https://www.library.mto.gov.on.ca/Sy...2-7ea66570527f
Slide 34
{418} only has an AADT of around 3 to 4K? That's a big surprise for me.
I've always thought that rush-hour traffic on {401} from Oshawa to {412} is bad enough to send some up the {418} and that {412} has effectively ceased to be the GTA East Bypass.
I used the {418} once on a Friday afternoon in late July last year. When I got on {401}, traffic was still busy. Using {412} really would have meant paying just to roll slowly through Oshawa later on.
Maybe people just go for {35}/{115} at that point despite a lower speed limit and a westward curve around Newcastle.