How a diverging diamond interchange works

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  • เผยแพร่เมื่อ 21 ก.ย. 2024
  • Travelers follow traffic signals, signs, and lines through the interchange. Carefully designed roadway striping, arrows, and signs direct travelers. See more about this work in Lacey, Washington at I5exit111.com

ความคิดเห็น • 61

  • @desviz
    @desviz 4 ปีที่แล้ว +12

    Good Job WSDOT! Excellent Interchange design! its going to get me quicker to where I have to go! Thank you!

    • @busa89
      @busa89 4 ปีที่แล้ว +2

      It works ok now. Once all the lanes open it should fly. Not sure how long thats going to be though. Seems like the project has been dragging a bit since reopening.

    • @henrystowe6217
      @henrystowe6217 4 หลายเดือนก่อน +3

      How do traffic lights maske this faster?

    • @desviz
      @desviz 4 หลายเดือนก่อน +3

      Traffic moves faster because the left turn light and the through moment light are the same, so left turns and through traffic happen at the same time.

  • @daveshaw4159
    @daveshaw4159 4 ปีที่แล้ว +8

    May try this out at midnight so I have less probability of getting lost and causing an accident.

  • @JoeClarkCinema
    @JoeClarkCinema 4 ปีที่แล้ว +6

    Is WSDOT expected to deploy these super efficient interchanges elsewhere in problem areas in Pierce County and beyond? Gravelly Lake, Bridgeport, 512, 38th and 56th would greatly benefit from a Diverging Diamond. 320th in Federal Way comes to mind as well.

    • @scottmanthey3549
      @scottmanthey3549 4 ปีที่แล้ว +3

      Be careful what you wish for... This has taken over a year so far and has been a mess while they built it. They usually have about 5 guys working on it (with 3 of them supervising) at any given time so I'm assuming they can drag it out another year at least they way they are going.

  • @rubinajo
    @rubinajo 4 ปีที่แล้ว +1

    This used to be one of my favorite exits. Not sure if it still is, as things change like Hawks Prairie Old Fashion Inn with their Roast Beef Hash and Pancakes as big as your HEAD or gas station that changed owners but always had spotless restroom or, across I-5, Fusion Beads, bad for my budget but fantastic for creating beautiful beaded creations.

  • @lucask4330
    @lucask4330 หลายเดือนก่อน

    Makes me think of a diverging diamond, but idk if this functions the same

  • @BillGreenAZ
    @BillGreenAZ 2 หลายเดือนก่อน +1

    So you have to cross traffic twice just to go through the intersection? How is that safer and more efficient?

    • @rafiqstarline
      @rafiqstarline 6 วันที่ผ่านมา

      It's safer then regular interchanges like the Diamond.
      Go research dude

    • @BillGreenAZ
      @BillGreenAZ 5 วันที่ผ่านมา

      ​@@rafiqstarline Do you believe everything you read in "research"? It's not always correct.

    • @rafiqstarline
      @rafiqstarline 5 วันที่ผ่านมา

      @@BillGreenAZ yes I know but if you just look what causes
      that dangerous or not you would have known. The DDI is
      safe because it reduces the amount of crash points.

    • @BillGreenAZ
      @BillGreenAZ 5 วันที่ผ่านมา

      @@rafiqstarline how does it reduce the amount of crash points when traffic is being crossed twice?

    • @rafiqstarline
      @rafiqstarline 5 วันที่ผ่านมา

      @@BillGreenAZ haiya just watch some videos
      for example from Road Guy Rob. Im to lazy to
      explain because in the end you won't understand

  • @taterlysaladman9377
    @taterlysaladman9377 ปีที่แล้ว +16

    why did you ruin it with those two red lights that everyone has to stop and wait at? Just make those both overpasses. Boom. Now you got something that flows. You are welcome.

    • @theseb1979
      @theseb1979 6 หลายเดือนก่อน +12

      Cost

    • @draganraus1976
      @draganraus1976 6 หลายเดือนก่อน +7

      Space

    • @ZackryPaul
      @ZackryPaul 5 หลายเดือนก่อน +9

      Pedestrian crosswalks

    • @coreysmith8560
      @coreysmith8560 4 หลายเดือนก่อน +1

      I think there is that consideration but hasn't been proposed anywhere yet. Good idea though.

