Alternative Intersection Design and Selection (2020) / Chapter Skim
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51 Case Examples This chapter presents case examples of alternative intersection design and selection for six states (Figure 44) : Alabama, Georgia, Indiana, Minnesota, Missouri, and Texas.
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52 Alternative Intersection Design and Selection State Method Used for Selection of Alternative Intersections Basis for Selection as Case Example Project Highlight Alabama Project by project Emerging use of alternative intersections In process of developing ICE policy Superstreet (signalized) Georgia ICE Customized ICE tool Agency team for alternative intersections Panel member state Roundabout Indiana ICE Intersection Decision Guide (IDG)
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Case Examples 53 Alabama General Approach to Alternative Intersections Alabama began implementing alternative intersections after seeing them successfully implemented in other states such as Georgia. In addition, stakeholders also gained experience from using alternative intersections in other states, which helped Alabama overcome initial public resistance.
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54 Alternative Intersection Design and Selection Project Highlight: SR-182 Superstreet in Orange Beach, Alabama A 2-mile section of SR-182 in Orange Beach, Alabama, was converted from a five-lane section to a superstreet, and construction for the project was completed in 2018. The previous five-lane section experienced 224 crashes between 2012 and 2014, and the corridor includes frequent driveways and side streets (Alabama DOT n.d.b)
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Case Examples 55 Georgia General Approach to Alternative Intersections Georgia developed an ICE policy (Georgia DOT 2017) , which took effect on July 1, 2017.
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56 Alternative Intersection Design and Selection Challenges to Implementation Much of the public resistance encountered in Georgia centers around unfamiliarity, the re-routing of traffic, and changes in traffic behavior. DDI projects were often initiated from local agencies, and thus they garnered more initial public support.
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Case Examples 57 did not meet signal warrants because of low traffic volumes on all approaches. A draft in- service review of the roundabout by Georgia found that all legs are performing at level of service A (LOS A)
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58 Alternative Intersection Design and Selection The scope of the project included relocation of the intersection, installation of a cul-de-sac, culvert extension, and concrete side barrier wall. Two other alternatives were considered: widening SR 154 and moving the intersection to the north as a TWSC intersection while removing the fifth leg.
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Case Examples 59 hybrids are currently either programmed or in the design stage. The CFI/MUT hybrids were created to address the constraint of close proximity to interchanges that precludes the use of a U-turn opening on both sides of the intersection.
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60 Alternative Intersection Design and Selection In addition, Indiana would like to enhance its processes to incorporate considerations for bicyclists and pedestrians at alternative intersections. Other opportunities for growth in Indiana with respect to its alternative intersection practices include greater incorporation of corridor considerations and creating a more responsive and interactive decision guide (Steckler 2018)
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Case Examples 61 Minnesota General Approach to Alternative Intersections Minnesota implemented its first ICE Policy in 2007 and revised its ICE Policy Manual in 2017 (Minnesota DOT 2017a)
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62 Alternative Intersection Design and Selection Other challenges as described by Minnesota in its implementation of alternative intersections include high cost for some alternative intersection projects, finding ways to accommodate bicyclists and pedestrians (especially at roundabouts) , and the potential for sideswipe crashes at multilane roundabouts.
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Case Examples 63 Missouri General Approach to Alternative Intersections Although Missouri does not currently have an ICE policy, it frequently considers alternative intersections as cost-effective ways to improve safety and operations. Missouri often identifies alternative intersection configurations as solutions to problems that cannot be addressed by conventional intersections.
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64 Alternative Intersection Design and Selection a multilane roundabout is used at the other site (US-51 at SR-291S)
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Case Examples 65 Project Highlight: I-35 at SR-152 in Kansas City, Missouri (Displaced Left-Turn Interchange) A displaced left-turn interchange was under construction at I-35 and SR-152 in Kansas City in 2019 (Figure 55)
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66 Alternative Intersection Design and Selection Challenges to Implementation In Texas' experience, public reaction to alternative intersections has mostly been positive. The public is generally supportive of projects that address big problems.
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Case Examples 67 Texas plans to perform some evaluations of this CFI in the future, but has been pleased with its performance in the short time it has been open to traffic. Texas encountered several challenges during the design and implementation of this CFI.
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