This story is closed for comments.

Oldest First
  • Pseudonym Sep 25, 6:30 p.m.

    Quote from alana2: "I still have problems with the interchange at the Streets at Southpoint."

    No offense, but perhaps you should consider turning in your license if you have trouble navigating a simple SPUI.

  • Pseudonym Sep 25, 6:24 p.m.

    Quote from wildervb: "...Clover Leaf interchanges are the best..."

    HAHAHAHAHAHAHAHAHAHAHA!!!!!! If you honestly think that cloverleaves are the best then travel through the I-40/US-1/I-440/US-64 interchange in Cary between 7 AM and 9 AM, or between 4 PM and 6:30 PM. Make sure your affairs are in order and that your collision coverage is up to date.

  • Pseudonym Sep 25, 6:20 p.m.

    I drove through one of these things in Atlanta (Pleasant Hill Rd at I-85.) Honestly, if you can't figure one of these out, you've got problems, and you should do society a favor and turn in your license because you are intellectually unfit to be on the highways with the rest of us. These are EASY to navigate, and if they truly improve traffic flow, then more power to DOT!

  • RandolphBloke Sep 25, 3:53 p.m.

    These actually lower congestion quite a bit even though it wouldn't seem to be the case having lights. I think even bad Triangle drivers can adjust to these quickly. (I won't back that 100% because roundabouts proved to be too much for us.)

    There's also a modified version of this with very small underpasses that does away with the need for lights. On highly busy and congested areas those can drop traffic jams even more than this proposed type.

  • btneast Sep 25, 3:12 p.m.

    there will be no dedicated turn lane on the freeway where entering and exiting traffic compete for access (while entrants try to speed up and people exiting try to slow down)...

    especially trying to exit the highway in the same lane where traffic is entering the highway.

    The above statements are why cloverleafs are not ideal....

  • buchkshot Sep 25, 3:00 p.m.

    For an animated visual example of a DDI, go to youtube. There are about 10 examples of same.

  • anonymous99 Sep 25, 2:14 p.m.

    "This insanity means that one direction on a main thoroughfare will always have a red light."

    But it also means there will be no dedicated turn lane on the freeway where entering and exiting traffic compete for access (while entrants try to speed up and people exiting try to slow down)... And it means less space and materials because there are no clover ramps.

    It really makes a lot of sense if you think about it. A clover design does prevent left turns, but at the cost of a lot more infrastructure (four entry/exit points on each side of the highway instead of just two in this design).

    WRT the people saying "everyone stinks at driving", you're right. Drivers scare me, too - especially trying to exit the highway in the same lane where traffic is entering the highway. This design prevents that situation.

  • hp277 Sep 25, 1:16 p.m.

    I'm not sure I get it. If you want to allow traffic on one road to easily go onto another road, then why not use right turn lanes that then circle around to the road below. We have those everywhere. Having this diamond means there must be a stop light, whereas to two right-turns (one for each direction of the other road) requires no stop lights.
    paulej

    Exactly. A diamond/cloverleaf intersection, in use since the first interstates in the 50's, works just fine with all right turns and no stoplights at all.

    This insanity means that one direction on a main thoroughfare will always have a red light.

  • disgusted2010 Sep 25, 12:16 p.m.

    More of Tata's insanity. One day the people of NC will learn just how bad things are in DOT and rue the day that this carpetbagging bully was brought to NC by Art Pope.

  • anonymous99 Sep 25, 12:14 p.m.

    paulej - I think it's advantageous because it has on and off ramps for the freeway and the road that crosses it, allowing access to each direction from each direction with only one stoplight.

    Country Girlz Have MORE fun - Have you ever considered reading an article before commenting on it?

  • ILoveDowntownRaleigh Sep 25, 12:05 p.m.

    The Saunders/I-40 interchange seems like the ideal application for the new diamond design. The exit-ramp running off of I-40 onto Saunders southbound is currently two lanes, and during rush hour both lanes back up onto I-40. With more traffic in the future, there will be cars backed up at a dead stop on eastbound I-40, and you know that can't be good.

    That intersection also has plenty of room for whatever is required by the diamond design specs. Good choice, DOT.

  • kcfoxie Sep 25, 11:19 a.m.

    40/Wade/440... yesterday someone coming off 440 to Wade Ave/Downtown STOPPED ENTIRELY ON THE CLOVER LEAF and I am failure sure I heard the brakes of what was destined to be a rear-end collision. Clover leafs are great if you actually know how to drive and aren't afraid of EVERYTHING.

  • paulej Sep 25, 11:18 a.m.

    I'm not sure I get it. If you want to allow traffic on one road to easily go onto another road, then why not use right turn lanes that then circle around to the road below. We have those everywhere. Having this diamond means there must be a stop light, whereas to two right-turns (one for each direction of the other road) requires no stop lights.

