TFHRC Home > Safety > Safety Publications > Task Analysis of Intersection Driving Scenarios: Information Processing Bottlenecks
August 2006
FHWA-HRT-06-033
U.S. Department of Transportation
Federal Highway Administration
Research, Development, and Technology
Turner-Fairbank Highway Research Center
6300 Georgetown Pike
McLean, VA 22101-2296
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The purpose of this report is to identify the information processing bottlenecks that drivers face in specific intersection driving scenarios. These bottlenecks represent situations in which drivers may become overloaded by driving demands, which could result in drivers conducting important driving tasks improperly or skipping certain tasks altogether. To identify and characterize information processing bottlenecks, this report presents a series of task analyses to determine key functions performed by drivers as they approach and navigate through different intersection scenarios. These task analyses focus on identifying the underlying information processing elements, including the perceptual, cognitive, and psychomotor subtasks associated with each individual driving task. A key benefit of using a task analysis approach is that it provides specific information about driver activities at various points during intersection navigation. This level of information is not made available using other approaches, such as crash data analyses, performance studies, and focus group research. This information about driver activities also can be quantified in relation to overall workload to identify when and under what conditions information processing bottlenecks occur.
Michael Trentacoste
Director, Office of Safety Research and Development
Notice
This document is disseminated under the sponsorship of the U.S. Department of Transportation in the interest of information exchange. The U.S. Government assumes no liability for the use of the information contained in this document.
The U.S. Government does not endorse products or manufacturers. Trademarks or manufacturers' names appear in this report only because they are considered essential to the objective of the document.
Quality Assurance Statement
The Federal Highway Administration (FHWA) provides high-quality information to serve Government, industry, and the public in a manner that promotes public understanding. Standards and policies are used to ensure and maximize the quality, objectivity, utility, and integrity of its information. FHWA periodically reviews quality issues and adjusts its programs and processes to ensure continuous quality improvement.
Technical Report Documentation Page |
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1. Report No.
FHWA-HRT-06-033 |
2. Government Accession No. | 3. Recipient's Catalog No. | |||
4. Title and Subtitle
Task Analysis of Intersection Driving Scenarios: Information Processing Bottlenecks |
5. Report Date
August 2006 |
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6. Performing Organization Code | |||||
7. Author(s)
C.M. Richard, J.L. Campbell, and J.L. Brown |
8. Performing Organization Report No. | ||||
9.
Performing Organization Name and Address
Battelle Human Transportation Center 1100 Dexter Avenue North, Suite 400 Seattle, WA 98109-3598 |
10. Work Unit No. (TRAIS) | ||||
11. Contract or Grant No.
DTFH61-04-C-00006 |
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12. Sponsoring Agency Name
and Address
Office of Safety Research and Development Federal Highway Administration 6300 Georgetown Pike McLean, VA 22101-2296 |
13. Type of Report and
Period Covered
Final, August 2004-August 2005 |
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14. Sponsoring Agency Code | |||||
15. Supplementary Notes: Contracting Officer's Technical Representative (COTR), Raymond A. Krammes; Task Manager, Thomas M. Granda |
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16. Abstract
The purpose of this report is to identify the information processing bottlenecks that drivers face in specific intersection driving scenarios. These bottlenecks represent situations in which drivers may become overloaded by driving demands, which could result in drivers conducting important driving tasks in improper fashion or skipping certain tasks altogether. To identify and characterize information processing bottlenecks, this report presents a series of task analyses to determine key functions performed by drivers as they approach and navigate through different intersection scenarios. The focus of this task analysis is on identifying the underlying information processing elements, including the perceptual, cognitive, and psychomotor subtasks associated with each individual driving task. Seven distinct driving scenarios were investigated in the task analysis, and each scenario was successively separated into segments, tasks, and subtasks/information processing elements. The scenarios included in the analysis were: (1) left turn on green light, (2) left turn on yellow light, (3) straight on yellow light, (4) straight on green light, (5) right turn on green light, (6) right turn on red light, and (7) stop on red light. Appendix A discusses in detail the equations and assumptions associated with the development of the vehicle timing/dynamics calculations performed for each of the seven driving scenarios included in the effort. |
