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Center for Advanced Transportation Education and Research University of Nevada, Reno Student Paper Yue Zhao Guideline for Marked and Unmarked Pedestrian.

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Presentation on theme: "Center for Advanced Transportation Education and Research University of Nevada, Reno Student Paper Yue Zhao Guideline for Marked and Unmarked Pedestrian."— Presentation transcript:

1 Center for Advanced Transportation Education and Research University of Nevada, Reno Student Paper Yue Zhao Guideline for Marked and Unmarked Pedestrian Crosswalks at Unsignalized Intersections LAURA ZHAO Graduate Research Assistant Center for Advanced Transportation Education and Research Department of Civil & Environmental Engineering University of Nevada, Reno 1

2 Center for Advanced Transportation Education and Research University of Nevada, Reno Student Paper Yue Zhao Outline Background Background Guideline Development Guideline Development Case Study Case Study Conclusions Conclusions 2

3 Center for Advanced Transportation Education and Research University of Nevada, Reno Student Paper Yue Zhao 3Background Typical Marked and Unmarked Crosswalks at TWSC Intersections Marked Crosswalks Increase pedestrian MOBILITYIncrease pedestrian MOBILITY With perhaps a deceived sense of SECURITYWith perhaps a deceived sense of SECURITY With HIGHER pedestrian crash rates (e.g. California, Florida, and Texas.)With HIGHER pedestrian crash rates (e.g. California, Florida, and Texas.) UnMarked Crosswalks With no clear PATH for pedestrianWith no clear PATH for pedestrian With no specific WARNING for driverWith no specific WARNING for driver With LOWER pedestrian crash ratesWith LOWER pedestrian crash rates

4 Center for Advanced Transportation Education and Research University of Nevada, Reno Student Paper Yue Zhao 4Background Critical issues Whether crosswalk should be marked or not?Whether crosswalk should be marked or not? Under what conditions marked crosswalks should be used?Under what conditions marked crosswalks should be used? Geometry Characteristics Pedestrian Demand Accident Occurrence Mark vs. Unmark?

5 Center for Advanced Transportation Education and Research University of Nevada, Reno Student Paper Yue Zhao 5Background Existing Guidelines Qualitative statement; Single dominate factor; Flowchart; e.g. MUTCD, FHWA etc.Qualitative statement; Single dominate factor; Flowchart; e.g. MUTCD, FHWA etc. Major Issue: lack a balanced consideration and interpretation of all potential impact factors.Major Issue: lack a balanced consideration and interpretation of all potential impact factors. Objectives: Develop a guideline to assist decision making, i.e. help determine the installation of marked crosswalkDevelop a guideline to assist decision making, i.e. help determine the installation of marked crosswalk

6 Center for Advanced Transportation Education and Research University of Nevada, Reno Student Paper Yue Zhao 6 Guideline Development Multi-Criteria Analysis Problem Alternatives: Mark, UnmarkAlternatives: Mark, Unmark Multi-criteria decisive variables: Speed Limit, Number of Travel Lanes etc.Multi-criteria decisive variables: Speed Limit, Number of Travel Lanes etc. Conceptual Guideline Guideline Development Decision Making Process Attain a decision through the combination of impact factors simultaneously.Attain a decision through the combination of impact factors simultaneously.

7 Center for Advanced Transportation Education and Research University of Nevada, Reno Student Paper Yue Zhao 7 Mark/Unmark Choice Tool Inner Computational Engine Combination of PROMETHEE &AHP

8 Center for Advanced Transportation Education and Research University of Nevada, Reno Student Paper Yue Zhao 8 Mark/Unmark Choice Tool

9 Center for Advanced Transportation Education and Research University of Nevada, Reno Student Paper Yue Zhao 9 Case Study 24 unsignalized intersections: 50% marked crosswalks + 50% unmarked crosswalks City of Henderson InputOutputFHWAExisting GLPRCMTNTLSLPVTVGuidelineCrosswalk Horizon Ridge Pkwy & Annet St UnmarkN Burkholder & Cloudcrest MarkPUnmark Anthem & Atchley EJPMark Amador Lane & Hoskins Court UnmarkP Paseo Verd & Bella Vista Apts UnmarkN Green Valley & Paseo Verd MarkC Alexandria & Anthem UnmarkNMark Thunderbay & Sun City Anthem UnmarkC Anthem & Somersworth UnmarkNMark Jada & Solera Sky UnmarkP Millcroft & Clayton UnmarkC Sunset Way & Valle Verde UnmarkPMark High Mesa & Fountain Grove UnmarkC Auto Mall & American Pacific UnmarkN Democracy & Anthem Highlands UnmarkPMark Gibson & Mary Crest UnmarkP Reunion Dr. & Cadence St MarkP American Pacific Dr & Cassia Wy UnmarkN Van Wagenen St & Victory Rd UnmarkNMark Center & Fir MarkCUnmark Wigwam & Grand Legacy MarkP City of Reno InputOutputFHWAExisting GLPRCMTNTLSLPVTVGuidelineCrosswalk W Moana Ln & Smith Dr UnmarkNMark Sutro St & Oliver Ave MarkPUnmark N.Virginia & 17th St EJPUnmark S Virginia St & La Rue Ave MarkP Mark/Unmark Choice Tool FHWA Guideline Existing Crosswalk

10 Center for Advanced Transportation Education and Research University of Nevada, Reno Student Paper Yue Zhao 10 Case Study Phase I: Comparison of Developed Tool Recommendation and Existing Conditions Approximate 72% of all proposals match actual field data. Explanation I: No consideration regarding pedestrian-related crash factor in agencies when the crosswalk was installed. Explanation II: Final preference scores are not divided into absolute two categories, mark and unmark, but the engineering judgment category is highly recommended when the difference between two final scores is less than 20%.

11 Center for Advanced Transportation Education and Research University of Nevada, Reno Student Paper Yue Zhao 11 Case Study Phase II: Comparison of Developed Tool Recommendation and FHWA Guideline 60% of FHWA recommendations confirm actual crosswalk type. 64% of developed tool recommendations met FHWA recommendations. If merely considering combinations of vehicle ADT, speed limit, number of travel lanes and median type which are the core of FHWA guideline, the developed guideline will provide the same results as FHWA guideline. By complementing pedestrian volume, crash data and engineer preference factors, developed tool could accommodate more practical and insightful suggestions pertaining to crosswalk type.

12 Center for Advanced Transportation Education and Research University of Nevada, Reno Student Paper Yue Zhao 12Conclusions Crosswalk marking is a useful traffic control device. It is very important to realize the positive as well as the negative consequences of marking crosswalks. The developed Mark/Unmark Choice Tool can The developed Mark/Unmark Choice Tool can help engineers make sound decisions for the placement of marked crosswalks and interpret the dilemma of crosswalk markings.

13 Center for Advanced Transportation Education and Research University of Nevada, Reno Student Paper Yue Zhao 13 THANKS FOR YOUR TIME


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