Google Street View car?
On a trip to SF a couple months ago, I saw a car which had four Nikon DSLRs mounted on the roof, with wide angle lenses. This was around 22nd St and Guerrero.
Could this have been a vehicle associated with Google Street View?
Here's the intersection on Google Street View. Obviously, the photos on Google of that intersection weren't taken at the same time as my picture -- but perhaps this car was on the way to another neighborhood?
UPDATE: Probably not?