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17. Key
Words
task analysis, driver behavior, intersections, information processing, driver workload |
18. Distribution Statement
No restrictions. This document is available to the public through the National Technical Information Service, Springfield, VA 22161 |
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19. Security Classif. (of
this report)
Unclassified |
20. Security Classif. (of
this page)
Unclassified |
21. No. of Pages
219 |
22. Price |
Form DOT F 1700.7 (8-72) Reproduction of completed page authorized
SI* (Modern Metric) Conversion Factors
SECTION 2. METHODS
Scenario Selection
Scenario Analysis Components
Scenario Description and Assumptions
Scenario Timeline
Task Analysis Table
Segment Analyses
Scenario-wide Analysis
Limitations
SECTION 3. RESULTS
Scenario 1–Left Turn on Green Light
Description
Scenario Timeline
Task Analysis Table
Scenario 1, Segment 1, Approach
Scenario 1, Segment 2, Deceleration
Scenario 1, Segment 3, Intersection Entry
Scenario 1, Segment 4, Prepare for Turn
Scenario 1, Segment 5, Execute Turn
Scenario-Wide Analysis
Information Processing Bottlenecks
Scenario 2–Left Turn on Yellow Light
Description
Scenario Timeline
Task Analysis Table
Segment Analysis
Scenario 2, Segment 1, Approach
Scenario 2, Segment 2, Deceleration
Scenario 2, Segment 3, Decision to Proceed
Scenario 2, Segment 4, Intersection Entry
Scenario 2, Segment 5, Execute Turn
Scenario-Wide Analysis
Information Processing Bottlenecks
Scenario 3–Straight on Yellow Light
Description
Scenario Timeline
Task Analysis Table
Segment Analysis
Scenario 3, Segment 1, Approach
Scenario 3, Segment 2, Decision to Proceed
Scenario 3, Segment 3, Intersection Entry
Scenario-Wide Analysis
Scenario 4–Straight on Green Light
Description
Scenario 4 Timeline
Task Analysis Table
Segment Analysis
Scenario 4, Segment 1, Approach
Scenario 4, Segment 2, Prepare for Lane Change
Scenario 4, Segment 3, Execute Lane Change
Scenario 4, Segment 4, Intersection Entry
Scenario-Wide Analysis
Information Processing Bottlenecks
Scenario 5–Right Turn on Green Light
Description
Scenario Timeline
Task Analysis Table
Segment Analysis
Scenario 5, Segment 1, Approach
Scenario 5, Segment 2, Deceleration
Scenario 5, Segment 3, Intersection Entry
Scenario 5, Segment 4, Execute Turn
Scenario-Wide Analysis
Information Processing Bottlenecks
Scenario 6–Right Turn on Red Light
Description
Scenario Timeline
Task Analysis Table
Segment Analysis
Scenario 6, Segment 1, Approach
Scenario 6, Segment 2, Prepare for Lane Change
Scenario 6, Segment 3, Execute Lane Change
Scenario 6, Segment 4, Stop
Scenario 6, Segment 5, Prepare for Turn/Intersection Entry
Scenario 6, Segment 6, Execute Turn
Scenario-Wide Analysis
Information Processing Bottlenecks
Scenario 7–Stop on Red Light
Description
Scenario Timeline
Task Analysis Table
Segment Analysis
Scenario 7, Segment 1, Approach
Scenario 7, Segment 2, Stop
Scenario 7, Segment 3, Proceed Through Intersection
Scenario-Wide Analysis
Information Processing Bottlenecks
SECTION 4. SUMMARY AND CONCLUSIONS
Summary of Results
Approach Segments Summary of Key Information Processing Bottlenecks
Prepare for Lane
Change and Execute Lane Change Segments Summary of Key Information Processing Bottlenecks
Deceleration/Stop Segments
Summary of Key Information Processing Bottlenecks
Decision to Proceed
Segments Summary of Key Information Processing Bottlenecks
Intersection Entry Segments
Summary of Key Information Processing Bottlenecks
Prepare for Turn Segments
Summary of Key Information Processing Bottlenecks
Execute Turn Segments
Summary of Key Information Processing Bottlenecks
General
Conclusions on the Nature of the Bottlenecks
Advantages
of the Task Analysis Approach
Future Research
APPENDIX A. SCENARIO TIMING AND KINEMATICS
General Assumptions
Scenario Kinematics
Scenario 1–Left Turn on Green Light
Milestone A-Street sign becomes readable
Milestone B-Comfortable braking distance
Milestone C-Vehicle stops
Milestone D-Turn completed
Scenario 2–Left Turn on Yellow Light
Milestone A-Comfortable braking distance
Milestone B-Traffic signal turns yellow.
