Mark Geller with Plug In America was stopped in San Francisco by Mark Seelig, a KCBS reporter. Two news stories came out of it.
There was no photo to accompany the stories, however, here's a photo of a Tango parked on upper Stanyan St., a 30% grade, the steepest in San Francisco. It has a stairway instead of a sidewalk. As scary as it may look, because the center of mass is only 12.25 inches from the ground, it would still take roughly 1,000 lbs of lift to push it over.