BC7 / Lougheed in Coquitlam is often tagged expressway=yes and this does not forbid pedestrian access.  Some segments of it are tagged with foot=no -- for example at: https://www.openstreetmap.org/way/35485270

Is there any signage on the highway or at the entrances to it to indicate that foot=no for the segments around here?  E.g. on: https://www.openstreetmap.org/way/337471073

Ref: https://www.openstreetmap.org/user/Jennifer%20Pownall/diary/408540#comment60969