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Transportation leadership you can trust.
presented topresented to
TRB ConferenceTRB ConferenceMeeting Federal Surface Transportation Requirements Meeting Federal Surface Transportation Requirements in Statewide and Metropolitan Transportation Planningin Statewide and Metropolitan Transportation Planning
presented bypresented byDan BeaganDan BeaganCambridge Systematics, Inc.Cambridge Systematics, Inc.Cindy Van DykeCindy Van DykeGeorgia Departement of TransportaionGeorgia Departement of TransportaionSeptember 3, 2008September 3, 2008
Georgia Department of TransportationProject Prioritization Process StudyOverview of Tools and Modeling Process
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Project Prioritization Study
Review existing GDOT process and IT systems to evaluate and prioritize projects
Review related planning partners processes and rules
Work with stakeholders to develop new process
Develop new tools to support more objective, transparent prioritization process
Tools to support GDOT in evaluation and prioritization of projects in Construction Work Program and Long Range program
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Prioritization Process
Initial focus on Roadway New Capacity projects (widenings, extensions, etc.)
Currently working to expand system to include two other project categories– Roadway Operations and Economic
Project prioritization based on clearly defined performance measures, linked to statewide goals
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Performance Measures Framework
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SWTP GoalsSWTP Goals
ProgramProgramPreservationPreservation SafetySafety
CongestionCongestion(70%)*(70%)*
Connectivity Connectivity Access and Access and
MobilityMobilityEconomic Economic
GrowthGrowthTotal Total ScoreScore
BenefitBenefit/ Cost/ Cost
Other Other FactorsFactors
Roadway Capital Roadway Capital MaintenanceMaintenanceRoadway New Capacity
1. Structural Deficiency
2. PACES Rating
3. Crash Reduction (by severity)
4. Delay Reduction
5. Travel Time:Truck Route/ IMConn./STRAHNET
6. Activity Center 7. Land Use Plan8. Access Mgmt.
9. Gross State Product
10. Economic Development Policy Area
B/C Deliverability, Funding Sources, Readiness, etc.
Roadway Traffic Operations
1. CrashReduction
(by severity)
2. Delay Reduction
3. Travel Time:Truck Route/ IMConn./STRAHNET
4. Activity Center
5. Gross StateProduct
6. Economic DevelopmentPolicy Area
B/C Deliverability, Funding Sources, Readiness, etc.
Roadway SafetyRoadway SafetyTransitTransitIntermodalIntermodalDemand Mgmt.Demand Mgmt.EconomicDevelopment
1. StructuralDeficiency
2. PACES Rating
3. Crash Reduction
(by severity)
4. Delay Reduction
5. Travel Time:Truck Route/ IMConn./STRAHNET
6. Activity Center 7. Land Use Plan8. Access Mgmt.
9. Gross StateProduct
10. Economic DevelopmentPolicy Area
B/C Deliverability, Funding Sources, Readiness, etc.
EnhancementEnhancement
* Atlanta region only.
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Performance MeasuresPreservation
Bridges – Percent structurally deficient deck area of existing bridges along project
Pavement – Percent lane miles along project with PACES rating below 70
Roadway New Capacity and Economic Development projects only
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Performance MeasuresSafety
Reduction in Crash Rates (by Crash Severity)
Roadway New Capacity, Roadway Traffic Operations, and Economic Development projects
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Performance MeasuresDelay Reduction
Roadway New Capacity and Economic Development• In Atlanta
− Recurring Delay Reduction (VHT)− Delay data from ARC travel demand model
• Outside of Atlanta − Recurring and Non-Recurring Delay Reduction (VHT)− For widening projects, Build and No-Build VHT are calculated
with equations from HERS-ST− For other capacity expansion projects, statewide model is used
Roadway Traffic Operations• Reduction in Recurring and Non-Recurring Delay (VHT)• HERS-ST
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HERS-ST
Highway Economic Requirements System – State Version (HERS-ST)
Originally, used by the FHWA to estimate highway investment needs for the U.S. in a biennial report to Congress – adopted for state use
Relies on HPMS data
Estimate performance for different funding scenarios
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HERS-ST Comparison to ARC Model
Results vary between HERS-ST and ARC model
Variance can be attributed to different modeling approaches
Different vehicle types SOV, HOV trucks, assigned differently and considered differently in delay calculations
Autos and trucks modeled separately
Vehicle types
Travel data can be extracted at link level or in “impact area”.
Only considers VHT changes on the project link
Impact Area
Recurring delay only - calibrated to observed local speed/travel time data.
Empirically fit to national observed speeds - reflects both recurring and nonrecurring delay
Congested VHT
Default capacity / lane values developed by area type and facility type.
