Another thing: I’ve always heard people say that Highway 15 is too built up for widening. Are they referring to Dugald Road between Perimeter and Plessis Road? If yes, is it possible to just widen it by eliminating the shoulders, slightly narrowing the lanes to 3.2 meters each and lowering to speed limit to 50~60 kph? Then, we only need to do a semi-cloverleaf interchange at 101/15 (with 101 flying over, obviously). If one wanna be fancy, we can put roundabouts on both intersections.
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