Whoaccio, I must be perfectly honest with you: that is the most awful transportation solution that I have ever seen.
I am going to assume that you probably got the idea from the elevated railway viaducts that grace Berlin and London, with their arcaded shops underneath, but, really, what we're seeing there today is the romanticization of a dirty industrial past rendered chic by the use of quiet electric trains. First off, don't forget that a railway system concentrates development and residential property values to a node, while a private car, by nature of its design, disperses those same forces. For these reasons, an elevated rail system would concentrate businesses and development along its corridor (despite the aesthetic negativities), while a freeway would just scatter it as far away as possible. Also, a railway or transit system serves people in the immediate neighbourhood equitably with people from outer areas, while the nature of urban freeways means that people who commute in from far away get preferential treatment because freeways are jammed first by people commuting in from further away restricting access to those living in the inner city neighbourhood.
Also don't forget that a freeway is more than just a social divider, it also spews noxious airborne pollution in the immediate area and is extremely loud and unpleasant. For these reasons, even cities that chose to build freeways through their inner city decided to sink them into trenches and create a buffer zone, rather than elevate them so that the fumes can be spewed at balcony level and the noise blared over a greater area. It's unlikely that any group other than the most marginalized in society would settle along Richmond or Adelaide, especially when the mufflers of roaring trucks and cars are ten feet away from their second floor balcony.
Finally, Richmond and Adelaide are three to four lanes, already. What purpose would it serve to elevate two into the air and keep two on the ground? At least with a three or four lane road you get the option of changing lanes; here you seem to be relegated to gridlock in the sky or gridlock on the ground. Don't forget that you need to dedicate a lane for either exiting the elevated portion and merging with the surface road, or vice versa. So, in effect, you now have a three lane road (no net change in the number of lanes over the present situation), but with the added inconvenience of having to merge frantically onto exit/entrance ramps.
Yeah, I'm sure you looked at google maps and that they had a setup like this in Tokyo, but ask yourself: 1) are the same private property values, both culturally and economically, at play in Toronto as they are in Tokyo? 2) Is the neighbourhood through which the elevated urban freeway in Tokyo traverses a sought after neighbourhood? 3) Is it possble that the residential neighbourhood evolved
after the construction of the freeway? It is entirely possible that these freeways were built through industrial or low-grade commercial precincts and, due to the obstruction of the freeway, gradually became a lower class residential neighbourhood.
The last time anybody in the Western World proposed something like this was well before the Second World war when nobody knew about the effects of freeways in urban areas. This was also back in the day when women smeared Radium on their faces.