  • seeingthru Sep 25, 11:03 a.m.

    If people are confused by traffic circles already what mayhem will ensue when encountering one of these?

  • Country Girlz Have MORE fun Sep 25, 10:47 a.m.

    Who is paying for this ????????

  • buchkshot Sep 25, 10:46 a.m.

    NCDOT is constructing such an intersection in Lumberton. Remains to be seen how the locals handle the finished product. One benefit, observed firsthand, is the fact two bridges can be constructed while the old bridge, in the middle, can be used to great effect, with minimum interruption.

  • VickLo Sep 25, 10:39 a.m.

    While they do this they need to increase the speed limit to a nice round 100 mph. That ought to finish the job of wiping out the less competent drivers.

  • itlsss Sep 25, 10:34 a.m.

    70% of the motoring public in N.C. cannot work out a turn lane and DOT expect them to handle this?

  • ezLikeSundayMorning Sep 25, 10:30 a.m.

    I think this is a situation where it will seem much more clear actually driving through it than looking at an overhead map.

    But I do understand the hesitation of some. The original 2 lane traffic circle on Hillsborough was insane. It's fine now. My pet peeve is those interchanges that have a yield sign for the right turn. Left turning traffic may not know you have a yield sign confusing the situation. I'm always having to check to see if I have a car going straight to screen for me so I can turn right. It's safe enough, but it causes a lot of hesitation and awkward pauses.

  • androiddj Sep 25, 10:20 a.m.

    clearly demonstrating how low our average drivers IQ's are

    put down the cell phone and pay attention to the 2 ton shell of metal your darting around in!

  • btneast Sep 25, 10:09 a.m.

    There is nothing wrong with roundabouts, they work fine in every other modern country in the world (even third world countries manage them), its the useless people that don't know how to use them.Perhaps more time should be spent teaching people how to drive rather than handing out a driving license to anyone who can start a vehicle

    It's more about what the population in an area is used to. Roundabouts have rarely been used in this part of the country, so few are used to it. Even if you know how to navigate one, it's the other drivers around you that make me hesitant....do they know what to do? The areas around the world that do well with them have had them for many years, so yes, they do better with them. It's more familiarity than intelligence.

  • stormwaterguy Sep 25, 10:08 a.m.

    People around here can't even drive a traffic circle correctly - DOT expects them to do a diamond diverge without crashing head-on into the opposing traffic?

  • hp277 Sep 25, 9:58 a.m.

    What's wrong with a classic cloverleaf interchange? All right turns and no stop lights needed at all.

    Sometimes it seems like engineers just are not satisfied with a classic design that works.

  • AmazedAtThis Sep 25, 9:54 a.m.

    Takes less land than a cloverleaf, allows DOT to improve existing interchanges without taking more land or existing businesses (that means its cheaper and less intrusive folks), scientifically proven to reduce accidents, improves commute times. And it assumes some personal responsibility from us all in that people need to know how to drive. That hits every rightwing checklist item - Wow, the negative folks are having to scramble to bash this one.

  • sinenomine Sep 25, 9:50 a.m.

    Flashing yellow does not give right-of-way. It indicates that one may proceed, but with extra caution.

    I do find flashing yellow left turn arrows to be confusing. It used to be that a green ball was displayed. If you're turning left on a green ball it's elementary that you're supposed to yield to on-coming traffic, is it not? So why change to another kind of signal which is potentially confusing? I don't get that one.

  • sinenomine Sep 25, 9:46 a.m.

    mozdmel, people are not rendered useless because they don't like traffic circles.

    What we COULD do without, I would gently suggest, is the kind of intolerance exemplified by your comment.

  • 68_dodge_polara Sep 25, 9:43 a.m.

    As I saw a woman yesterday shuffling papers on the phone while eating Bojangles yesterday the DMV had better keep it simple for drivers in this state.

  • 68_dodge_polara Sep 25, 9:40 a.m.

    "a flashing yellow does not give right away, flashing yellow means to slow and be careful of other traffic. On Erwin Rd in Durham left turns have a flashing yellow but the oncoming traffic is green, i.e. flashing yellow yields to oncoming traffic, NOT right of way."

    Ah yes a flashing yellow light does give the right away unless it's a flashing yellow arrow.

    This exactly the confusion that some of the latest idiotic things the DMV has been doing in this state.

  • mojaintsmall Sep 25, 9:37 a.m.

    accidents waiting to happen - mojaintsmall

  • mozdmel Sep 25, 9:36 a.m.

    There is nothing wrong with roundabouts, they work fine in every other modern country in the world (even third world countries manage them), its the useless people that don't know how to use them.Perhaps more time should be spent teaching people how to drive rather than handing out a driving license to anyone who can start a vehicle

  • Felton23 Sep 25, 9:27 a.m.

    Actually, this is a very good idea. All for it.

