Eglinton/Lower Base Line
Looking at the border between Oakville and Mississauga, it looks like Upper Middle Road and the QEW are actually the same concession road?
And why does Eglinton become "Lower Base Line"?
My wife and I routinely take road trips west from Mimico (out to Guelph, Elora, etc) and our route back home when we don't want to take the QEW or 401 is to jump on #1 SR at Guelph Line in Burlington to Appleby Line and then north on Appleby to #2 SR to Tremaine Rd where a bit north you pick up The Lower Base Line Road that can take you all the way to Ninth Line (Ford Drive to the south) where LBLR becomes Eglinton.
As urban sprawl continued, the old names such as Lower Base Line were changed to make it sound more urban. Back in the 50's, Eglinton was Richview SR.
Lower Base Line is so named because it was the starting point for surveyors back in the 1800's to draw up the concession and side roads both north and south.
Britannia Road is another one of our routes home when we're further north. You can pick it up at its beginning at Milburough Line just west of Kilbride (Burlington). We usually take it to Tremaine and then go south where we pick up Lower Base Line
Another example is Olde Base Line Road in Caledon which goes from Winston Churchill Road east past the Cheltenham Badlands and all the way to Airport Road.
Concession and sideroads were surveyed south and north of there. The southern border from Olde Base line is Mayfield Road which is the dividing line between Brampton and Caledon.
If the topography and layout of SW Ontario interests you, pick up a copy of Thomas McIlwraith's "Looking for Old Ontario", published by U of T Press back in the early 90's. Great intro to how our province was settled. The part on the surveying of the province is fascinating. Not sure it it's in print or not.
And the QEW was originally called "The Middle Road" because it was between the two alternate routes, Hwy 2 (Lakeshore) and Hwy 5 (Dundas st). Hence the reason for "Upper Middle Road"