I'll just drop you at the point where the painted bike lane is *marked as crossing the onramp* and then just. . . vanishes. Enjoy this example of "but the bike lane brought me here." (The Google car seems to have come through here on a relatively quiet morning.) maps.app.goo.gl/sKjYbSLiyCL5...
That's horrifying. Is there a longer detour, like somehow on Highway 128? I would take a long detour to avoid that overcrossing.
I used this route, crossing St Laurent headed east just south of the 417 I to the industrial area. Cyrville wasn't a pleasure to bike on but it did have a painted bike lane and no on/off ramps to cross. There's a pathway behind the plaza that connects to the rail trail. Not legal access I'd guess.
I considered hopping onto the path behind the Rona and then cutting cross country through the farm (there's a single track) to the Dewberry Trail and picking up Walkley at the trailhead (slightly less terrible highway crossing) but had a time constraint to deal with
that's what it take too