I've always thought Hwy 413 is misunderstood for what appears to be its actual purpose. All of us know Hwy 401 is very busy, but many seem to forget that many Hwy 401 trips will pass through the GTA, let's say from Exit 320 (Hwy 25) to Exit 418 (Harmony Road) and not actually end in the GTA. The purpose of Hwy 413 I always thought was to get traffic, commercial traffic would be great for this, from points west in Southern Ontario, to points north. With the freeway supposed to be in the greenbelt, shouldn't that be a checkmate from development right there? That is we are not speaking of a sprawl creator, but rather a region bypass.
Think about it, look on Google Maps, and traffic around what I like to call the Molson Interchange (401/427) is almost always in a blood red zone in that stretch, ideally if we can move traffic that's bound for Hwy 400 N off this stretch of Hwy 401, this could free up space on Hwy 401.
The only problem is how there isn't a GTA East Freeway, or rather an extension of Hwy 413 to reach say Hwy 418. I realize such a road would probably be impossible to build now, but this would allow a complete fair bypass around the GTA for traffic heading to points east from points west.
In other words, this is similar to A-30 in the Montreal area, has there been any serious efforts of sprawl since they built that road, I don't think so. I used to often go with my parents to Newfoundland, and using A-30 was a great way to skip the hellish drive on A-40. Now before you tell me A-30 is tolled, remember that A-30 is a reasonable toll and there's but one toll barrier of a fixed price. Driving through Valleyfield, it is also quite easy to bypass this toll. Hwy 407 ETR as we know is tolled using an economic model to keep the traffic moving at all costs, and let's not get into all the unfair charges that 407 ETR puts into the calculation of a toll.