Milestone C-Vehicle reaches turning speed
Milestone D-Initiate turn
Milestone E-Turn completed
Milestone F-Braking distance for stopping in the intersection
Milestone G-Last point for emergency maneuver in reaction to red-light runners
Scenario 3–Straight on Yellow Light
Milestone A-Farthest distance to legally proceed
Milestone B-Aggressive braking distance
Milestone C-Last point for emergency maneuver in reaction to red-light runners
Milestone D-Last point for emergency maneuver in reaction
to oncoming traffic turning left at the last minute
Scenario 4–Straight on Green Light
Milestone A-Driver detects lead vehicle braking
Milestone B-Complete preparation for lane change
Milestone C-Complete lane change
Milestone D-Last point for emergency maneuver in reaction to red-light-runners
Milestone E-Last point for emergency maneuver in reaction to oncoming traffic turning left at the last minute
Scenario 5–Right Turn on Green
Milestone A-Street sign becomes readable
Milestone B-Comfortable braking distance
Milestone C-Vehicle reaches turning speed
Milestone D-Initiate turn
Milestone E-Turn completed
Milestone F-Braking distance for stopping in the intersection
Scenario 6–Right Turn on Red Light
Milestone A-Complete preparation for lane change
Milestone B-Complete lane change
Milestone C-Braking distance
Milestone D-Vehicle stops
Milestone E-Turn completed
Scenario 7–Stop on Red Light
Milestone A-Driver detects and responds to lead vehicle braking
Milestone B-Vehicle stops
LIST OF FIGURES
Figure 1. An outline diagram showing organization of components of each scenario analysis
Figure 2. Example scenario plan diagram identifying key assumptions
Figure 3. Two-page layout of segment analysis showing key components
Figure 4. Scenario 1–Left Turn on Green Light diagram, details, and assumptions
Figure 5. Scenario 1–Left Turn on Green Light timeline depicting key segment phases duration and event/task milestones
Figure 6. Scenario 1-Left Turn on Green Light Approach segment scenario diagram
Figure 7. Scenario 1-Left Turn on Green Light Deceleration Segment scenario diagram
Figure 8. Scenario 1–Left Turn on Green Light Intersection Entry segment scenario diagram
Figure 9. Scenario 1–Left Turn on Green Light Prepare for Turn segment scenario diagram
Figure 10. Scenario 1–Left Turn on Green Light Execute Turn segment scenario diagram
Figure 11. Scenario 1–Left Turn on Green Light total estimated workload ratings for all tasks in each segment
Figure 12. Scenario 1–Left Turn on Green Light average estimated workload ratings per task for each scenario segment
Figure 13. Scenario 2–Left Turn on Yellow Light diagram, details, and assumptions
Figure 14. Scenario 2–Left Turn on Yellow Light timeline depicting key segment phases duration and event/task milestones
Figure 15. Scenario 2–Left Turn on Yellow Light Approach segment scenario diagram
Figure 16. Scenario 2–Left Turn on Yellow Light Deceleration segment scenario diagram
Figure 17. Scenario 2–Left Turn on Yellow Light Decision to Proceed segment scenario diagram
Figure 18. Scenario 2–Left Turn on Yellow Light Intersection Entry segment scenario diagram
Figure 19. Scenario 2–Left Turn on Yellow Light Execute Turn segment scenario diagram
Figure 20. Scenario 2–Left Turn on Yellow Light total estimated workload ratings for all tasks in each scenario segment
Figure 21. Scenario 2–Left Turn on Yellow Light average estimated workload ratings per task for each scenario segment
Figure 22. Scenario 3–Straight on Yellow Light diagram, details, and assumptions
