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“Diverging diamond interchange” may be coming to SE Wis.

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MILWAUKEE (WITI) -- The Wisconsin Department of Transportation (WisDOT) is looking at redoing a stretch of road near I-43 and Brown Deer Road -- which would make the area look very different.

WisDOT is considering what is called a "diverging diamond interchange" -- a design used in other states, but virtually new to Wisconsin.

"It's high-capacity. It allows for a high traffic volume in that intersection. Brown Deer Road obviously, with people going and linking onto I-43 from there, even getting off I-43, it's one reason we've decided that's one way to go," said Brian DeNeve, spokesman for WisDOT.

The design requires drivers to, essentially, cut over to the other side of the road before cutting back. Experts say it's a lot like a one way street. The diverging diamond interchange is also considered safer than the standard diamond.

"As long as they're following the flow of traffic and there are lane markings, there's also a concrete barrier that divides which road they need to be on, as well as stop lights they follow. It shouldn't be that hard to navigate for any driver," said DeNeve. "The advantage of DDI's is since it's not such a steep turning radius, larger vehicles can negotiate them a lot better."

The new design is currently in the corridor study phase with a goal of starting construction around 2020. The next step in the process is discussing the proposal at public meetings in April and May.

For more information on the project, CLICK HERE.


  • Dennis

    I have been involved in transportation “on the road” for the better part of 33 years. What nut bag thought this up? The same bunch of idiots that think roundabouts need to be placed everywhere?

    Anytime a roadway deviates from being straight, it increases the chances of an collision. Besides – this is Wisconsin and the roads don’t always afford the best traction.

    As far as I’m concerned, ideas like this are an argument to legalize marijuana. We need an alternative to LSD, PCP and cocaine in the highway engineer’s offices.

  • steve etheredge

    whoever thought of this idea should be beat about the head and shoulders until some sense is knocked into him. less accidents? doubtful. follow the lanes. fine for some, for others it will be a bit more difficult. as for the lights – we all know people blow through red lights all the time. less accidents? just don’t see it. lunatics! that’s what I think.

    • Alex

      You’re right. We should get rid of all red lights then. Everyone is at such great risk with them around.

  • Alex

    Ahhh love seeing the comments from the ignorant.

    Change that I my little mind can’t wrap around…it must be bad!

  • Steven MacArthur

    For all of you about to have cranial implosions trying to understand this: basically, these work by making sure that traffic never has to cross oncoming traffic to exit from one road to the other; it essentially does the same thing as the current “cloverleaf” design that is currently at the Brown Deer Road interchange…if you know anybody that lives in the St. Louis metro area, talk to them and get their opinion(s) about this design; MoDOT has installed a lot of these in that area. In my opinion -and I am in my 25th year of being a Commercial Driver, if experience counts for anything anymore- these are a lot better use of highway money that those roundabouts!

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