Road User Understanding of Bicycle Signal Faces on Traffic Signals (2020) / Chapter Skim
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Pages 49-67
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CHAPTER 4 Key Agency Interviews The objective of conducting agency interviews was to interview key agency staff to gain insights about the challenges in the design and placement of bicycle signal faces to mitigate road user (driver and bicyclist) confusion.
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Table 9. Summary of Interviewed Agencies Agency Name Type Agency Name Type Caltrans State DOT City of Chicago, IL City Delaware DOT State DOT City of Denver, CO City District of Columbia DOT State DOT City of Lincoln, NE City Maryland SHA State DOT City of Minneapolis, MN City Minnesota DOT State DOT City of Seattle, WA City Oregon DOT State DOT Houston Public Works, TX City Hennepin County, MN County Los Angeles DOT, CA City City of Akron, OH City New York City DOT, NY City City of Atlanta, GA City Portland Bureau of Transportation, OR City City of Austin, TX City City San Francisco Municipal Transportation City of Cambridge, MA City Agency, CA Interview Results A summary of the responses for each question is summarized in the following sections.
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Road User Understanding Question 2: Have you received public comments or feedback about driver confusion with the bicycle symbol face? Nearly half of the respondents (48%, n=10)
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intersection. They noted that if it were a more standard intersection, a bicycle signal would not be needed.
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Table 13. Experience with Bicycle/Motor Vehicle Crashes Response # of Agencies*
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various reasons (agency policy, agency practice, concerns about acquiring/maintaining more than one signal head size)
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Table 16. Research Needed, Improved Conspicuity of Symbol Face Response # of Agencies*
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Table 18. Use of Visibility-Restriction Devices Response # of Agencies Yes 7 No 13 Not Applicable 1 Placement of the Bicycle Signal Face Question 10: Do you have any experience with 4-inch near-side bicycle signal faces?
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required by the interim approval, although they try to do so whenever possible. Another agency stated that when considering a new bicycle signal installation, they are faced with the choice of a more seamless process by following the IA-16 requirements or a more arduous process by using an RTE with the design they feel is most appropriate.
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encroachment creating some discomfort. Another informally observed bicyclist signal compliance and found that some comply with the signal, while others do not.
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challenges in installing the sign. Two agencies mentioned issues or concerns about the additional wind load presented by the sign on mast arm installations.
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where the signal housing and backplate are distinctly different, and while they don't have concrete data, they feel that using a different color makes the bicycle signals stand out. Another agency noted that they have recently implemented this type of design and are collecting data.
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Table 27. Research Needed, Differentiate Bicycle Signals Response # of Agencies Yes 14 No 5 Monitor 1 No opinion 1 Question 18: Has IA-16's requirement that "bike signals shall be limited to situations where bicycles moving on a green or yellow signal indication in a bicycle signal face are not in conflict with any simultaneous motor vehicle movement" impacted how many bike signals you have installed?
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Table 29. Vehicle Movements Restricted During Bicycle Green Response # of Agencies Yes 18 No 1 Not Applicable 2 Table 30.
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Question 20: Do you think the person on a bicycle expects to have an exclusive movement on a green bicycle symbol? The opinions of the agencies interviewed were split on whether the person on a bicycle expects to have an exclusive movement on a green bicycle symbol (Yes, n=9; No, n=7)
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Do you think there are issues with concurrent green vehicle and bicycle signal faces? As a follow-up, the majority of agencies (62%, n=13)
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Table 36. Plans to Use Arrows with Bicycle Symbols Response # of Agencies Yes 2 No 16 Maybe 3 Question 23: Are you using yellow change or red clearance intervals for bicycle signal phases?
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Research Ideas Question 24: Please give us your assessment from 1=low priority to 5=highest priority of the following potential research topics: Appropriate traffic control devices to communicate to a person on a bicycle that their movement is permissive or has conflicts emerged as the top research topic with the highest average score and highest number of five priority rankings, as seen in Table 39. Heterogeneity among existing bicycle signal installations underscores this need.
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• Thresholds for bicycle signal warrants and associated criteria. • Criteria for the use of near-side 4-inch indication and associated benefits (if any)
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