T3 Webinar Presentation

Virtual Intersections: Using Simulated Traffic Signals in Mobile Signal Timing (MOST) Training (April 15, 2009)

Demonstration of Experiments Coordinated Signal Systems (Labs 6 through 7)

Presenter:   Darcy Bullock
Presenter's Org:   Purdue University

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Slide 1:  Demonstration of Experiments Coordinated Signal Systems (Labs 6 through 7)

Darcy Bullock (with extensive help from Anuj Sharma, Mike Inerowicz, Chris Day and Matt Wiesenfeld) Purdue University

Slide 2:  Structure of Laboratory

[Screenshots of two status screens of the ASC/3 controllers software.]

Slide 3:  Structure of Laboratory

[There are two diagrams of the MOST structure laboratory. The first diagram demonstrates the parameters that impact capacity such as a red, green, and yellow lights indicated by horizontal, contiguous rectangular boxes. The boxes are colored using their corresponding color. The second diagram demonstrates the parameters impacting progression. The diagram is of a street grid showing two intersections with parameters listed such as time, distance, offset, space, vehicle trajectory, and the directions of travel.]

Slide 4:  Traffic Control

[This is an aerial photograph of an area in Moscow, ID that demonstrates various intersecting streets and roadways. There is also a diagram of a box with arrows moving in a clockwise motion around four rectangles. The rectangle at the top contains "The user responds to the display". The rectangle to the right says "The detection system responds to the user". The rectangle at the bottom says "The control system responds to the detections". The final rectangle to the left contains "The display responds to the control system". The diagram demonstrates how each component must be coordinated with one another to maintain traffic control.]

Slide 5:  How does coordination influence system operation

[This slide is an image of a mathematical formula containing various variables that describe how coordination influences system operations. The formula contains three main variables: offset, cycle, and split. There is a key that lists definitions for other variables within the formula.]

Slide 6:  Split, Cycle, and Offset are the main levers for controlling the system ... but there is more

[This slide displays other variables that control the traffic control system. Each variable is listed along with a chart or graph. The variables are Typical 24-hour Flow Pattern, Discrete Design Volumes, and Morning Synchro Analysis Timing Report. The slide also contains a picture of the encased hardware used to control traffic.]

Slide 7:  Elements of a Controller Database

[This is a pivot table of the elements of a controller database. The elements across the top are detector, controller, coordinator, and time base. The elements along the left side are UTDF to NTCIP Direct Mapping, UTDF to NTCIP Mapping With Translation, UTDF to NTCIP Mapping with Engineering Judgment, and NTCIP Parameters Require but Unidentified in UTDF. The first two rows are green while the last two rows are red.]

Slide 8:  Entire Process

[This is a flow chart of the components that go into the entire traffic control process. Each component is represented by an image. There are arrows going in various directions to show the relationships.]

Slide 9:  Structure of Lab 6 & 7

Lab 6

  1. Coordination Status Screens
  2. Detector Mapping
  3. Detector Extension
  4. Split Manipulation
  5. Split Tuning
  6. Split Allocation Strategies
  7. Cycle Length Adjustments
  8. Offset Adjustments
  9. Lead/Lag
  10. Capacity Estimation
  11. Synchro Mapping

Lab 7

Pulling together the 270-300 parameters necessary to implement a functional 3 plan system

Slide 10:  Coordination Status Screens

[This is a screenshot of a screen of the ASC/3 controllers from a simulation. This demonstrates step #1 of lab #6 which is Coordination Status Screens.]

Slide 11:  Detector mapping

[The first screenshot is of the ASC/3 controllers from a simulation. The second screenshot shows the database controllers. This is step two of laboratory #6, which is Detector Mapping.]

Slide 12:  Repeat of Slide 11

Slide 13:  Split Manipulation.

[This is a screenshot of the traffic simulation software displaying Split Manipulation.]

Slide 14:  Split Tuning

[The first screenshot is of the ASC/3 controllers from a traffic simulation displaying Split Tuning. The second screenshot shows a traffic simulation. This is step five of laboratory #6.]

Slide 15:  Split Allocation Strategies

[This is a screenshot of 6th step of laboratory #6, which is Split Allocation Strategies. There are three charts that lists numbers and percentages for each allocation: Effective Splits with Maximum Recalls, Effective Splits with Floating Force-Offs, and Effective Splits with Fixed Force-Offs.]

Slide 16:  Cycle Length Adjustments

[This is an image the 7th step of laboratory #6, which is Cycle Length Adjustments. There is a chart that lists three columns across the top labeled "Controller/Cycle Length", "No. of Vehicles EB Left Turn Pocket", and "No. of Vehicles WB Left Turn Pocket" from left to right. The rows listed on the left contain "During Step 3" and "During Step 4" from top to bottom. There is also a screenshot of the ASC/3 controllers from a traffic simulation displaying Cycle Length Adjustments.]

Slide 17:  Offset Adjustments

[This is an image of the 8th step of laboratory #6, which is Offset Adjustments. There is a chart that displays the numerical values of the Offset Quality cycles one and two. There are also two screenshots of the ASC/3 controllers from a traffic simulation displaying Offset Adjustments.]

Slide 18:  Lead/Lag

[There is a screenshot of the ASC/3 controllers from a traffic simulation displaying Lead/Lag. There is an image of the 9th step of laboratory #6, which is Lead/Leg. There is a chart that displays the numerical values of the Lead/Lag in cycle one. ]

Slide 19:  Capacity Estimation

[This is a screenshot of the 10th step of laboratory #6, which is Capacity Estimation. There are three charts that lists numbers and percentages for each allocation: Effective Splits with Maximum Recalls, Effective Splits with Floating Force-Offs, and Effective Splits with Fixed Force-Offs. There is also a graph that compares the difference between programmed and observed traffic capacity.]

Slide 20:  Synchro Mapping

[This image displays the 11th step of laboratory 6, which is Synchro Mapping. This is a screenshot of the traffic simulation software displaying Synchro Mapping.]

Slide 21:  Lab 7: Pulling together the 270-300 parameters necessary to implement a functional 3 plan system

[This is a pivot table of the elements of a controller database. The elements across the top are detector, controller, coordinator, and time base. The elements along the left side are UTDF to NTCIP Direct Mapping, UTDF to NTCIP Mapping With Translation, UTDF to NTCIP Mapping with Engineering Judgment, and NTCIP Parameters Require but Unidentified in UTDF. The first two rows are green while the last two rows are red. The table demonstrates the culmination of the various parameters needed to implement a functional 3 plan system.]

Slide 22:  Repeat of Slide 9

Slide 23:  Field Quality Experience ... without the risk

[This is a flow chart of the components that go into the entire traffic control process. Each component is represented by an image. There are arrows going in various directions to show the relationships.]

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