    • @jflartner117
      @jflartner117 3 หลายเดือนก่อน +8

      Lol why don't we just make 7 lane roads between all points in the entire world? Boom traffic = 0. You're welcome "engineers."

  • @DL30Creations
    @DL30Creations 2 ปีที่แล้ว +3

    Wait until there is an accident on the freeway that backs up traffic. This layout will make it that much harder to navigate the other road when traffic backs up there as well now. The old way only 1 lane of non freeway traffic was congested. With this method all lanes will become blocked during accidents. Great job designing and planning this one!

    • @emil3458
      @emil3458 6 หลายเดือนก่อน +2

      as if a normal diamond interchange is any better when there is a traffic accident

  • @BASESKIZL
    @BASESKIZL 4 ปีที่แล้ว +1

    You can turn LEFT on red too! Who made this? 46.61.055

    • @kaukospots
      @kaukospots 4 ปีที่แล้ว +8

      You can turn left on red on to a one-way that has the traffic going the same direction. Right in the section you listed.

  • @twarch1978
    @twarch1978 10 หลายเดือนก่อน +7

    The fact that you have to make a tutorial video to explain how it works says a lot.

    • @blakew595
      @blakew595 10 หลายเดือนก่อน +6

      That could make a video at how to stop at a stop sign but people don't understand that logic either.

    • @trwent
      @trwent 5 หลายเดือนก่อน

      ​@@blakew595THAT could make a video?

    • @trwent
      @trwent 5 หลายเดือนก่อน +5

      All it says is that it is something new. People need some time to learn how to use new things.

    • @cobalt789
      @cobalt789 หลายเดือนก่อน

      The tutorial:
      - Stop when the light is red
      - Go when the light is green
      - The design of the intersection is literally that you don't have any opportunities beyond that to screw it up

  • @janshuster1426
    @janshuster1426 3 หลายเดือนก่อน

    This looks very expensive and will take up even more land for roadways.
    How about an overpass with a trafic circle underneath.
    Im sure just as expensive.

    • @traffic.engineer
      @traffic.engineer 3 หลายเดือนก่อน

      Roundabout would cost more because it would take more right-of-way outside of the prior interchange design. That would require more stormwater management facilities, as well as shoring / retaining walls due to encroaching into the slopes of the overpass highway.
      And the roundabout would not be efficient for places with high traffic volumes. They max out at 1500 vehicles per hour for single lane roundabout (2500 for dual lanes). Roundabout interchanges are better for rural surburban locations where traffic is not projected to increase.

  • @Kattbirb
    @Kattbirb 6 หลายเดือนก่อน

    And what protection do cyclists and pedestrians have? Are they merely "accommodated"?

    • @Michael-lt3zb
      @Michael-lt3zb 5 หลายเดือนก่อน

      They are way more protected in this scenario than they would be with 2 4 way stop light intersections.

    • @Kattbirb
      @Kattbirb 5 หลายเดือนก่อน

      @@Michael-lt3zb Stating that we're "way more protected" isn't really helpful. How does the protection work? What tools are in place? Why would making more uncontrolled sliplane crossings and *left* turns on red be safer? That's what I want to know.

    • @Michael-lt3zb
      @Michael-lt3zb 5 หลายเดือนก่อน

      @@Kattbirb th-cam.com/video/pHXhOILb3Gc/w-d-xo.htmlsi=QOq917RU3ro8jlOX

    • @traffic.engineer
      @traffic.engineer 3 หลายเดือนก่อน +2

      ​@@KattbirbInstead of crossing 3, 5, or 7 lanes at a time, they cross one lane, then refuge, then 2-3 lanes with stopped traffic at a signal (no turns). Other than the slip lane (which can be modified with the DDI intact) they do not have to worry about turn traffic across their crosswalk. The center island also has barriers for positive protection.

    • @traffic.engineer
      @traffic.engineer 3 หลายเดือนก่อน +1

      ​@@Kattbirband pedestrians will not walk in front of the left turns on red. They will be directed to the barriered median.

