Alt text for above:
Pic 1, A full sized garbage truck seen from rear occupies entire width of a trail. People stand on the grass verge looking on.
Pic 2, Seen from rear, a van stops alongside a dropoff box of some sort. Someone walking two dogs approaches on the trail the van is stopped on.
Pic 3, Seen from side from within a park, a Cambridge Animal Control and Rescue van drives on a shared-use path.