Figure 23. Scenario 3–Straight on Yellow Light timeline depicting duration of key segment phases and event/task milestones
Figure 24. Scenario 3–Straight on Yellow Light Approach segment diagram
Figure 25. Scenario 3–Straight on Yellow Light Scenario Decision to Proceed segment diagram
Figure 26. Scenario 3–Straight on Yellow Light Intersection Entry segment diagram
Figure 27. Scenario 3–Straight on Yellow Light total estimated workload ratings for all tasks in each scenario segment
Figure 28. Scenario 3–Straight on Yellow Light average estimated workload ratings per task for each scenario segment
Figure 29. Scenario 4–Straight on Green Light diagram, details, and assumptions
Figure 30. Scenario 4–Straight on Green Light timeline of key segment phases duration and event/task milestones.
Figure 31. Scenario 4–Straight on Green Light Approach segment diagram
Figure 32. Scenario 4–Straight on Green Light Prepare for Lane Change segment diagram
Figure 33. Scenario 4–Straight on Green Light Execute Lane Change segment of
scenario diagram
Figure 34. Scenario 4–Straight on Green Light Intersection Entry segment diagram
Figure 35. Scenario 4–Straight on Green Light total estimated workload ratings for all tasks in each scenario segment
Figure 36. Scenario 4–Straight on Green Light average estimated workload ratings per task for each scenario segment
Figure 37. Scenario 5–Right Turn on Green Light diagram, details, and assumptions
Figure 38. Scenario 5–Right Turn on Green Light timeline of key segment phases duration and task milestones
Figure 39. Scenario 5–Right Turn on Green Light Approach segment diagram
Figure 40. Scenario 5–Right Turn on Green Light Deceleration segment diagram
Figure 41. Scenario 5–Right Turn on Green Light Intersection Entry segment diagram
Figure 42. Scenario 5–Right Turn on Green Light Execute Turn segment diagram
Figure 43. Scenario 5–Right Turn on Green Light total estimated workload ratings for all tasks in each scenario segment
Figure 44. Scenario 5–Right Turn on Green Light average estimated workload ratings per task for each scenario segment
Figure 45. Scenario 6–Right Turn on Red Light scenario diagram, details, and assumptions
Figure 46. Scenario 6–Right Turn on Red Light Scenario timeline depicting key segment phases duration and event/task milestones
Figure 47. Scenario 6–Right Turn on Red Light Approach segment scenario diagram
Figure 48. Scenario 6–Right Turn on Red Light Prepare for Lane Change segment of scenario diagram.
Figure 49. Scenario 6–Right Turn on Red Light Execute Lane Change segment diagram
Figure 50. Scenario 6–Right Turn on Red Light Stop segment diagram
Figure 51. Scenario 6–Right Turn on Red Light Prepare for Turn/Intersection Entry segment of scenario diagram
Figure 52. Scenario 6–Right Turn on Red Light Execute Turn segment diagram
Figure 53. Scenario 6–Right Turn on Red Light total estimated workload ratings for all tasks in each scenario segment
Figure 54. Scenario 6–Right Turn on Red Light average estimated workload ratings per task for each scenario segment
Figure 55. Scenario 7–Stop on Red Light diagram, details, and assumptions
Figure 56. Scenario 7–Stop on Red Light Scenario timeline depicting key segment phases duration and event/task milestones
Figure 57. Scenario 7–Stop on Red Light Approach segment diagram
Figure 58. Scenario 7–Stop on Red Light Stop segment diagram
Figure 59. Scenario 7–Stop on Red Light Proceed Through Intersection segment diagram
Figure 60. Scenario 7–Stop on Red Light total estimated workload ratings for all tasks in each scenario segment.