Default capacity/lane values developed by functional class
Capacity
AM, PM, Off-Peak, Mid-DayPeak and non-peakTime of Day
User equilibrium diversion / network assignment
Not considered Diversion
ARC ModelHERS-ST Method, as Implemented for GDOT
Key Factor
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Performance MeasuresConnectivity
Change in Travel Time on a Non-Interstate Truck Route, an NHS Intermodal Connector, and/or the STRAHNET
Roadway New Capacity, Roadway Traffic Operations, Economic Development projects
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Performance MeasuresAccess and Mobility – Activity Center
Project impact to an activity center area• In Atlanta
− Centers defined by Unified Growth Policy Map
• Outside of Atlanta− Statewide activity generators were based on FHWA definition of activity centers − Updated by MPO at their request, if data provided in GIS format by requested
deadline
Roadway New Capacity, Roadway Traffic Operations, and Economic Development projects
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Performance MeasuresAccess and Mobility – Local Land Use
Is project consistent with local/regional transportation and land use plan?
Does project exceed required minimum access management standards and/or is the project subject to the requirements of a local access management plan?
Roadway New Capacity and Economic Development projects
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Performance MeasuresEconomic Impact
Change in Gross State Product• Resulting from VHT savings in 2035
• Calculated with GA HEAT equations
Roadway New Capacity, Roadway Traffic Operations, and Economic Development projects
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Weighting System
Three unique weighting systems developed• Atlanta MPO• Non-Atlanta MPO• Rural
Weights vary by level of significance for each performance measure within particular SWTP goal
Developed with extensive stakeholder input
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All Program CategoriesWeighting System – Atlanta Area
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SWTP GoalSWTP Goal Performance MeasurePerformance MeasureNew New
CapacityCapacityTraffic Traffic
OperationsOperationsEconomic Economic
DevelopmentDevelopment
PreservationBridge – SD 2.5 0.0 2.0
Pavement – PACES 2.5 0.0 2.0
Safety Crash Reduction 5.0 10.0 2.0
CongestionCongestion Delay Reduction Delay Reduction –– VHTVHT 70.070.0 70.070.0 70.070.0
Connectivity, Access and Mobility
Travel Time –– Intermodal Connector, Truck Route, STRAHNET
4.0 2.5 2.0
Activity Center 4.0 10.0 2.0
Land Use Plan 3.0 0.0 2.0
Access Management 4.0 0.0 3.0
Economic Development
Gross State Product 2.5 2.5 7.5
Economic Policy Area 2.5 5.0 7.5
Benefit/Cost 0.0 0.0 0.0
Total Weight 100.0 100.0 100.0
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Scoring System
100 point score
Delay points based on absolute delay reduction provided by project using threshold scoring approach
All other quantifiable measures scored relative to one another within each geographic area• Projects are compared relative to the best performer within each
performance measure category
• Geographic weightings are applied for each performance measure
For other qualitative measures, points assigned based on Y/N designation
Points summed across all measures to produce individual project scores
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Other Quantifiable MeasuresScoring System Example
Project ListingProject ListingCrashes Crashes ReducedReduced
Relative Relative ComparisonComparison
Assigned Assigned WeightWeight Crash PtsCrash Pts
Project 1 (Atlanta) 52 52/52 = 1.00 5 (1.00)*5 = 5.0
Project 2 (Atlanta) 25 25/52 = 0.48 5 (0.48)*5 = 2.5
Project 3 Project 3 (Atlanta)(Atlanta) 33 3/52 = 0.063/52 = 0.06 55 (0.06(0.06)*5)*5 = = 0.30.3
Project 4 (Atlanta) 13 13/52 = 0.25 5 (0.25)*5 = 1.3
Project 5 (Atlanta) 45 45/52 = 0.87 5 (0.87)*5 = 4.4
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Project Prioritization System Requirements
Prototype is web-based application
Study team still discussing best method to make this a full production system• Best way to run Prioritization system internally and
externally
GDOT IT will be maintaining final system
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Full System Run
Statewide: Three program categories
• Roadway New Capacity = 837 projects
• Roadway Traffic Operations = 47 projects
• Economic Development (GRIP) = 186 projects
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Next Steps
Public outreach – Sept / Oct 2008
• Process, not projects
Final run – Fall 2008
Final documentation and software prototype – Dec 2008
2020
Ongoing Project Prioritization Process
Considerations for future GDOT project programming:• Project score and evaluation using Prioritization Tool
• Local match – level of local funding commitment• Project origin – emphasis on projects derived from completed
local or GDOT planning studies• Environmental impacts• Financial risks• Public and political input• Project readiness and deliverability
Transportation leadership you can trust.
presented topresented to
TRB ConferenceTRB ConferenceMeeting Federal Surface Transportation Requirements Meeting Federal Surface Transportation Requirements in Statewide and Metropolitan Transportation Planningin Statewide and Metropolitan Transportation Planning
presented bypresented byDan BeaganDan BeaganCambridge Systematics, Inc.Cambridge Systematics, Inc.Cindy Van DykeCindy Van DykeGeorgia Departement of TransportaionGeorgia Departement of Transportaion
September 3, 2008September 3, 2008
Georgia Department of TransportationProject Prioritization Process StudyOverview of Tools and Modeling Process
