Not to the extent needed. These are two vast 8-lane thoroughfares. The intersection was once billed (probably incorrectly but not implausibly) as the widest in the world. They are also the extensions of major provincial and national highways. There are obviously many parallel roads, particularly running E-W, but few of them continue out of the downtown to other parts of the city.
If you look at the centre of this photograph, all of the tall buildings are located on the intersection, even though they look as though they are a block or two apart:
Here is the intersection from above (note ugly concrete planters to prevent pedestrian access):
Looking north from one of the towers. Main Street is the well-lit and very broad road snaking northward:
Looking SSE. The rectangular parking area to the right of the cable-stayed pedestrian bridge (between it and the roadway running off the right-centre of the picture) is the site of the Human Rights Museum (this has nothing to do with the topic but I'm enjoying looking at these photos):
The underground concourse at P&M. It is a circle with two underground shopping areas (one small, one fairly large) extending out of it.