Quote:
Originally Posted by Djeffery
Is there such a rule though? Where was highway 1 that became 401? I would think it would more correctly be called 402. 403 should more be 405 than 403. 402 crosses 2 but goes nowhere in relation to it. 404? Should 406 be 406, or should have been saved for somewhere near highway 6, like the Hanlon in Guelph and the hopeful expansion to Hamilton. 427 is the highest 400 series commonly used (aside from the supposed 451 number assigned to the QEW for internal government purposes). RR 57 wasn't even a provincial highway, unlike neighbouring 12 and 412. Maybe the rule you are thinking of, if it exists, is as you say, a "replaced" highway. 416, 417 for example, replaced and incorporated parts of 16 and 17.
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I read it from the History of King's Highways... (I think it's managed by sonysnob?)
I think MTO tries to adhere to this rule as much as it can nowadays (though, in that case, 418 is a real anomaly). It's also interesting that for 400 through 409 (aka the ones apparently numbered by the order of construction), we don't have 408. It just seems that, for 410 and onward, MTO does bring in this new rule, i.e. 410 for 10, 412 for 12, 416 for 16, 417 for 17, 420 for 20, 427 for 27.