An article crossed my desk yesterday by Donald Shoup that talked about the major flaws of using average trip generation and parking rates by public agencies in determining the minimum requirements for development. While I agree with the major criticisms of the article, no clear and reasonable alternative method is presented to address the shortcomings of these rates (few data sources, primarily suburban locations with free parking ...).
I think that most everyone would agree that having a great source of local data to assist in the creation of requirements for new/modified development; however, the costs generally associated with such a task prevent most of us from having this data.
Does anybody know of any agency that routinely uses sources other than the "national averages" put out by ITE, ULI and others? For instance, do you have provisions that were the public or private agency has sufficient data to contradict the national average, you would allow the requirements to be based on the "alternative" (or primary) data? Any other ideas of how agencies are trying to deal with this shortcoming?