Correct. the freeways were always planned for CTA median ROW. Even if it never were to happen, those spaces would have been converted to express lanes. "Recent-past" plans called for the extension of the Blue Line beyond O'Hare to Schaumburg using the medians of the I-90 tollway...the same dilemma we are discussing in the Detroit situation. The price tag was enormous as the entire tollway would have to be reconstructed and would also require subway segments. The plan was scrapped for suburb to suburb rail [[Star Line) which will have a further reach and have the most value per mile.
As far as earlier CTA ground rail discussion, the Pink, Yellow, and Brown lines run at grade in portions [[Yellow line most of it) Though they cross intersections, they never stop for any other traffic. However, the duration of closed gate crossings for automobile traffic is very short...nearly the same as a traffic light and have low volume signals to not disturb residents nearby. The trains have excellent stopping power and head on train collisions with a car are incredibly rare.
Red Line [[Subway, freeway median, elevated structure or raised embankment)
Blue Line [[Subway, freeway median, elevated structure)
Orange Line [[Elevated Structure, raised embankment)
Green Line [[Elevated Structure)
Pink Line [[Elevated Structure, at grade)
Yellow Line [[Mostly at Grade)
Purple Line Non Express [[Raised embankment)
Brown Line [[Elevated Structure, at grade)
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