SHRP 2 L08: Incorporation of Travel Time Reliability into the...
Transcript of SHRP 2 L08: Incorporation of Travel Time Reliability into the...
![Page 1: SHRP 2 L08: Incorporation of Travel Time Reliability into the …onlinepubs.trb.org/onlinepubs/shrp2/RFPL38/L08presentation.pdf · SHRP 2 Project L08: Incorporation of Travel Time](https://reader031.fdocuments.net/reader031/viewer/2022040400/5e710f83d14576256e61a08b/html5/thumbnails/1.jpg)
SHRP 2 Project L08: Incorporation of Travel Time Reliability into the Highway Capacity Manual
1
L38 Discussion - August 1, 2012
![Page 2: SHRP 2 L08: Incorporation of Travel Time Reliability into the …onlinepubs.trb.org/onlinepubs/shrp2/RFPL38/L08presentation.pdf · SHRP 2 Project L08: Incorporation of Travel Time](https://reader031.fdocuments.net/reader031/viewer/2022040400/5e710f83d14576256e61a08b/html5/thumbnails/2.jpg)
Research ObjectivesResearch Objectives
(1) Determine how non-recurrent congestion impacts can be incorporated into HCM procedures
(2) Develop methodologies to predict travel time reliability on freeway and urban street facilities
(3) Prepare draft material (Reliability Guide) for possible future incorporation into the HCM
The objectives of Project L08 are to:
2
![Page 3: SHRP 2 L08: Incorporation of Travel Time Reliability into the …onlinepubs.trb.org/onlinepubs/shrp2/RFPL38/L08presentation.pdf · SHRP 2 Project L08: Incorporation of Travel Time](https://reader031.fdocuments.net/reader031/viewer/2022040400/5e710f83d14576256e61a08b/html5/thumbnails/3.jpg)
Anticipated ProductsAnticipated Products
• Computational procedures (and computational engines) for assessing travel time reliability– Freeway facilities– Urban streets
• Reliability Guidebook
• Draft chapters for possible inclusion in the HCM
3
![Page 4: SHRP 2 L08: Incorporation of Travel Time Reliability into the …onlinepubs.trb.org/onlinepubs/shrp2/RFPL38/L08presentation.pdf · SHRP 2 Project L08: Incorporation of Travel Time](https://reader031.fdocuments.net/reader031/viewer/2022040400/5e710f83d14576256e61a08b/html5/thumbnails/4.jpg)
Guidebook OutlineGuidebook Outline
• Introduction– Purpose, importance, chapter organization– Definitions and concepts– Overview of the methodology
• Concepts– Objectives for Reliability Analysis– Measures of Effectiveness– Reliability Values for Major Metropolitan Areas– Data Acquisition Challenges– Interpretation of Results
4
![Page 5: SHRP 2 L08: Incorporation of Travel Time Reliability into the …onlinepubs.trb.org/onlinepubs/shrp2/RFPL38/L08presentation.pdf · SHRP 2 Project L08: Incorporation of Travel Time](https://reader031.fdocuments.net/reader031/viewer/2022040400/5e710f83d14576256e61a08b/html5/thumbnails/5.jpg)
Guidebook Outline (part 2)Guidebook Outline (part 2)
• Methodology (overview of theoretical framework)
– Freeways – Urban Streets– Corridors
• Application (detailed description of computational steps)
– Freeways – Urban Streets– Corridors
• Use Cases– Freeway, Urban Street, Corridor
• References
5
![Page 6: SHRP 2 L08: Incorporation of Travel Time Reliability into the …onlinepubs.trb.org/onlinepubs/shrp2/RFPL38/L08presentation.pdf · SHRP 2 Project L08: Incorporation of Travel Time](https://reader031.fdocuments.net/reader031/viewer/2022040400/5e710f83d14576256e61a08b/html5/thumbnails/6.jpg)
