The problem is that the chalk crosswalk is placed across two bicycle lanes, at the outlet of a bicycle lane turning outlet which is prioritzed for the through-traffic (cars). It's meant for cyclists that want to cross the street, so they can wait out of the way of cyclists on the path, or ride up a cut-out instead of a curb.
This means that to use the chalk crosswalk, a pedestrian would have to cross over a bicycle path, then the road, then another bicycle path to the sidewalk... while there are actual prioritized pedestrian crossings not too far away.
But I guess they are too far- even the chalk path is too far for the guy above. :)
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