Random Interchange Proposals

[BostonUrbEx]

US-1 and MA-129/Walnut St. One of the worst exits in state, consistent traffic problems on half of the ramps and accidents way too often to count.

Here's my sketch out for a sort of Half Parclo/Diamond hybrid.

In addition, acceleration/deceleration lanes would be good, even if brief. Or perhaps better (in my "improve yet somehow add no capacity" mind) make the right lanes exit only (leaving 4 lanes going under the bridge).

 

[gyro]

how do you get from 1N to 129W?

 

[dshoost88]

how do you get from 1N to 129W?

I was asking myself the same thing.

 

[HenryAlan]

how do you get from 1N to 129W?

Maybe nobody will want to do that?

 

[BostonUrbEx]

LOL

I forgot to add a line... Oops. I'm sure you can use your imagination and add a line coming off the southeastern-most ramp.

EDIT: This is supposed to be in Design a Better Boston.

 

[Ron Newman]

Are the accidents caused by weaving in the cloverleaf? It looks like the entrance and exit ramps are reasonably far apart as it is.

 

[BostonUrbEx]

Are the accidents caused by weaving in the cloverleaf? It looks like the entrance and exit ramps are reasonably far apart as it is.

I'm not positive on cause, but I hear of roll overs pretty often, so perhaps turn radius, and I usually see a lot of rear ending (probably because of stop signs at the onramp and/or lack of acceleration lanes).

 

[Kahta]

I'm not positive on cause, but I hear of roll overs pretty often, so perhaps turn radius, and I usually see a lot of rear ending (probably because of stop signs at the onramp and/or lack of acceleration lanes).

Late lane change + hitting an exit ramp with what I believe is a 15 mph speed limit.