We have an app that allows users to check-out and ride a certain type of vehicle, and I want to build a button that, when pressed, redirects them to their default navigation app, optionally with a destination pre-selected. Crucially, this vehicle is not allowed on highways, so we do not ever want to direct users to a route with highways in it.
Right now, I am stuck because it looks like I cannot launch Apple Maps with "avoid highways" selected. I am using the URL
Yep—from that documentation it looks like there’s indeed no flag for that setting in the request URL. You may want to file an enhancement request on MapKit for that feature.