JUSTIFY

1. JUSTIFY

2. Methodology for Measuring NaviGAtor ITS Performance ITS Georgia Annual Meeting 2010 Presented By: Prasoon Sinha, P.E, PTOE Department Manager, ARCADIS

3. Outline Presentation Goals • Deficiencies in current practices • Approach to estimating benefits of NaviGAtor/ITS • Approach to estimating secondary crashes and ITS impact parameters • How can we perform better? • Summary

4. Current Practices • Do not segregate the benefits of ITS and geometric operational/safety improvements Absence of traceability between problems and solutions • Use national values of “ITS impact parameters” which may not be applicable to all areas Analysis results do not reflect accurate benefits • Do not identify the deficiencies in the existing ITS and roadway infrastructure to answer the question “How can we perform better?”

5. Methodology Benefits = Performance Without ITS - Performance WithITS Three main ingredients to themethodology: • Traceability between various incident types and applicable countermeasures/solutions • Approach to estimation of secondary crashes • Approach to estimation of area-specific “Without ITS Conditions” / “ITS Impact Parameters”

6. Traceability Between Problems and Solutions Trigger Event Tied to and Addressed by ITS Deployments Fatalities Cost of Severity Severities Injuries Secondary Crashes • Bad Weather • Debris • Stalled Vehicle • Work Zones • Special Events • Primary Crashes PDO Delay Value of Time Queues Emission Queuing Eqn. Throughput Delay Value of Time Queues Emission Queuing Eqn. Throughput Tied to and Addressed by Operational and Safety Improv. Fatalities Cost of Severity Severities (Fatalities, Injuries, PDO) Due to Primary Crashes Injuries PDO Recurring Congestion • Demand • > • Capacity Delay Value of Time Queues Emission Queuing Eqn. Throughput

7. Form Data Groups & Estimate Secondary Crashes Area of Influence (spatial & temporal coordinate) Categorize current crash data by trigger events Estimate queues due to all trigger events (using queuing theory equations) Estimate secondary crashes resulting from all trigger events Estimate severities due to primary crashes Perform travel time comparisons (under “No trigger event” condition) to quantify recurring congestion

8. Data Availability and ITS Impact Parameters With Without • Corridors having “Without ITS” and “With ITS” data • I-285 West wall (between I-75 and I-20) • SR 400 between I-285 and Old Milton Pkwy • I-85, South of Camp Creek Pkwy • Control group corridors (currently No ITS) • I-20 east of Panola Road NaviGAtor/ITS Operational & Safety Improv. Need to estimate “Without NaviGAtor/ITS” conditions data -> Estimate Impact Parameters Define control corridors

9. ITS Driven Congestion Benefits - All Trigger Events Total Congestion Benefits ($) Time Value of Money ($$$) Incident Clearance Time MAX QUEUE LENGTH CARS DELAY FOR DURATION OF INCIDENT Fuel Consumption($) TRANSIT TRUCKS Delay Savings ($) QUEUE CLEARANCE TIME QUEUE CLEARANCE TIME DELAY COMPONENTS Reduced Emission ($) DELAY DURING CLEARANCE TIME TOTAL DELAY (DT) DT = Di + Dg Delay By Travel Mode V- Average Volume on the freeway C- Freeway Capacity at LOS E r- Capacity Reduction Factor g- Average flow rate during queue clearance time Congestion Before = Delay DT(Before) + Emission (Before) + Fuel Consumption (Before) Congestion After = Delay DT(After) + Emission (After) + Fuel Consumption (After) Congestion Benefit (CB-ITS)= Congestion Before - Congestion After

10. Benefit of ITS & Proportion of ITS Benefits Benefits ITS Total = Congestion Benefit (CB-ITS) + Safety Benefit (SB-ITS) Benefits Ops Total = Congestion Benefit (CB-Ops)+ Safety Benefit (SB-Ops) BenefitsTotal = Congestion Benefit (CB-ITS) + Congestion Benefit (CB-Ops)+ Safety Benefit (SB-ITS) + Safety Benefit (SB-Ops)

11. How Can We Perform Better? Categorize incident data by Trigger Events (GIS database, thematic maps) Conduct Hot-Spot Analysis Query to identify highest secondary crash locations (ITS) or high primary crashes (operational or safety improvements) Identify existing NaviGAtor coverage at Hot-Spot locations Identify the gaps in deployment and match it with problem type Fill the gaps in deployment Deploy ITS that can address primary crashes & recurring congestion

12. In Summary….. A robust methodology that: • Resides on a GIS platform which ties perfectly into the NaviGAtor dashboard • Provides B/C ratios by corridors and by overall system • Provides equations for estimation of secondary crashes and calculations of ITS benefits and costs • Provides approach to estimating region specific ITS impacts • Categorizes the share of non-recurring congestion by incident type • Provides ratio of ITS Benefits to Overall Benefits • Identifies existing system deficiencies, recommends potential countermeasures and expected benefits Provides Funding Justification for ITS

13. Thank You! QUESTIONS? Contact Information: Prasoon Sinha, PE, PTOE ARCADISprasoon.sinha@arcadis-us.com (770)384-6604