items and location changes. Food truck rallies and food truck parks are also growing in popularity in the US. At rallies, people can find their favorite trucks all in one place and as well provide a means for a variety of diverse cultures to come together and find a common ground over a love for food. On August 31, 2013, Tampa hosted the world's largest food truck rally, with 99 trucks attending. The Tampa Rally broke its own record by bringing together 121 food trucks in 2014. Chicago Food Truck Festival hosts over 40 trucks each year with 60,000 guests participating over two days in Chicago. And food truck parks, offering permanent locations, are found in urban and suburban areas across the US. The popularity of food trucks lead to the creation of associations that protect and support their business rights, such as the Philadelphia Mobile Food Association. Business and economics Food trucks are subject to the same range of concerns as other foodservice businesses. They generally require a fixed address to accept delivery of supplies. A commercial kitchen may be needed for food prep. There are a variety of permits to obtain, and a health code to observe. Labor and fuel costs are a significant part of the overhead. Legal definitions and requirements for food trucks vary widely by country and locality. For example, in Toronto, some of the requirements include business and liability insurance, a Commercial Vehicle Operator's Registration for the truck, permits for each municipality being operated in (downtown, various suburbs), a food handler certificate, appropriate driver's licenses for drivers, assistant's licenses for assistants, and a health inspection. As the rising number and popularity of food trucks push them into the food mainstream, region by region, problems with local legislators and police reacting to new situations, and pushback from brick-and-mortar restaurants fearing competition, are amongst issues having to be worked through, creating significant business uncertainty. Chicago long held the distinction of being the only city in the United States that did not allow food trucks to cook on board, which required trucks to prepare food in a commercial kitchen, then wrap and label the food and load it into a food warmer. In 2012, under pressure from food truck owners and supporters, including the University of Chicago Law School, regulations were changed to allow on-board cooking, however, controversially, food trucks are required to park 200 feet away