Working hurricane recovery efforts in 2004, I was amazed at the number of flat tires, even on the highways and other well-travelled areas. A little debris goes a long way. In one parking lot I worked from, there were a half-dozen cars stranded with flats, either having no spare or having already used it. We all carried cans of Fix-a-flat after the first day and handed out plenty. Having any larger relief vehicle stuck with a flat was a nightmare. Using an outside tire service company meant a 3-12 hour wait once you got in touch with one.