Thanks to Dale Bracewell from City of Vancouver for this speculation on an aspect of the Arbutus Greenway’s design.
The upcoming detailed design of the new Greenway will need to address many issues, with one of the toughest being the intersections with motor vehicle arterials (Broadway, 12th Ave, 16th Ave, 25th Ave, and so on).  But the biggest of them all is 41st Ave, where the intersection is already busy and complex (41st, East Blvd and West Blvd and now the Arbutus Greenway).
Could a possible answer look like this, a grade-separated crossing?  The Te Whitanga shared bridge in Auckland, New Zealand.

The current intersection at 41st is either clumsy or frightening for people travelling on foot or on two wheels on the Greenway.