Looking at the intersection (Wellington and Scott) and the details in the reporting. The person was sleeping on a grate. This is the only grate I see anywhere near the intersection (galvanized one just past the last bollard) that does not have bollards or other fixed obstacles between it from the road.
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If that is it, there is no curb and they are basically sleeping on the edge of the road (Scott). I still don't understand how they did not see them (vehicle too large for their skill-set?) and how they did not know they were dragging "something".