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 Once the study area has been broken into zones, the next task involves quantifying the number of trips that each zone will produce or attract. The number of trips to and from an area or zone is related to the land use activities of the zone and the socioeconomic characteristics of the trip-makers. There are at least three characteristics of land use and trip-makers that are important. The density or intensity of the land use is important. Many studies begin by determining the number of dwellings, employees, or tenants per acre. The intensity can be related to an average number of trips per day, based on experience with the type of land use at hand. Next, the social and economic character of the users can influence the number of trips that are expected. Character attributes like average family income, education, and car ownership influence the number of trips that will be produced by a zone. Finally, location plays an important role in trip production and attraction. Street congestion, parking, and other environmental attributes can increase or decrease the number of trips that an area produces or attracts. The three major techniques used for Trip Generation Analysis are Cross-Classification, Multiple Regression Analysis, and Experience Based Analysis. Each of these techniques is discussed as a separate concept within this section.
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