  • luvbailey Sep 25, 9:25 a.m.

    My concern is with the "visual clutter" a driver faces. Looked at the simulation and in someways reminds me of all the visual clutter you see on a superstreet: multiple stoplights, warning signs everywhere, directional signs everywhere. The superstreet in Leland - US 17 S coming out of Wilmington - makes me crazy with all the lights, signs, etc, especially at night. Anybody else feel the same way?

  • 68_dodge_polara Sep 25, 9:24 a.m.

    Wonder is this makes as much sense as placing cross walks at non intersections on busy four lane roads as we have seen in Durham and Chapel Hill as of the last couple of years encouraging pedestrians to play frogger?

    Why am I skeptical?

  • kenshi Sep 25, 9:21 a.m.

    @ 68_dodge_polara... a flashing yellow does not give right away, flashing yellow means to slow and be careful of other traffic. On Erwin Rd in Durham left turns have a flashing yellow but the oncoming traffic is green, i.e. flashing yellow yields to oncoming traffic, NOT right of way.

  • btneast Sep 25, 9:10 a.m.

    Cloverleaf's work until you get to a high traffic interchange.

    Exactly, cloverleafs are a disaster.....the traffic coming on clashes with the traffic getting off.....they are trying to merge into your lane while you are trying to merge into their lane...

  • btneast Sep 25, 9:07 a.m.

    Remember all the fuss over a simple traffic circle? They think THIS will work? HA!!

    The traffic circle that caused so much confusion wasn't a "simple circle"....it was a twin ring circle that had single lane ingress as well as dual laned ingress.

  • mistervegas Sep 25, 9:04 a.m.

    Sounds like a recipe for disaster. Look how well the roundabouts worked near NCSU.

  • 68_dodge_polara Sep 25, 9:03 a.m.

    Is this as good idea as the recent flashing yellow arrow that doesn't give the right of way however every other flashing yellow signal gives the right away in this state? Why am I skeptical?

  • weasel2 Sep 25, 9:00 a.m.

    What is DOTs problem they tried roundabouts, they didnt work so more money had to be spent on changing them, Guess NCDOT just likes to spend money on untried things.How about fixing all existing roads and bridges.

  • iamsiam1096 Sep 25, 8:46 a.m.

    I don't have a problem with putting something where it is needed, I just wonder is this being built to say "we have one" or to really solve an issue. (kind of like the traffic circle they built in Garner at Vandora just before 50 claiming it solved all the problems when in fact it did not, putting the simple stop light in at Woodland and Old Stage made for another way to access Old Stage with a light where prior to that the only way was Vandora. They spent money that was not necessary to say they had a traffic circle. If it can be justified then fine but don't spend the money just to say you have one.

  • wake4life08 Sep 25, 8:43 a.m.

    Civil Engineering at its finest.

    This will be a disaster

  • sinenomine Sep 25, 8:41 a.m.

    I can't tell anything about DDIs from the graphic which accompanies this article, but I watched the video and it helped my understanding a lot. I agree with KingDad that "new" doesn't always mean "better" but in my opinion DDIs just might be an improvement in some situations.

    So much about what one considers a good or bad idea when it comes to traffic flow depends on one's driving experiences. Most people in Raleigh seem not to like traffic circles (roundabouts), for instance. Having spent a lot of time in Washington DC, though, I understand and like them and have no trouble with navigating them. It all boils down in many cases to being a matter of personal taste.

  • lets_b_real79 Sep 25, 8:36 a.m.

    This should be fun....

  • onefortheages99 Sep 25, 8:34 a.m.

    After finding a youtube animation of how the diverging diamond works, it's seems pretty clever, but there definitively be a learning curve for drivers.

    Agree with stratomaster that the SPUI is a great solution. Wish they had used them on all the 540 interchanges, not just at Six Forks.

  • Eric the Actor Sep 25, 8:34 a.m.

    Have any of you people complaining about the Hillsborough St traffic circle driven through it lately? I go through it at rush hour and never sit for more than a few seconds. It works just fine.

  • stratomaster Sep 25, 8:18 a.m.

    I thought the SPUI was the next best thing since sliced bread and now they want to run out the DDI??!?

  • dwntwnboy2 Sep 25, 8:15 a.m.

    Remember all the fuss over a simple traffic circle? They think THIS will work? HA!!

  • Steve Mchugelarge Sep 25, 8:07 a.m.

    If people can't figure out traffic circles why do you think they can figure Diverging Diamond Interchange, or DDI,??

    Arthur downtown

    THIS!

  • tired2 Sep 25, 8:07 a.m.

    Like all innovative ideas...too hard for people in Raleigh - just look at how hard they find traffic circles

  • alana2 Sep 25, 8:06 a.m.

    What happened to the KISS method? Keep it simple stupid. I still have problems with the interchange at the Streets at Southpoint.

Oldest First