Guidelines for Selection of Speed Reduction Treatments at High-Speed Intersections: Supplement to NCHRP Report 613 (2008)

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APPENDIX C

SURVEY ON HIGHWAY AGENCY USE OF SPEED-REDUCTION TREATMENTS ON INTERSECTION APPROACHES The National Cooperative Highway Research Program (NCHRP) is conducting research in NCHRP Project 3-74 to investigate the effectiveness of treatments to reduce vehicle speeds at intersection approaches, where needed. NCHRP is sponsored by the Federal Highway Administration (FHWA) and the American Association of State Highway and Transportation Officials (AASHTO) and is managed by the Transportation Research Board (TRB). Kittelson & Associates, Inc. and Midwest Research Institute are conducting the research in NCHRP Project 3-74. The following questionnaire is seeking information on your agency’s experience and current practices in employing speed-reduction treatments on approaches to at-grade intersections. There will be an opportunity for interested highway agencies to participate in the research. The research results will be available for utilization by all highway agencies. Your assistance in taking a few minutes to respond to this questionnaire would be greatly appreciated. 1. What type of highway agency do you represent (check one)? ___ State highway agency ___ City highway agency ___ County highway agency ___ Other (please describe): 2. Does your agency incorporate geometric treatments specifically intended to reduce speeds on approaches to at-grade intersections? ___ YES ___ NO If YES, please indicate which of the following geometric treatments have been used by your agency and indicate whether your agency considers the treatment to be effective (i.e., would you use them again?): Effective? In current use? (YES / NO) (YES / NO) ____ Reduced lane widths (lane width narrower than ________ ________ upstream midblock roadway) ____ Shoulder treatments ________ ________ ____ Speed tables ________ ________ ____ Rumble strips in the traveled way on intersection ________ ________ approaches ____ Roundabouts ________ ________ ____ Introduction of horizontal curvature on approaches to ________ ________ conventional at-grade intersections ____ Introduction of reverse horizontal curvature ________ ________ (successive curves in opposing directions) on approaches to conventional at-grade intersections ____ Introduction of other roundabout-like treatments on ________ ________ approaches to conventional at-grade intersections ____ Roadside treatments such as cross-sectional changes, ________ ________ “gateways”, or landscaping ____ Other (please describe): ________________________ ________ ________ ____________________________________________ NCHRP Project 3-74 (10/13/04) 1

3. Does your agency use signing (i.e., STOP signs or other messages), other than posted speed limits or advisory speed signs, specifically intended to reduce speeds on approaches to at-grade intersections? ___ YES ___ NO If YES, please indicate which of the following signing treatments have been used by your agency and indicate whether your agency considers the treatment to be successful (i.e., would you use them again?): Effective? In current use? (YES / NO) (YES / NO) ____ Dynamic warning signs activated by speed of ________ ________ approaching vehicle ____ Dynamic warning signs activated by potentially ________ ________ conflicting vehicles on another approach to the same intersection ____ Other (please describe): ________________________ ________ ________ ____________________________________________ 4. Does your agency use pavement markings specifically intended to reduce speeds on approaches to at- grade intersections? ___ YES ___ NO If YES, please indicate which of the following pavement marking treatments have been used by your agency and indicate whether your agency considers the treatment to be successful (i.e., would you use them again?): Effective? In current use? (YES / NO) (YES / NO) ____ Wider edge line markings ________ ________ ____ Wider centerline markings ________ ________ ____ Transverse pavement markings on the roadway ________ ________ ____ Transverse pavement markings on the shoulder ________ ________ ____ Other (please describe): ________________________ ________ ________ ____________________________________________ 5. If your agency has design policies, traffic control policies, specifications, or typical drawings for the speed-reduction treatments you identified in your response to Questions 2, 3 and 4, a copy of the policies, specifications, or typical drawings would be appreciated. Material can be emailed or sent to Ingrid Potts (contact information listed at end of survey). 6. Has your agency conducted formal research or performed evaluations to determine the effects on vehicle speeds or safety of the treatments you identified in Questions 2, 3, and 4? ___ YES ___NO If YES, please describe the research or attach a copy of the research or evaluation report: NCHRP Project 3-74 (10/13/04) 2