  • @aequitas8749
    @aequitas8749 4 ปีที่แล้ว +7

    Just make roundabouts!

    • @busa89
      @busa89 4 ปีที่แล้ว +2

      who makes roundabouts on an overpass?

    • @brendonhalverson5178
      @brendonhalverson5178 4 ปีที่แล้ว +3

      Probably insufficient for the amount of traffic.

    • @theoneandonlylonely1
      @theoneandonlylonely1 ปีที่แล้ว

      @@busa89 You can make 2 roundabouts at each end. Also in my country we have roundabouts under the highways.

    • @trwent
      @trwent 5 หลายเดือนก่อน

      ​@@theoneandonlylonely1 2 roundabouts at each end. That would be a total of 4 roundabouts; is that what you mean?

    • @theoneandonlylonely1
      @theoneandonlylonely1 5 หลายเดือนก่อน

      2, one on the left and one on the right side

  • @yeehawo7
    @yeehawo7 3 หลายเดือนก่อน

    and we think roundabouts are hard …. at least there’s no traffic lights in them 😭
    edit: “hard” isnt the right word for this, maybe more “stupid magnet” 💀 i can smell the fender benders, side swipes, and teen confusion from here in arkansas LMAO

  • @Chris-bx4vk
    @Chris-bx4vk หลายเดือนก่อน

    This is horrible. I'm here now bc I'm trying to understand why NC ever thought this was a good idea. Slower and more dangerous. Idiotic. All I can assume is that it cost more money to build and a DEI hire was dumb enough to sign off on it.

  • @cocopufer5667
    @cocopufer5667 4 ปีที่แล้ว

    looks more like, how can we spend the most money possible while making a traffic nightmare works to me. WSDOT fix the freeway...too many short offramps, too many left exits, too many exit only lanes and get rid of the HOV.

    • @busa89
      @busa89 4 ปีที่แล้ว +9

      Sounds like you just like to complain. This has worked everywhere they have been built.

    • @brendonhalverson5178
      @brendonhalverson5178 4 ปีที่แล้ว +3

      How would redoing the entire freeway be cheaper?

    • @cocopufer5667
      @cocopufer5667 4 ปีที่แล้ว

      @@brendonhalverson5178 hahah seriously?!? my suggestions involve ELIMINATING HOV lanes and some exits, new construction on exits to the right is unnecessary. If you work for WSDOT i would be more than happy to draw up the plans as WSDOT has proven themselves incapable at doing the same. HAHA Redoing the entire freeway - what a card.

    • @SergeantTeabag
      @SergeantTeabag 2 ปีที่แล้ว +4

      Diverging diamond interchanges actually have significantly higher volumes (as the only left you can make is a dedicated lane during the cross), only two phases for traffic signals (no left turns through traffic), and they're cheaper since they save space. They also have 46% less crashes after a year compared to a regular diamond interchange, per a study done on the Springfield, MO DDI.

    • @trwent
      @trwent 5 หลายเดือนก่อน +2

      ​@SergeantTeabag Thank you for educating that doubting Thomas.

  • @rpminc1974
    @rpminc1974 7 หลายเดือนก่อน

    They are not content using just roundabouts anymore to confuse everyone while driving, they needed to come up with another confusing way to make you think twice where in the hell are you going !!

    • @trwent
      @trwent 5 หลายเดือนก่อน +2

      Drivers tend to adapt very quickly to DDIs. The evidence bears this out.

    • @BroadwayJoe99
      @BroadwayJoe99 4 หลายเดือนก่อน +1

      @@trwent I lived in Reno when a DDI was installed at the Moana Lane interchange of I-580/US-395. It's super easy to adapt to.
      Some folks just want to complain.

    • @traffic.engineer
      @traffic.engineer 3 หลายเดือนก่อน +1

      Roundabout interchange would fail here.
      It would cost more because it would take more right-of-way outside of the prior interchange design. That would require more stormwater management facilities, as well as shoring / retaining walls due to encroaching into the slopes of the overpass highway.
      And the roundabout would not be efficient for places with high traffic volumes. They max out at 1500 vehicles per hour for single lane roundabout (2500 for dual lanes). Roundabout interchanges are better for rural surburban locations where traffic is not projected to increase.