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Case Study 1 Styner/Lauder Intersection Moscow, Idaho

Analyzing the conversion of U.S. 95 and Styner/Lauder intersection to signal control for improved traffic flow and safety in Moscow, Idaho. Learn HCM analysis procedures and interpretation of results. Consider various factors such as level of service and future traffic projections.

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Case Study 1 Styner/Lauder Intersection Moscow, Idaho

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  1. Case Study 1Styner/Lauder IntersectionMoscow, Idaho

  2. Overview SH 8 US 95 Sweet Lauder Styner ? Problem: Should the intersection of U.S. 95 and Styner/Lauder be converted from two way stop control to signal control? Learning skills: • Apply HCM analysis procedures for interrupted flow facilities. • Know common input requirements and default values. • Select an appropriate analysis procedure • Understand HCM analysis limitations • Know how to reasonably interpret the results

  3. Introduction • Moscow’s population is about 21,000 • U.S. 95 is the primary north-south state highway in Idaho • ADT on U.S. 95 is between 15,000 and 23,000 vpd • Average annual traffic growth is about two percent per year

  4. Introduction

  5. Introduction SH 8 Sweet Lauder SH 8 US 95 Sweet Lauder Styner

  6. Introduction • City residents have asserted that increasing traffic volumes at the intersections of Styner Avenue, Lauder Avenue, and U.S. 95 are increasing delays for and reducing the safety of motorists traveling through the intersection. • The city has requested that the Idaho Transportation Department signalize the intersection. • What issues do you think should be considered by the state's traffic engineer in resolving this problem? • What issues do you think should be considered by the state's traffic engineer in resolving this problem?

  7. Getting Started Issues to consider • Scope of the analysis? • Stakeholders? • Goals? • Performance measures? • Tools? • Data? • Technical Issues?

  8. Problem 1 U.S. 95/Styner-Lauder Avenue US 95 Lauder Styner Questions to be Answered: • What is the level of service at the existing TWSC intersection at U.S. 95/Styner-Lauder? • What would the level of service be if the intersection were signal controlled? • What would the level of service be at the intersection under future projected traffic conditions?

  9. Problem 1 U.S. 95/Styner-Lauder Avenue US 95 Lauder Styner Analyses to be Undertaken: • Sub-problem 1a. Analysis of the existing TWSC intersection • Sub-problem 1b. Analysis of the proposed signalized intersection • Sub-problem 1c. Analysis of future conditions

  10. Sub-Problem 1a Analysis of existing TWSC intersection US 95 Lauder Styner Step 1. Setup: analysis of existing TWSC • Which tool or tools from the HCM should be used for the analysis of a TWSC intersection? • What data are required for the analysis? • What default values should be used? • What time periods should be analyzed? • What measure should be used to determine the performance of the intersection? • What other factors should be considered?

  11. Sub-Problem 1a Analysis of existing TWSC intersection Run US 95 Lauder Styner

  12. Sub-Problem 1a Analysis of existing TWSC intersection Step 2. Results

  13. Sub-Problem 1a Analysis of existing TWSC intersection Step 2. Results (cont.)

  14. Sub-Problem 1a Analysis of existing TWSC intersection Step 2. Results (cont.) Intersection delay and LOS?

  15. Sub-Problem 1b Analysis of proposed signalized intersection Run US 95 Lauder Styner Step 1. Setup: analysis of signal control • Which tool or tools should be used for this analysis? • What data are required for the analysis? • What default values should be used? • What time periods should be analyzed? • How do we construct a signal timing for a proposed traffic signal using the HCM?

  16. Sub-Problem 1b Analysis of proposed signalized intersection Step 2. Results

  17. Sub-Problem 1c Analysis of future conditions Run US 95 Lauder Styner Step 1. Setup: analysis of future conditions • What is the appropriate future year for this analysis? • Which default values should be used for this future analysis? • What other factors should be considered?

  18. Sub-Problem 1c Analysis of future conditions Today 27.6 80.9 Future 115 Step 2. Results for TWSC control

  19. Sub-Problem 1c Analysis of future conditions Step 2. Results for signal control

  20. Sub-Problem 1c Analysis of future conditions What if our volume assumptions are uncertain?

  21. Sub-Problem 1c Analysis of future conditions Graphical presentation of results

  22. Sub-Problem 1c Analysis of future conditions Graphical presentation of results

  23. Problem 1 Analysis

  24. Problem 1 Discussion

  25. End of Problem 1

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