7. NCHRP Project 3-74 is considering the conduct of evaluations to determine the effectiveness of selected intersection speed-reduction treatments like those mentioned in Questions 2, 3, and 4. For each treatment on the following list, please rate the potential importance to your agency of obtaining the results of a formal effectiveness evaluation. Please rate each treatment on a 1 to 5 scale with 5 meaning “greatest need for evaluation” and 1 meaning “least need for evaluation”. ____ Reduced lane widths (lane width narrower than adjacent midblock roadway) ____ Shoulder treatments ____ Speed tables ____ Rumble strips in the traveled way on intersection approaches ____ Roundabouts ____ Introduction of horizontal curvature on approaches to conventional at-grade intersections ____ Introduction of reverse horizontal curvature (curves in opposing directions) on approaches to conventional at-grade intersections ____ Introduction of other roundabout-like treatments on approaches to conventional at-grade intersections ____ Roadside treatments such as cross-sectional changes, “gateways”, or landscaping ____ Wider edge line markings ____ Wider centerline markings ____ Transverse pavement markings on the roadway ____ Transverse pavement markings on the shoulder ____ Dynamic warning signs activated by speed of approaching vehicle ____ Dynamic warning signs activated by potentially conflicting vehicles on another approach to the same intersection ____ Other (please describe): 8. In order to determine the effectiveness of selected intersection speed-reduction treatments, the research may consider the following evaluation criteria (listed below). Please rate the importance of including each criterion in the evaluation, based on your agency’s potential need for evaluation results incorporating that criterion. Please rate each criterion on a 1 to 5 scale with 5 meaning “very important” and 1 meaning “not important” to your agency’s needs. ____ Vehicle speed profile (midblock speed vs. intersection approach speed) ____ Mean or 85th percentile vehicle speed before vs. after treatment ____ Vehicle lateral position ____ Accident frequency or severity (before vs. after treatment) 9. Are there additional evaluation criteria that your agency considers important to include in the evaluation of speed-reduction treatments on intersection approaches? ___ YES ___ NO If YES, please describe: 10. Has your agency installed speed-reduction treatments on existing intersection approaches in the last three years that you would be willing to have included in an effectiveness evaluation to be conducted by the NCHRP Project 3-74 research team? ___ YES ___ NO If YES, please indicate the type of treatments installed and the approximate number of projects: NCHRP Project 3-74 (10/13/04) 3

11. Would your agency be interested in participating in an effectiveness evaluation of speed-reduction treatments on intersection approaches to be installed in 2005? Such an evaluation would be conducted by the NCHRP Project 3-74 research team. ___ YES ___NO If YES, please identify the type of treatments your agency might consider implementing: ____ Reduced lane widths (lane width narrower than adjacent midblock roadway) ____ Shoulder treatments ____ Speed tables ____ Rumble strips in the traveled way on intersection approaches ____ Roundabouts ____ Introduction of horizontal curvature on approaches to conventional at-grade intersections ____ Introduction of reverse horizontal curvature (curves in opposing directions) on approaches to conventional at-grade intersections ____ Introduction of other roundabout-like treatments on approaches to conventional at-grade intersections ____ Roadside treatments such as cross-sectional changes, “gateways”, or landscaping ____ Wider edge line markings ____ Wider centerline markings ____ Transverse pavement markings on the roadway ____ Transverse pavement markings on the shoulder ____ Dynamic warning signs activated by speed of approaching vehicle ____ Dynamic warning signs activated by potentially conflicting vehicles on another approach to the same intersection ____ Other (please describe): 12. Do you have any other comments? 13. May we have the name of an individual in your agency that we may contact for further information? Name _____________________________________ Agency _____________________________________ Address _____________________________________ _____________________________________ _____________________________________ Phone: ___________________ Fax: _____________ E-mail: _______________________________________ 14. Are there other agencies in your state, including cities and counties, that you think might have an interest in participating in an effectiveness evaluation of speed-reduction treatments on approaches to at- grade intersections. ___ YES ___ NO If YES, please provide the name of the agency and/or contact information for a key individual: NCHRP Project 3-74 (10/13/04) 4

THANK YOU FOR YOUR ASSISTANCE. Please mail your response by October 29, 2004, to: Ms. Ingrid B. Potts Senior Traffic Engineer Midwest Research Institute 425 Volker Boulevard Kansas City, MO 64110 Phone: (816) 753-7600, Ext. 1461 Fax: (816) 561-6557 E-mail: ipotts@mriresearch.org Please feel free to contact Ms. Potts if you have any questions. NCHRP Project 3-74 (10/13/04) 5