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Suggested Citation:"Appendix A. Survey Questions." National Academies of Sciences, Engineering, and Medicine. 2021. Application of Crash Modification Factors for Access Management, Volume 2: Research Overview. Washington, DC: The National Academies Press. doi: 10.17226/26162.
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Page 213
Page 214
Suggested Citation:"Appendix A. Survey Questions." National Academies of Sciences, Engineering, and Medicine. 2021. Application of Crash Modification Factors for Access Management, Volume 2: Research Overview. Washington, DC: The National Academies Press. doi: 10.17226/26162.
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Page 214

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A-1 A P P E N D I X A Survey Questions 1. Do you quantify the safety effects of access management strategies to support related decisions? a. Yes b. No 2. Do you have a policy or procedure for assessing the safety effects of access management strategies? a. Yes b. No 3. Do you track safety-related performance measures after implementing access management strategies? a. Yes b. No 4. What are your priority needs to estimate the safety effects of individual access management strategies or combinations of strategies? (Please prioritize as 1 or 2 with 1 being the higher priority) a. Safety effects of individual strategies (e.g., relocate driveway, close median opening) b. Safety effects of combination strategies (e.g., install non-traversable median and consolidate driveways along a corridor) 5. What are your priority needs in terms of the level of analysis? (Please prioritize as 1, 2, or 3 with 1 being the highest priority) a. Site (e.g., modify design of individual driveways or turn lanes, install isolated medians) b. Intersection (e.g., establish corner clearance criteria, install left-turn lanes, convert to roundabout, convert to restricted crossing U-turn) c. Corridor (e.g., manage location and spacing of access points, install medians, convert undivided to TWLTLs) 6. What are your priority needs in terms of access management strategies? (Please prioritize each of the following strategies as 1, 2, or 3 with 1 being the highest priority) a. Alternative intersection and interchange design EXAMPLE: Install roundabout, install superstreet (RCUT, J-Turn), provide median acceleration lane b. Control driveway design elements EXAMPLE: Change movement restriction, require appropriate return radii, throat width, etc. for the type of traffic to be served c. Control intersection design elements EXAMPLE: Control turning radius d. Convert two-way streets to one-way operation EXAMPLE: Reduce potential conflicts and turning movements e. Establish corner clearance criteria EXAMPLE: Remove/relocate driveways within functional area of signalized intersections f. Improve cross-connectivity EXAMPLE: Allow vehicles to access adjacent properties without returning to the mainline g. Install continuous two-way left-turn lane (TWLTL) on undivided highway EXAMPLE: Implement road diet and non-road diet scenarios h. Install left-turn lanes EXAMPLE: Install left-turn lanes, channelize left-turn lanes i. Install non-traversable medians, and accommodate left-turns and U-turns EXAMPLE: Convert undivided highway, TWLTL, or traversable median (non-TWLTL) to non- traversable median; install isolated median barriers

A-2 j. Install right-turn lanes EXAMPLE: Install right-turn lanes, channelize right -turn lanes, improve design elements of right-turn lanes k. Install service or frontage roads EXAMPLE: Install frontage road to provide access to parcels l. Manage location and spacing of unsignalized access EXAMPLE: Establish maximum driveway density, establish minimum driveway spacing, consolidate driveways m. Manage spacing of traffic signals EXAMPLE: Establish traffic signal spacing criteria n. Manage location, spacing, and design of median openings and crossovers EXAMPLE: Regulate median opening density and spacing, replace full median opening with directional median opening, install U-turns as alternative to direct lefts o. Manage the spacing of signalized and unsignalized access on crossroads in the vicinity of freeway interchanges EXAMPLE: Establish spacing criteria between interchange ramp terminals or between ramp terminals and adjacent driveways or intersections p. Provide adequate sight distance at access points EXAMPLE: Manage vegetation to improve sight distance, manage design elements to improve sight distance 7. Are there other access management strategies or combination(s) of strategies that should be prioritized in this project? 8. Yes 9. No 10. May we follow-up with you for additional information? If yes, please provide the following information: 11. Name, organization, email, phone 12. Is there someone else in your organization you’d like to refer us to for additional information? If yes, please provide the following information: 13. Name, organization, email, phone 14. Comment

Next: Appendix B. Comments on Survey Responses »
Application of Crash Modification Factors for Access Management, Volume 2: Research Overview Get This Book
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The 1st Edition, in 2010, of the AASHTO Highway Safety Manual revolutionized the transportation engineering practice by providing crash modification factors and functions, along with methods that use safety performance functions for estimating the number of crashes within a corridor, subsequent to implementing safety countermeasures.

The TRB National Cooperative Highway Research Program's pre-publication draft ofNCHRP Research Report 974: Application of Crash Modification Factors for Access Management, Volume 2: Research Overview documents the research process related to access management features.

Supplementary to the report is the pre-publication draft of NCHRP Research Report 974: Application of Crash Modification Factors for Access Management, Volume 1: Practitioner’s Guide and a summary presentation for the two volumes.

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