Figure 61. Scenario 7–Stop on Red Light average estimated workload ratings per task for each scenario segment.
Figure 62. Scenario 1–Left Turn on Green Light timeline depicting key temporal milestones
Figure 63. Scenario 2–Left Turn on Yellow Light timeline depicting key temporal milestones
Figure 64. Scenario 3–Straight on Yellow Light timeline depicting key temporal milestones
Figure 65. Scenario 4–Straight on Green Light timeline depicting key temporal milestones
Figure 66. Scenario 5–Right Turn on Green Light timeline depicting key temporal milestones
Figure 67. Scenario 6–Right Turn on Red Light timeline depicting key temporal milestones
Figure 68. Scenario 7–Stop on Red Light timeline depicting key temporal milestones
LIST OF TABLES
Table 1. Information sources used in the task analysis.
Table 2. Workload estimation chart used to determine workload estimates for each segment task.
Table 3. Scenario 1–Left Turn on Green Light scenario partitioning based on driving
objectives and speed characteristics by segment.
Table 4. Scenario 1–Left Turn on Green Light assumptions and corresponding justifications.
Table 5. Scenario 1–Left Turn on Green Light task analysis table.
Table 6. Scenario 1–Left Turn on Green Light Approach segment tasks and information processing subtasks.
Table 7. Scenario 1–Left Turn on Green Light Approach
segment relative timing and duration of segment tasks and summary of key findings.
Table 8. Scenario 1–Left Turn on Green Light Deceleration
segment tasks and information processing subtasks.
Table 9. Scenario 1–Left Turn on Green Light Deceleration
segment relative timing and duration of segment tasks and summary of key findings.
Table 10. Scenario 1–Left Turn on Green Light Intersection
Entry segment tasks and information processing subtasks involved.
Table 11. Scenario 1–Left Turn on Green Light Intersection
Entry segment relative timing and duration of segment tasks and summary of key findings.
Table 12. Scenario 1–Left Turn on Green Light Prepare for Turn segment tasks and information processing subtasks.
Table 13. Scenario 1–Left Turn on Green Light Prepare for Turn segment relative timing and duration of segment tasks and summary of key findings.
Table 14. Scenario 1–Left Turn on Green Light Execute Turn segment tasks and information processing subtasks.
Table 15. Scenario 1–Left Turn on Green Light Execute Turn segment relative timing and duration of segment tasks and summary of key findings.
Table 16. Scenario 1–Left Turn on Green Light combined and average workload ratings, pacing of key tasks, and nature of bottlenecks that indicate potential problems for each scenario segment.
Table 17. Scenario 2–Left Turn on Yellow Light driving objectives and speed characteristics as basis for each scenario segment partitioning.
Table 18. Scenario 2–Left Turn on Yellow Light assumptions and corresponding justifications.
Table 19. Scenario 2–Left Turn on Yellow Light task analysis table.
Table 19. Scenario 2–Left Turn on Yellow Light task analysis table, continued.
Table 20. Scenario 2–Left Turn on Yellow Light Approach segment tasks and information processing subtasks.
Table 21. Scenario 2–Left Turn on Yellow Light Approach
segment relative timing and duration of segment tasks and summary of key findings.
Table 22. Scenario 2–Left Turn on Yellow Light Deceleration segment tasks and information processing subtasks.
Table 23. Scenario 2–Left Turn on Yellow Light Deceleration segment relative timing and duration of segment tasks and summary of key findings.
Table 24. Scenario 2–Left Turn on Yellow Light Decision to Proceed segment tasks and information processing subtasks.
Table 25. Scenario 2–Left Turn on Yellow Light Decision
to Proceed segment relative timing and duration of segment tasks and summary of key findings.
Table 26. Scenario 2–Left Turn on Yellow Light Intersection
Entry segment tasks and information processing subtasks.
Table 27. Scenario 2–Left Turn on Yellow Light Intersection
Entry segment relative timing and duration of segment tasks and summary of key findings.
