Newcastle's central motorway... some still call it CME (Central Motorway East) as there was a CMW planned too. I think discussions have veered away slightly from that.
The CME: an eyesore, something that severs the city, rips its fabric apart, a huge hangover from the 60s, and a barrier to the western communities - Heaton, Byker, Walker - to get into town biking or walking.
It's simple really. Cut and cover. It sits in a concrete channel, so the cut has been done. Now we just have to cover it. You can compensate for the construction and general user emissions by creating a linear park on top. It has been done elsewhere. Boston springs to mind.
Next cut and cover projects: Gosforth High Street, then Coast Road...
Gotta think big to get big minds thinking.