Editing Trip generation (section)

==Databases==
The [[Institute of Transportation Engineers]]'s ''Trip Generation Manual'' provides trip generation rates for various land use and building types. The planner can add local adjustment factors and treat mixes of uses with ease. Ongoing work is adding to the stockpile of numbers; over 4000 studies were aggregated for the latest edition.

ITE Procedures estimate the number of trips entering and exiting a site at a given time. ITE Rates are functions of type of development based on [[Dependent and independent variables|independent variable]]s such as square footage of the [[Floor area|gross leasable area]], number of gas pumps, number of dwelling units, or other standard measurable things, usually produced in site plans.<ref>{{cite web |access-date=December 17, 2021 |title=Independent Variables |url=https://www.ite.org/technical-resources/topics/trip-and-parking-generation/independent-variables/ |website=Institute of Transportation Engineers}}</ref> They are typically of the form <math>Trips = a + b * Area</math> or <math>Trips = a + b ln (Area) </math>. They do not consider location, competitors, complements, the cost of transportation, or other factors. The trip generation estimates are provided through [[data analysis]]. Many localities require their use to ensure adequate public facilities for growth management and subdivision approval.

In the United Kingdom and Ireland, the [[TRICS]] database is commonly used to calculate trip generation.