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BYU CE 562 - An Introduction to Coordinating Multiple Signals

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CE562 Traffic EngineeringTerm Project: An Introduction to Coordinating Multiple Signals(Instructions for Preparing a 900E Arterial Model by Synchro 7)Step 1. In the Map window, create a 6-signal 900 E arterial from the University Parkway intersection to Center St. intersection: Center St., 450 N, 700 N, 900 N, Birch Lane, University Parkway. External links should be at minimum 600 ft for simulation purpose. (See Page 21-1 of the Synchro 7 manual to find out why this much length isneeded. We do not conduct simulation analysis in this class; we use SimTraffic to verify the correctness of entered data.) The link length between 900E & University Parkway and 900 E & Center St. is approximately 8,400 ft according to Google Earth. You have to know the distance of between two points, say between University Parkway and Center Street on 900 E for instance to correctly scale the background image.Note that the N-S is 900E and the signals are coordinated in this direction. This means phase 2 and phase 6 are in the north-south direction (you will learn this in step3). According to the i2 software in the Transportation Lab, phase 2 is set for northbound. Once the background is attached, complete the system by adding four more signalized intersections. Use the background aerial image to locate the other four signalized intersections. The background image is available from the Term Project page of the course website.Step 2. For each of the six signals, choose the evening peak hour (See the timing data sheets for the six intersections between Center St. and University Parkway inclusive). Linksfor all these data files are found in the Term Project page. Let’s consider 16:30-17:30hr of the day as the evening peak. Determine hourly approach volumes and PHFs using the volume count data found in the Term Project page. We assume that all approaches at each intersection have the same PHF. Step 3. Enter data in the Layout, Volume, Timing, and Phasing windows using the information you find in the signal data sheets. Examine the timing sheets carefully. Check which signals are pre-timed or actuated. If actuated, it will become “actuated-coordinated” intersection. Click the Lock Timing button to “simulate” the existing case by Synchro. Pay attention to the physical layout of approach lanes in the Map window of Synchro 7. Also, use SimTraffic to see whether input data were entered correctly (especially the existence of detectors and signal timings). Note that coordinated through vehicles must have phases 2 and 6. In this case the north-south direction gets phases 2 (northbound) and 6 (southbound). You need to check the cycle lengths and green time splits of these signals by yourself in the Transportation Lab. You can see the current signal timing data using the i2 software available on thePC, second from the left. The instructor or the TA will show you how to see them.Step 4. After the correctness of input data entry is confirmed, get summary reports from Synchro. Select MOEs you want to use. (Delays, number of stops, and queue lengthsare some of the MOEs interesting to use. Always think about how you write a final report of this term project. This file is called the existing case.Step 5. After Step 4, make two copies of the existing case and name it “optimized case” and “zero offset case.” Deselect the Lock Timing button and go to the Time-Spacediagram. Play with offsets to see how green bands, vehicle paths (queue sizes) change. Find out manually the values of offsets that appear to minimize the queue size at each intersection. (Note this is one important part of this 6-signal 900E arterial exercise. Which would be better, increasing offset or decreasing offset? This exercise will prepare you for the topics in Chapter 26.) Write down your observations to include in your report. Getting a few screen shots will be of great help later on. Get a screen shot of the existing case BEFORE you play with the offsets, and a screen shot for the zero offset case (called “simultaneous” progression), and optimized case.Step 6. Then optimize splits, cycle length, network cycle length and offsets (in this order) of the optimized case file. Write down the values of cycle length, splits, and offsets. Then, get a summary of MOEs. Make sure you use the same MOEs you selected for comparison in a previous step.Step 7. Run SimTraffic on the existing case, optimized case, and no-offset case. Do you see visually any noticeable changes? SimTraffic 7 can run multiple different files simultaneously to compare! It’s a great improvement! See them side by side simultaneously the traffic flows in the two cases.Step 8. Compare the results of the existing case and the optimized case in terms of the MOEs you selected, like LOS, intersection v/c, number of stops, queue size, etc., using the outputs from Synchro. (Since this is not a simulation class, you do not need outputs from SimTraffic. We use SimTraffic just to check if the inputs are correct and how the system is performing visually.)Step 9. Write a technical report discussing the background, description of the study site, study methodology, results (comparing the existing case and the optimized case), discussions on results, conclusions and recommendations, references, and appendices(if any). The number of pages of the report will be between 7 to 8 pages (8 pages maximum, double-spaced, letter size), including main body, tables, figures, and references. Cover, abstract, table of contents, list of figures and list of tables are not part of this max number of pages requirement. Appendix may have as many pages asyou think necessary. Write a kind of quality report that you can show to your potential employer, containing: Cover, Abstract, Table of Contents, List of Tables, List of Figures, Main Body (including references), References and

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