- 80 mm overlay when roughness > 3.0 IRI
- 80 mm overlay when roughness > 4.0 IRI
- 80 mm overlay when roughness > 5.0 IRI
- All include routine maintenance and patching 100% of potholes
Which is the optimal maintenance policy?
Concerned with the preparation of single or multi-year road work and expenditure programmes under specified budget constraints.
Good Condition Roads- Reseal 25 mm in 2006- Reseal 25 mm in 2007- Reseal 25 mm in 2008- Reseal 25 mm in 2009
Homogeneous Road Sections
Concerned with the analysis of
entire road networks to determine funding needs and/or
to predict future performance under budget constraints
Matrix of Road Classes
Optimal Program underBudgetary Constraints
Maintenance Budget ($m)
Concerned with specific studies designed to define rational technical standards and vehicle policies
What is the optimal traffic threshold for paving?
How much road damage is caused by trucks?