A friend sent me this link to a street food guideline matrix for some top street food cities. The interesting part is the discrepancy between rules governing bathroom access. In Spokane if you are using a mobile food permit and plan to stay in one location longer than 2 hours then you must have a signed bathroom access agreement on file for that location. 

The website also has good coverage of the recent debate about changing San Francisco’s rules governing street food.  Seattle is going through the same process right now.