A few years ago in St. Louis, they shutdown a 10 mile stretch of I64/40 ( THE central artery in St. Louis) to completely rebuild the highway and interchanges from the dirt up. They closed and rebuilt one 5 mile stretch in 2008 and closed and rebuilt the other 5 mile stretch in 2009 with reopening of the completed highway in December, 2009. Once again, they did the entire roadway PLUS a complete redesign and rebuild of all exit ramps. <two years. You can't tell me the same can't be done (in some part) here because of weather, scheduling, crew preference to work days, etc. B.S.
You can read an overview of the project here and here
Crews worked 6 days/nights a week to complete. No overnights, but work went well into the evening.
It was a pain in the ass for commuters at times, but when that road reopened it was a tremendous improvement and it took less than two years to re-do a highway, all bridges, and interchanges that are expected to last for decades. At the time, it was estimated that this project would have taken 9 years to complete if traffic had been counterflowed/continued on the highway (i.e. orange barrels). People bitched, complained, imagined a "traffic Armageddon", etc...but in the end, you just found other ways to get around.
IMO, Secor could be shut down and rebuilt in no time. I wish they'd do something similar on the 475 project too. I saw first hand how well the St. Louis project went.
Oh...one big incentive: The project was given a firm deadline of 2 years from start to finish. If the project finished early, the construction firm got a $2 million bonus. You think that motivated these guys a little?