As fanciful as Premier Doug Ford's notion to combat the GTA's legendary and worsening traffic by tunnelling under Highway 401 may be, the seemingly impossible infrastructure project just took another step toward becoming a reality this week.On Monday, the Province of Ontario issued an official Request for Proposal for a Feasibility and Congestion Relief Study on the mammoth undertaking, inviting interested parties to submit their bids to provide a comprehensive report on the scope (and practicality) of the work.While experts have estimated the cost of such a tunnel to be in the ballpark of a staggering $55 billion — requiring potentially 20 years, and countless traffic disruptions along the east-west freeway, to complete — Ford's team seems intent on pushing ahead and making the province home to what they call "one of the largest, most ambitious infrastructure projects in the world."Th...