Appendices to GuidebookAppendices to Guidebook
• Scenario Generation• Recurring Demand Variability• Weather Effects• Incident Effects• Work Zone Effects• Special Event Effects• Computational Engine Documentation• Additional Example Problems• References
6
![Page 7: SHRP 2 L08: Incorporation of Travel Time Reliability into the …onlinepubs.trb.org/onlinepubs/shrp2/RFPL38/L08presentation.pdf · SHRP 2 Project L08: Incorporation of Travel Time](https://reader031.fdocuments.net/reader031/viewer/2022040400/5e710f83d14576256e61a08b/html5/thumbnails/7.jpg)
Definitions and ConceptsDefinitions and Concepts
StudyPeriod
Study Section
66 66 69 70 63 66 66 6666 68 68 65 69 63 63 6368 66 60 67 63 39 64 6464 70 70 65 38 39 67 6762 64 68 40 18 37 69 6964 70 37 14 14 40 65 6569 39 25 21 16 37 69 6966 65 38 13 11 37 70 7068 63 62 40 18 38 67 6763 63 62 68 40 37 68 6864 61 65 62 61 39 61 6163 63 60 65 67 63 63 6365 70 64 63 67 64 64 64
66 66 69 70 63 66 66 6666 68 68 65 69 63 63 6368 66 60 67 63 39 64 6464 70 70 65 38 39 67 6762 64 68 40 18 37 69 6964 70 37 14 14 40 65 6569 39 25 21 16 37 69 6966 65 38 13 11 37 70 7068 63 62 40 18 38 67 6763 63 62 68 40 37 68 6864 61 65 62 61 39 61 6163 63 60 65 67 63 63 6365 70 64 63 67 64 64 64
66 66 69 70 63 66 66 6666 68 68 65 69 63 63 6368 66 60 67 63 39 64 6464 70 70 65 38 39 67 6762 64 68 40 18 37 69 6964 70 37 14 14 40 65 6569 39 25 21 16 37 69 6966 65 38 13 11 37 70 7068 63 62 40 18 38 67 6763 63 62 68 40 37 68 6864 61 65 62 61 39 61 6163 63 60 65 67 63 63 6365 70 64 63 67 64 64 64
66 66 69 70 63 66 66 6666 68 68 65 69 63 63 6368 66 60 67 63 39 64 6464 70 70 65 38 39 67 6762 64 68 40 18 37 69 6964 70 37 14 14 40 65 6569 39 25 21 16 37 69 6966 65 38 13 11 37 70 7068 63 62 40 18 38 67 6763 63 62 68 40 37 68 6864 61 65 62 61 39 61 6163 63 60 65 67 63 63 6365 70 64 63 67 64 64 64
66 66 69 70 63 66 66 6666 68 68 65 69 63 63 6368 66 60 67 63 39 64 6464 70 70 65 38 39 67 6762 64 68 40 18 37 69 6964 70 37 14 14 40 65 6569 39 25 21 16 37 69 6966 65 38 13 11 37 70 7068 63 62 40 18 38 67 6763 63 62 68 40 37 68 6864 61 65 62 61 39 61 6163 63 60 65 67 63 63 6365 70 64 63 67 64 64 6415:00
18:00
Each cell is one analysis period of an analysis segment.
TemporalDimension
SpatialDimension
Reliability Reporting Period
7
![Page 8: SHRP 2 L08: Incorporation of Travel Time Reliability into the …onlinepubs.trb.org/onlinepubs/shrp2/RFPL38/L08presentation.pdf · SHRP 2 Project L08: Incorporation of Travel Time](https://reader031.fdocuments.net/reader031/viewer/2022040400/5e710f83d14576256e61a08b/html5/thumbnails/8.jpg)
FrameworkFramework
• Flow Chart
8
![Page 9: SHRP 2 L08: Incorporation of Travel Time Reliability into the …onlinepubs.trb.org/onlinepubs/shrp2/RFPL38/L08presentation.pdf · SHRP 2 Project L08: Incorporation of Travel Time](https://reader031.fdocuments.net/reader031/viewer/2022040400/5e710f83d14576256e61a08b/html5/thumbnails/9.jpg)
Use Cases for SHRP2-L08/HCMUse Cases for SHRP2-L08/HCM
1. Assess existing reliability of facilities. √2. Predict future reliability of facilities. √3. Identify options to improve reliability.4. Estimate benefits of improvements. √5. Prioritize reliability improvement options.6. Set local standards for acceptable reliability. √7. Improve demand modeling.