Table 28. Scenario 2–Left Turn on Yellow Light Execute Turn Segment tasks and information processing subtasks.
Table 29. Scenario 2–Left Turn on Yellow Light Execute
Turn segment relative timing and duration of segment tasks and summary of key findings.
Table 30. Scenario 2–Left Turn on Yellow Light combined and average workload ratings,
pacing of key tasks, and the nature of bottlenecks that indicate potential problems for each scenario segment.
Table 31. Scenario 3–Straight on Yellow Light driving objectives and speed
characteristics for each scenario segment as a basis for the scenario partitioning.
Table 32. Scenario 3–Straight on Yellow Light assumptions and corresponding justifications.
Table 33. Scenario 3–Straight on Yellow Light task analysis table.
Table 34. Scenario 3–Straight on Yellow Light Approach segment tasks and information processing subtasks.
Table 35. Scenario 3–Straight on Yellow Light Approach segment relative timing and duration of segment tasks and summary of key findings.
Table 36. Scenario 3–Straight on Yellow Light segment 2 Decision to Proceed tasks and information processing subtasks.
Table 37. Scenario 3–Straight on Yellow Light Decision to Proceed segment relative timing and duration of segment tasks and summary of key findings.
Table 38. Scenario 3–Straight on Yellow Light Intersection Entry segment of tasks and information processing subtasks.
Table 39. Scenario 3–Straight on Yellow Light Intersection Entry segment relative timing and duration of segment tasks and summary of key findings.
Table 40. Scenario 3–Straight on Yellow Light combined and average workload ratings, pacing of key tasks, and the nature of bottlenecks that indicate potential problems for each scenario segment.
Table 41. Scenario 4–Straight on Green Light driving objectives and speed characteristics for each scenario segment as a basis for the scenario partitioning.
Table 42. Scenario 4–Straight on Green Light assumptions and corresponding justifications.
Table 43. Scenario 4–Straight on Green Light task analysis table.
Table 44. Scenario 4–Straight on Green Light Approach segment tasks and information processing subtasks.
Table 45. Relative timing and duration of segment tasks and summary of key findings for the Approach segment of Scenario 4–Straight on Green Light.
Table 46. Scenario 4–Straight on Green Light Prepare for Lane Change segment of tasks and information processing subtasks.
Table 47. Scenario 4–Straight on Green Light Prepare for Lane Change segment relative timing and duration of segment tasks and summary of key findings.
Table 48. Scenario 4–Straight on Green Light Execute Lane Change segment tasks and information processing subtasks.
Table 49. Scenario 4–Straight on Green Light Execute Lane Change segment of relative timing and duration of segment tasks and summary of key findings.
Table 50. Scenario 4–Straight on Green Light Intersection Entry segment tasks and information processing subtasks.
Table 51. Scenario 4–Straight on Green Light Intersection Entry segment of relative timing and duration of segment tasks and summary of key findings.
Table 52. Combined and average workload ratings, pacing of key tasks, and nature of bottlenecks that indicate potential problems for each scenario segment.
Table 53. Scenario 5–Right Turn on Green Light driving objectives and speed characteristics for each scenario segment used as a basis for the scenario partitioning.
Table 54. Scenario 5–Right Turn on Green Light assumptions and corresponding justifications.
Table 55. Scenario 5–Right Turn on Green Light task analysis table.
Table 56. Scenario 5–Right Turn on Green Light Approach segment tasks and information processing subtasks.
Table 57. Scenario 5–Right Turn on Green Light Approach segment relative timing and duration of segment tasks and summary of key findings.
Table 58. Scenario 5–Right Turn on Green Light Deceleration segment tasks and information processing subtasks.
Table 59. Scenario 5–Right Turn on Green Light Deceleration segment relative timing and duration of segment tasks and summary of key findings.
Table 60. Scenario 5–Right Turn on Green Light Intersection Entry segment tasks and information processing subtasks.
