Interesting traffic flow solution.

They’re called “Continuous Flow Intersections” and an engineering firm ABMB has a flash video showing how it works, a description of it here, and traffic models comparing a CFI intersection with a “normal” intersection here. These folks designed such an intersection in Baton Rouge which opened in March of this year. It’s a pretty interesting idea, though it seems like it might be hard to implement at certain existing intersections, nevertheless, it deserves a serious look.

Hat Tip: Gwinnett Forum


  1. Big Mack says:

    The south Georgia clodhoppers and illegal aliens will never master this intersection. If you hear that some of these are going to be constructed, please post their locations on PP. I want to put in a wrecker service close by and make my fortune. Maybe a law office too.

  2. bird says:

    That is an interesting idea, and it would probably be of value in certain places. The big drawback though is this plan completely destroys walkability. As no one would want to cross this behemoth, it would take a care to even go across the street. Now, no one would want to cross Cobb Pkwy at Windy Hill or parts of Jimmy Carter Blvd. anyway, so this might only help.

    In dense areas and communities, roundabouts might be a better option. See Emory Village renovations.

  3. RonaldJFehr says:

    Seems like Round-a-Bouts would be much easier.

    Or, traffic lights with much better sensers that didn’t waste too much time on left turns or minor ancillary streets. Nothing more frustrating than sitting at a red light when there are no cars moving through the intersection.

    My two cents.

  4. Demonbeck says:

    TX 183 in Austin has some pretty interesting intersections that allow traffic to continue moving. GDOT would do well to look at their ideas.

  5. duluthmom says:

    When we lived in New Jersey (the most densely populated state) most of the turnabouts (called circles there) were being eliminated due to safety concerns. On high traffic roadways, they were replaced with jug handles which directed anyone who needed to go left, to the far right lane, which looped you into the right lane of the intersecting road. While it didn’t eliminate all the gridlock, it definitely eased a lot of the problems.

  6. techtrack says:

    this looks pretty similar to the jersey jug handles, i’ve traveled a lot in the north east and the circles are a pain. the jug handles work pretty well.

  7. Bull Moose says:

    GDOT is still trying to finish the Eisenhower Insterstate System, they don’t have time for innovation…

  8. RiverRat says:

    Single-Point Urban Interchange, aka SPUI (“spoo-ey”) has a greater capacity and more compact shape than traditional interchanges, but is more expensive because it requires larger bridges. It has only one light in the center of the interchange instead of the typical two at either side of the freeway – this allows quicker of traffic flow in larger capacity.

    Still doesn’t do much to help with pedestrians, but another interesting design that is out there which handles traffic at a greater capacity.

  9. RiverRat says:

    although I see now that the continuous flow intersection is for single-level intersections, and not overpasses. So a SPUI is not used in the same situation.

  10. Dorabill says:

    How about a statewide ignore the red arrow day? I’ve driven in the Northeast. It’s like a police state. Concrete barricades with chain link fences on top, dividers, special lanes for this and that, concrete islands, wierd looptie loops. If they had their way everyone would have a rail under their car like the model T course for kids at Six Flags.

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