Alternative Intersection Design and Selection (2020) / Chapter Skim
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35 Survey Results A survey was developed and administered to gain greater understanding of the state of the practice for alternative intersection design and selection in the United States. The survey was reviewed by the topic panel before being sent to each Department of Transportation (DOT)
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36 Alternative Intersection Design and Selection operation. Seventy-one percent of DOTs reported having at least one SPDI open and operational, and approximately two-thirds of the DOTs have at least one DDI in operation.
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Survey Results 37 (Map created with mapchart.net ©) Figure 34.
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38 Alternative Intersection Design and Selection (Map created with mapchart.net ©) Figure 37.
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Survey Results 39 (Total number of respondents = 51) Figure 40.
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40 Alternative Intersection Design and Selection (Total number of respondents = 51) Figure 41.
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Survey Results 41 operational (Group A) , and the 33 DOTs with more than 10 roundabouts open and operational (Group B)
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42 Alternative Intersection Design and Selection Considerations for Alternative Intersections The results for the question regarding factors considered in intersection type selection are shown in Table 7. Traffic capacity was the factor most often considered with 78% of DOTs reporting that this factor is always or almost always taken into account.
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Survey Results 43 Q6. How strongly do you agree or disagree that the following concerns have hindered your agency's efforts to implement alternative intersection designs?
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44 Alternative Intersection Design and Selection Policies and Guidance for Alternative Intersections Questions 8 and 9 sought to understand the guidelines or criteria developed by DOTs to aid in the implementation of alternative intersection design. The results in Table 12 show that 37% of DOTs responded they had used or developed documented policies, procedures, or guidelines for intersection type selection.
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Survey Results 45 Q6. How strongly do you agree or disagree that the following concerns have hindered your agency's efforts to implement alternative intersection designs?
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46 Alternative Intersection Design and Selection Q9. Has your agency developed any design criteria, analysis criteria, or construction details (including details for signing, marking, and lighting)
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Survey Results 47 Q12. Does your agency have special in-house engineers or consultants review projects for the following types of alternative intersections/interchanges?
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48 Alternative Intersection Design and Selection (Total number of respondents = 51) Figure 43.
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Survey Results 49 Other Survey Feedback Questions 16 and 17 concluded the survey by inquiring into agencies' interest in participating in a case example and asking for any other general feedback. As shown in Table 19, 35% of DOTs indicated that they would be interested in participating in a case example.
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50 Alternative Intersection Design and Selection • Some DOTs are not likely to consider SPDIs in the future due to concerns about construction issues and maintenance and preferences for other alternative intersection types. • DOTs are generally satisfied with the performance of the alternative intersections under their jurisdiction.
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