Table 61. Scenario 5–Right Turn on Green Light Intersection Entry segment of relative timing and duration of segment tasks and summary of key findings.
Table 62. Scenario 5–Right Turn on Green Light Execute Turn segment tasks and information processing subtasks.
Table 63. Scenario 5–Right Turn on Green Light Execute Turn segment relative timing and duration of segment tasks and summary of key findings.
Table 64. Scenario 5–Right Turn on Green Light combined and average workload ratings, pacing of key tasks, and nature of bottlenecks that indicate potential problems for each scenario segment.
Table 65. Scenario 6–Right Turn on Red Light driving objectives and speed characteristics for each scenario segment as a basis for the scenario partitioning.
Table 66. Scenario 6–Right Turn on Red Light assumptions and corresponding justifications.
Table 67. Scenario 6–Right Turn on Red Light task analysis table.
Table 68. Scenario 6–Right Turn on Red Light Approach segment tasks and information processing subtasks.
Table 69. Scenario 6–Right Turn on Red Light Approach segment relative timing and duration of segment tasks and summary of key findings.
Table 70. Scenario 6–Right Turn on Red Light Prepare for Lane Change segment tasks and information processing subtasks.
Table 71. Scenario 6–Right Turn on Red Light Prepare for Lane Change segment of relative timing and duration of segment tasks and summary of key findings.
Table 72. Scenario 6–Right Turn on Red Light Execute Lane Change segment tasks and information processing subtasks.
Table 73. Scenario 6–Right Turn on Red Light Execute Lane Change segment of relative timing and duration of segment tasks and summary of key findings.
Table 74. Stop Segment of Scenario 6–Right Turn on Red Light tasks and information processing subtasks.
Table 75. Scenario 6–Right Turn on Red Light Stop segment of relative timing and duration of segment tasks and summary of key findings.
Table 76. Scenario 6–Right Turn on Red Light Prepare for Turn/Intersection Entry segment tasks and information processing subtasks.
Table 77. Scenario 6–Right Turn on Red Light Prepare for Turn / Intersection Entry segment relative timing and duration of segment tasks and summary of key findings.
Table 78. Scenario 6–Right Turn on Red Light Execute Turn segment tasks and information processing subtasks.
Table 79. Scenario 6–Right Turn on Red Light Execute Turn segment of relative timing and duration of segment tasks and summary of key findings.
Table 80. Scenario 6–Right Turn on Red Light combined and average workload ratings, pacing of key tasks, and nature of bottlenecks that indicate potential problems for each scenario segment.
Table 81. Scenario 7–Stop on Red Light driving objectives and speed characteristics for each scenario segment used as a basis for the scenario partitioning.
Table 82. Scenario 7–Stop on Red Light assumptions and corresponding justifications.
Table 83. Scenario 7–Stop on Red Light task analysis table.
Table 84. Scenario 7–Stop on Red Light Approach segment tasks and information processing subtasks.
Table 85. Scenario 7–Stop on Red Light Approach segment of relative timing and duration of segment tasks and summary of key findings.
Table 86. Scenario 7–Stop on Red Light Stop segment tasks and information processing
subtasks.
Table 87. Scenario 7–Stop on Red Light Stop segment of relative timing and duration of segment tasks and summary of key findings.
Table 88. Scenario 7–Stop on Red Light Proceed Through Intersection segment tasks and information processing subtasks.
Table 89. Scenario 7–Stop on Red Light Proceed Through Intersection segment of relative timing and duration of segment tasks and summary of key findings.
Table 90. Combined and average workload ratings, pacing of key tasks, and nature of bottlenecks that indicate potential problems for each scenario segment.
Table 91. A summary of the nature of the information processing bottlenecks for each scenario.
Table 92. Commonly applied assumptions with corresponding justification.
Table 93. Scenario 1–Left Turn on Green Light description of key temporal milestones.
Table 94. Scenario 1–Left Turn on Green Light equations and assumptions for Milestone A.
Table 95. Scenario 1–Left Turn on Green Light, Milestone B, equations and assumptions.
