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We have these in Atlanta and while I get the concept I think they are often improperly sized and become their own form of congestion. Some of them create weavin

We have these in Atlanta and while I get the concept I think they are often improperly sized and become their own form of congestion. Some of them create weaving due to lames becoming turn out on ramp lanes with little warning. It’s not uncommon to have a gridlock due to four lanes wanting to pour into two lanes. In examples where there are +1/+2 lanes where two are used for the respective on ramp/off ramp traffic there seems to be less gridlock. I didn’t grow up here so it’s possible these were built to the existing road width and the improvement was worth it even though the narrower versions are not ideally sized.

SOLAR_FIELDS 4y ago
They are getting pretty popular in central Texas where I live. I think they work best in a car only place where there isn’t neighborhood style traffic or pedestrians. This almost often means a location where a major road intersects a freeway. The one by the IKEA in Round Rock at 1431/I35 has been a great improvement, for example. The one on Parmer and I35 has also worked quite well. There is a similar approach, called “displaced left” down 1431 towards cedar park, however (Parmer and 1431) that has only been ok in terms of perceived improvement for traffic in the area. I will also note that they only started appearing here around 2015 onwards so maybe some design issues that you are talking about have been corrected in these newer iterations
tbyehl 4y ago
I have the impression the one at Pleasant Hill just isn't long enough between the lights and needs the sequencing adjusted to accommodate the incredible quantity of Atlanta-area drivers who were never taught not to block the box or that it's not a mere suggestion to stop at a red light. It has succeeded in reducing my trips to Microcenter tho.
- Moto7451 4y ago
  Yeah, no help for me there. I used to live walking distance to the Marietta Microcenter and cam take surface streets to it now. Driving standards here are all over the place. That's a whole other issue. Atlanta has done perhaps too good of a job of attracting people who spent a long time driving in small towns where traffic is simpler.

SOLAR_FIELDS 4y ago

They are getting pretty popular in central Texas where I live. I think they work best in a car only place where there isn’t neighborhood style traffic or pedestrians. This almost often means a location where a major road intersects a freeway. The one by the IKEA in Round Rock at 1431/I35 has been a great improvement, for example. The one on Parmer and I35 has also worked quite well. There is a similar approach, called “displaced left” down 1431 towards cedar park, however (Parmer and 1431) that has only been ok in terms of perceived improvement for traffic in the area. I will also note that they only started appearing here around 2015 onwards so maybe some design issues that you are talking about have been corrected in these newer iterations

tbyehl 4y ago

I have the impression the one at Pleasant Hill just isn't long enough between the lights and needs the sequencing adjusted to accommodate the incredible quantity of Atlanta-area drivers who were never taught not to block the box or that it's not a mere suggestion to stop at a red light. It has succeeded in reducing my trips to Microcenter tho.

Moto7451 4y ago
Yeah, no help for me there. I used to live walking distance to the Marietta Microcenter and cam take surface streets to it now. Driving standards here are all over the place. That's a whole other issue. Atlanta has done perhaps too good of a job of attracting people who spent a long time driving in small towns where traffic is simpler.