1. Performance Measure Exploration Preparing for the 2018 RTP
INRO Model City Portland Conference
September 20, 2016

2. MAP-21 Moving Ahead for Progress in the 21st Century Act
Notice of Proposed Rulemaking
Establishes a set of performance measures for
State DOTs and MPOs to
assess the performance of the NHS
assess freight movement on the Interstate System
assess traffic congestion and on-road mobile source
emissions

3. Overview Current Metro Performance Measures Peak Spreading
New Summaries & Visualizations
Exploring Congestion Measures

4. Summary – Regional Transportation Plan
Base Year, No Build, Financially Constrained, Strategic, Climate Smart
System performance measures
Region-wide (4-county)
Metropolitan Planning Area (MPA)
Both matrix and assignment outputs

6. Comparing to Targets
Target - Triple walking, biking and transit mode shares

8. Comparing to Targets Reduce VMT per capita by 10%
Daily – Matrix-based calculation for internal trips (no trucks or externals)

9. Comparing to Targets Reduce VHD per capita by 10%
Delay based on assignments – selected time periods only

10. Comparing to Targets
Reduce VHD per truck trip by 10%

11. 2014 RTP
Comparing auto and transit travel times for pm2 and md1

15. Peak Trip Spreading Measures were produced for PM2 or MD1 time periods
PM2 oversaturated conditions
Peak spreading better captures shoulder hour impacts of excess demand
Developed process to compare Origin-Destination travel times in peak with free flow times to determine a travel time index (TTI)

16. Peak Trip Spreading
If TTI > 1.6 (most congested corridor of today), shift some of the demand between those Os & Ds to shoulders
Matrix-based spreading – assignments will still have V/Cs > 1.0 but will be more realistic
Process is carried out for entire 24 hours, creating 24 1-hour trip tables

17. Peak Trip Spreading

18. Peak Trip Spreading
Percentage of overall trips moved to shoulders is not much

19. VMT by hour

20. Congestion Thresholds
Currently using volume-to-capacity ratio-based measures, assuming level of service “E”
If V/C > .9, roadway is considered congested
Interim Mobility Policy
V/C-based, but standards differ by location, facility and time of day
FHWA is proposing a speed-based measure
35mph freeways / 15 mph arterials
Maximum throughput speed
60%-70% of free flow speed

21. VMT by hour

22. VMT by hour

23. Congested VMT

24. Congested VMT

25. Congested VMT
Comparing tables can get a bit daunting. This is looking at link-based VMT summarized by different time periods using different definitions of congestion.

26. Hours of Congestion

27. Hours of Congestion

28. Hours of Congestion

29. Hours of Congestion

30. Hours of Congestion
Peak spreading occurs, but if trips continue to be pushed into shoulders, areas will be congested for more and more hours of the day. This has huge impacts on the freight community, so we are trying to monitor that as well.

31. Daily Trucks – MPA
Path-based assignments

32. VHD on the MPA Freight Network
Extra attribute with freight network flag – add together results from the subsets of hours – tracking auto and trucks separately.

33. VHD on the MPA Freight Network

34. VHD on the MPA Freight Network

35. VHD on the MPA Freight Network

36. Summary Lots of different performance measures out there
Focus seems to be on congestion
Definition of congestion really matters
Push to move away from V/C-based measures
Don’t want to forget impact of other modes
Would appreciate seeing measures from other agencies

37. Questions? cindy.pederson@oregonmetro.gov peter.bosa@oregonmetro.gov
Questions?
Still considering best ways to convey the results – still waiting to hear outcome of Federal Rule Making.