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HDM-4 Inputs and Options
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Speed (km/hr)
S1
S2
S3
Sult
Qo Qnom Qult
Flowveh/hr
Speed Flow Type
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PeakNext to Peak
Flow Periods
Medium flowNext to LowOvernight
Flow
Number of Hours in the Year
Traffic Flow Pattern
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Vertical Profile
Horizontal Profile
Rise Plus Fall = (R1+R2+R3+F1+F2) / Length(meters/km)
Horizontal Curvature = (C1+C2+C3+C4) / Length(degrees/km)
Rise Plus Fall & Horizontal Curvature
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• Analysis by Section: Section alternatives are defined for each section. The analysis determines the optimum alternative for each section. NPV is calculated for each section alternative. Analysis by Sections supports neither new sections nor diverted traffic.
• Analysis by Project: A project is composed of many sections. Project alternatives are defined indicating a maintenance/improvement standard per section. NPV is calculated for each project alternative (i.e. for the group of sections). The analysis determines the optimum alternative for the sections as a group. Analysis by Project supports the analysis of new sections and diverted traffic.
Analysis by Sections or Project
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Each section is evaluated individually and can have any number of alternatives. HDM-4 produces a NPV for each section alternative that is used to find the optimal alternative per section.
Road Definition of Section AlternativesSections 1 (base) 2 3 4 5Section A Routine ResealingSection B Routine Resealing OverlaySection C Routine Overlay Reconstruction WideningSection D Routine Resealing Overlay Widening RealignmentSection E Grading Regravelling Paving
Road Section Alternatives Results Project Alternatives ResultsSections 1 2 3 4 5Section A 0 NPV A2
Section B 0 NPV B2 NPV B3
Section C 0 NPV C2 NPV C3 NPV C4
Section D 0 NPV D2 NPV D3 NPV D4 NPV D5
Section E 0 NPV E2 NPV E3
Analysis by Sections Example
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Analyses road sections together as a package by considering project alternatives as the unit for performing economic analysis. HDM-4 produces a NPV for each project alternative.
Road Definition of Project AlternativesSections 1 (base) 2 3 4Section A Routine Resealing Overlay ReconstructionSection B Routine Resealing Overlay ReconstructionSection C Routine Overlay Reconstruction WideningSection D Routine Overlay Widening RealignmentSection E Grading Regravelling Paving Widening
Project Alternatives Results Project Alternatives Results1 2 3 4
Project 0 NPV 2 NPV 3 NPV 4
Analysis by Project Example 1
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Analysis involving new sections and diverted traffic can only be performed using the Analysis by Project method.
Road Definition of Project AlternativesSections 1 2 3Section A Routine Resealing ResealingSection B Routine Resealing ResealingSection C Routine Resealing ResealingSection D Routine Resealing ResealingNew Section Bypass X Bypass Y
Project Alternatives Results1 2 3
Project 0 NPV 2 NPV 3
Analysis by Project Example 2
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Evaluates
Many Budget Use Create
Roads Users Generates Type of Constraints Existing New
HDM-4 or Road Specify Unconstrained Economic Network Road Network
Option Classes Standards Program Analysis Optimization Network Matrix
Projects Yes - by Section No - Life-cycle None Yes No
- by Project
Programmes Yes - by Section Yes - Life-cycle - Maximize NPV Yes No
- Multi-year
Forward
Programme
Strategies Yes - by Section Yes - Life-cycle - Maximize NPV Yes Yes
- Maximize dIRI
- Minimize costs
for target IRI
Project, Programs & Strategies
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IRI Budget Period
Deferred investment
Investment now Benefits from Investment
Years
Budget period: for example 1, 2 or 3 years
Multi-year Forward Programme Evaluation
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• HDM-4 Case Studies Included with HDM-4Documented on Volume 2:
Application Guide
C:\Program Files\HDM-4\Case Studies\Eng
• World Bank Case StudiesProvided by the World Bank
C:\HDM-4 Version 2.0 WB Case Studies 1.0
Windows FoldersContaining HDM-4
Workspace
HDM-4 Version 2.0 Case Studies
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•Contains the configuration and inputs of an HDM-4 study
•Can be copied from one computer to another
•Composed of two files:
OBJECTS.DATOBJECTS.IDX
HDM-4 Workspace
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•Obtain the HDM-4 workspace (OBJECTS.DAT and OBJECTS.IDX files) created for the study
•Copy the HDM-4 workspace files into any folder on your computer
•Run HDM-4 and open the workspace, using the Open Workspace option and then locating the folder in which you have copied the workspace files
•Open the HDM-4 study
To Review an HDM-4 Study
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InputData
Application OptionsData
ConfigurationData
HDM-4 Version 2.0 Structure
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HDM-4 Folders
- HDM-4 folders resemble Windows Explorer folders, but these are not actual Windows folders, they are
components of the HDM-4 Workspace.
- An HDM-4 Workspace is a Database that contains allinput, application options and configuration data
for a given study.
HDM-4 Folders
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Windows folder where HDM-4 Workspace is located
- There could be many HDM-4 Workspaces on a hard disk, which are located on different Windows folders.
- An HDM-4 Workspace Database is composed of thefollowing files: OBJECTS.DAT and OBJECTS.IDX, which
can be copied from one Windows folder to another.
HDM-4 Workspace
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- The Run Data Export Directory is the Windows folder that will store all the output files created by HDM-4 for an HDM-4 run.
HDM-4 Run Data Directory
HDM-4 Run Data Directory on Setup Run
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HDM-4 Output File
• HDM-4 stores all the output results of an HDM-4 run on a single Access file named “RunData.mdb” located at the Run Data Export Directory.
• Users can explore the output results of an HDM-4 Run by importing the output data stored on the RunData.mdb file into Excel or a Pavement Management System.
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You can export or import each item of
information to or from an Access file.
Access files are used to connect HDM-4 with a Pavement Management
System or Excel.
Import or Export to Access Files
Export and Import Options
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Road Network Export File Format.pdfVehicle Fleet Export File Format.pdf
located on C:\Program Files\HDM-4 Version 2.0\Documentation\Eng
Export and Import File Formats
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Road Network Import Sample File
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