Table 96. Scenario 1–Left Turn on Green Light, Milestone C, equations and assumptions.
Table 97. Scenario 1–Left Turn on Green Light, Milestone D, equations and assumptions.
Table 98. Scenario 2–Left Turn on Yellow Light description of key temporal milestones.
Table 99. Scenario 2–Left Turn on Yellow Light, Milestone A, equations and assumptions.
Table 100. Scenario 2–Left Turn on Yellow Light, Milestone B, equations and assumptions.
Table 101. Scenario 2–Left Turn on Yellow Light, Milestone C, equations and assumptions.
Table 102. Scenario 2–Left Turn on Yellow Light, Milestone D, equations and assumptions.
Table 103. Scenario 2–Left Turn on Yellow Light, Milestone E, equations and assumptions.
Table 104. Scenario 2–Left Turn on Yellow Light, Milestone F, equations and assumptions.
Table 105. Scenario 2–Left Turn on Yellow Light, Milestone G, equations and assumptions.
Table 106. Scenario 3–Straight on Yellow Light description of key temporal milestones.
Table 107. Scenario 3–Straight on Yellow Light, Milestone A, equations and assumptions.
Table 108. Scenario 3–Straight on Yellow Light, Milestone B, equations and assumptions.
Table 109. Scenario 3–Straight on Yellow Light, Milestone C, equations and assumptions.
Table 110. Scenario 3–Straight on Yellow Light, Milestone D, equations and assumptions.
Table 111. Scenario 4–Straight on Green Light description of key temporal milestones.
Table 112. Scenario 4–Straight on Green Light, Milestone A, equations and assumptions.
Table 113. Scenario 4–Straight on Green Light, Milestone B, equations and assumptions.
Table 114. Scenario 4–Straight on Green Light, Milestone C, equations and assumptions.
Table 115. Scenario 4–Straight on Green Light, Milestone D, equations and assumptions.
Table 116. Scenario 4–Straight on Green Light, Milestone E, equations and assumptions.
Table 117. Scenario 5–Right Turn on Green Light description of key temporal milestones.
Table 118. Scenario 5–Right Turn on Green Light, Milestone A, equations and assumptions.
Table 119. Scenario 5–Right Turn on Green Light, Milestone B, equations and assumptions.
Table 120. Scenario 5–Right Turn on Green Light, Milestone C, equations and assumptions.
Table 121. Scenario 5–Right Turn on Green Light, Milestone D, equations and assumptions.
Table 122. Scenario 5–Right Turn on Green Light, Milestone E, equations and assumptions.
Table 123. Scenario 5–Right Turn on Green Light, Milestone F, equations and assumptions.
Table 124. Scenario 6–Right Turn on Red Light description of key temporal milestones.
Table 125. Scenario 6–Right Turn on Red Light, Milestone A, equations and assumptions.
Table 126. Scenario 6–Right Turn on Red Light, Milestone B, equations and assumptions.
Table 127. Scenario 6–Right Turn on Red Light, Milestone C, equations and assumptions.
Table 128. Scenario 6–Right Turn on Red Light, Milestone D, equations and assumptions.
Table 129. Scenario 6–Right Turn on Red Light, Milestone E, equations and assumptions.
Table 130. Scenario 7–Stop on Red Light description of key temporal milestones.
Table 131. Scenario 7–Stop on Red Light, Milestone A, equations and assumptions.
Table 132. Scenario 7–Stop on Red Light, Milestone B, equations and assumptions.
LIST OF ACRONYMS
AASHTO - American Association of State Highway and Transportation Officials
FHWA - Federal Highway Administration
GES - General Estimates System
LTAP/LD - left turn across path-lateral direction conflict
LTAP/OD - left turn across path-opposite direction conflict
LVM - lead-vehicle moving
LVS - lead-vehicle stationary
MSK - meter-second-kilogram
MUTCD - Manual of Uniform Traffic Control Devices
NA - not applicable
POV - principle other vehicle
RT - reaction time
SI - International System of Units
TTC - time-to-collision
FHWA-HRT-06-033
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