In congested central areas, there are low requirements or exemptions. The size of an establishment also affects the parking requirements. For most uses, parking is required only for establishments of a certain size. In low-density districts only very small establishments are exempted from the parking requirements. In high density districts only very large establishments are required to provide parking.
Requirements also vary with the type of use.
Commercial uses have been divided into nine categories on the basis of these traffic-generating characteristics and are designated by letters. Each commercial use falls into one of these designated categories. Thus, the parking requirements reflect the traffic- generating qualities of various commercial uses, their size, and the districts in which they are located. For all new manufacturing establishments or enlargements, one space is required for every three employees or for every 1,000 square feet of floor area, whichever will require the larger number of spaces. These regulations attempt to relate the number of parking spaces to the number of cars the establishment is likely to generate.