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Highway construction question

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jeffandnicole:
Is the OP asking about converting shoulders to travel lanes during the construction project, or permanently converting the shoulders to a travel lane?

The latter is generally not permissible, especially regarding interstate highways. Non-interstate widenings often will convert shoulders to travel lanes where full shoulders aren't feasible.

On a temporary basis though during a project, it's ultra-common.

triplemultiplex:
Lots of places allow traffic to use the shoulder lane during peak travel times.  It's a useful stop-gap measure where expanding the road more permanently is not in the cards financially or physically.  They have a bunch of shoulder lanes out in Hawaii.  Pretty sure they are also in use on the super 2 portion of US 6 out toward The Cape.  They run buses on the shoulder lanes around Chicago.

DJStephens:

--- Quote from: jeffandnicole on December 01, 2021, 12:32:05 PM ---Is the OP asking about converting shoulders to travel lanes during the construction project, or permanently converting the shoulders to a travel lane? quote]

They did it in Massachusetts.  Route 128 (re-routed 95) around the W side of Boston allowed rush hour traffic to use the breakdown lane for decades on the six lane section between State route 9 and 95 in Dedham.  Believe it was also done on I-93 N of the lane drop between 128 and I-495.  Used to refer to the "lanes" as Salvucci lanes, after the infamous transportation secretary. 
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