Thanks for your input Amy Z , while there aren’t an increased number of recorded crashes compared to other intersections nearby, this one is by far more difficult and confusing to navigate whether in a car or as a pedestrian/biker given its complexity. After an initial review by some urban planners, we also determined that three circulation lanes would probably be unnecessary; so any final proposal would most likely include two lanes. I would imagine that in any emergency scenario, traffic would behave as normal by veering to the perimeter and stalling to allow emergency vehicles through. This is why we didn’t include raised separations between the Grand River/MLK Jr. single lane ‘turning armpits’ to allow emergency vehicles to pass them while stalled if necessary. We didn’t think of this previously, but a third circulation lane then might make sense as an emergency pullover lane for vehicles within the traffic circle at the time of emergency. These are all important issues to consider which would inform the final design proposal!
Hey Vignesh Swaminathan , Wow this is an amazing study! Was this commissioned by the City of Detroit DOT or something you did on your own? I think the added pedestrian and bike paths are a step in the right direction towards giving those on two legs or two wheels more preference and visibility. My initial concerns are the number of added potential pedestrian/vehicle and bike/vehicle collision points with the increased crosswalks and bike paths. Our aim in proposing a roundabout is meant to improve both vehicular flow and pedestrian/biker safety equally. While I think a modified intersection like this might improve the latter, I’m not sure about the former. Regardless, we need to look at every option because the solution probably lies somewhere in between. Shoot me an email at firstname.lastname@example.org so I have your info, we could definitely use your help!
Joshua Maddox We definitely agree that there should be a more direct route through the intersection when headed South on Trumbull. The most difficult part of a redesign will be how to accommodate all six points of the intersection equally, given that they don't meet at one single point. In an initial design, we played with the idea of presenting a 'traffic oval' that is more elliptical and would elongate along Grand River, to present an equal point of access at Trumbull to the North. We ultimately ended up proposing a perfect circle configuration for this initial phase because people are more familiar with it as a concept. The actual design would evolve over the next year with valuable feedback like yours!