9
![Page 10: SHRP 2 L08: Incorporation of Travel Time Reliability into the …onlinepubs.trb.org/onlinepubs/shrp2/RFPL38/L08presentation.pdf · SHRP 2 Project L08: Incorporation of Travel Time](https://reader031.fdocuments.net/reader031/viewer/2022040400/5e710f83d14576256e61a08b/html5/thumbnails/10.jpg)
Example Urban Street applicationsExample Urban Street applications
• Alternatives Analysis– Compare base condition to alternative condition
• Analysis Scenarios– Work zones and special events
• Alternative start dates and durations• Alternative lane closures and signal timing strategies
– Weather• Examine operational effects of strategies that reduce weather-
related crashes or crash severity (i.e., snow removal, resurfacing)– Incidents
• Examine operational effects of strategies that reduce incident duration
• Evaluate benefit of providing shoulder for stalled vehicle refuge– Design or Operation
• Evaluate alternative signal timing plans• Evaluate alternative intersection lane allocations or segment
geometry
10
![Page 11: SHRP 2 L08: Incorporation of Travel Time Reliability into the …onlinepubs.trb.org/onlinepubs/shrp2/RFPL38/L08presentation.pdf · SHRP 2 Project L08: Incorporation of Travel Time](https://reader031.fdocuments.net/reader031/viewer/2022040400/5e710f83d14576256e61a08b/html5/thumbnails/11.jpg)
Combined Operation and Safety EvaluationCombined Operation and Safety Evaluation
• Consideration of Operations and Safety– Effect of design and control choices can be quantified
• Effect on operational performance• Effect on safety performance
– HSM makes combined, quantitative assessment possible
![Page 12: SHRP 2 L08: Incorporation of Travel Time Reliability into the …onlinepubs.trb.org/onlinepubs/shrp2/RFPL38/L08presentation.pdf · SHRP 2 Project L08: Incorporation of Travel Time](https://reader031.fdocuments.net/reader031/viewer/2022040400/5e710f83d14576256e61a08b/html5/thumbnails/12.jpg)
Urban Streets Reliability EngineUrban Streets Reliability Engine
• Welcome
12
![Page 13: SHRP 2 L08: Incorporation of Travel Time Reliability into the …onlinepubs.trb.org/onlinepubs/shrp2/RFPL38/L08presentation.pdf · SHRP 2 Project L08: Incorporation of Travel Time](https://reader031.fdocuments.net/reader031/viewer/2022040400/5e710f83d14576256e61a08b/html5/thumbnails/13.jpg)
Step 1. Scenario GenerationStep 1. Scenario Generation
• Set Up
13
![Page 14: SHRP 2 L08: Incorporation of Travel Time Reliability into the …onlinepubs.trb.org/onlinepubs/shrp2/RFPL38/L08presentation.pdf · SHRP 2 Project L08: Incorporation of Travel Time](https://reader031.fdocuments.net/reader031/viewer/2022040400/5e710f83d14576256e61a08b/html5/thumbnails/14.jpg)
Step 1. Scenario GenerationStep 1. Scenario Generation
• Set Up
14
![Page 15: SHRP 2 L08: Incorporation of Travel Time Reliability into the …onlinepubs.trb.org/onlinepubs/shrp2/RFPL38/L08presentation.pdf · SHRP 2 Project L08: Incorporation of Travel Time](https://reader031.fdocuments.net/reader031/viewer/2022040400/5e710f83d14576256e61a08b/html5/thumbnails/15.jpg)
Step 3. Performance SummaryStep 3. Performance Summary
15
![Page 16: SHRP 2 L08: Incorporation of Travel Time Reliability into the …onlinepubs.trb.org/onlinepubs/shrp2/RFPL38/L08presentation.pdf · SHRP 2 Project L08: Incorporation of Travel Time](https://reader031.fdocuments.net/reader031/viewer/2022040400/5e710f83d14576256e61a08b/html5/thumbnails/16.jpg)
Questions/DiscussionQuestions/Discussion
16