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Originally Posted by 1overcosc
You're very much correct. And it's not just the super-new 400 and 7 highways. Highways 416, 417, 410, 404, etc. are all really good. It's really just the oldest parts of the 401 & the Toronto-Barrie section of the 400 that have substantial design flaws.
Another thing that MTO deserves praise for is actually rebuilding highways to new standards when warranted. For example Highway 417 between Ottawa & Montreal, which originally had gravel shoulders, has been upgraded to fully paved shoulders with rumble strips (new standard) with each newly repaved section. Whereas Quebec has also massively improved its road standards over time, but only applies them to new roads and doesn't really bother upgrading old ones.
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The 401 through Toronto definitely has design flaws by modern standards. However, it should be a credit to the early highway designers that the highway continues to function as well as it does, and carries the volumes that it does. For example, the Dan Ryan in Chigago, which uses a similar express/collector setup has been very extensively reconstructed and redesigned since it opened, something (at least to that scale) that hasn't occurred on the 401.
Being the roadguy that I am, I really quite like driving the older sections of the 401, despite their design flaws. It makes the drive slightly more harrowing, which is fun when the traffic is right.