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106 Data-Collection Methodology and residential building lobbies are good places for con- ducting inbound interviews. A methodology and procedural instructions were devel- 2. Delete the questions about the previous trip if inbound oped for the selection of data-collection sites and for the data interviews can be conducted. The researchers found incon- collection itself. Those procedures were used to conduct sur- sistencies and confusion associated with responses to those veys at three MXDs. The procedures were refined as a result questions. of the experiences and lessons learned. Appendix C describes 3. Add a time for the previous trip's arrival at the interview the recommended method. building if no inbound interviews can be conducted. The The researchers recommend that additional data be col- time is needed to determine whether it was made during the lected. The researchers suggest that MXDs selected meet at A.M. or P.M. peak period. least the following criteria: 4. Consider adding a question seeking induced trip infor- mation. An add-on question to attempt to determine Be representative of typical MXDs being developed or being induced trips was asked as part of the Legacy Town Cen- planned so the data will be of use for years to come; the area ter interviews. Respondent understanding about the ques- in which the MXD is located should also be representative; tion was inconsistent, so the results were not reported Have at least four land uses so that most land use pairs are herein. However, it was evident that some of the internal included; trips made may have been induced or resulted from hav- Have owners or managers who will permit the needed sur- ing proximate interacting land uses. The question asked veys to be conducted; whether the respondent would have made the trip being Be easy to conduct a large enough sample for an affordable discussed if the selected destination did not exist within cost (in 2006 dollars, each survey cost about $50,000 to set Legacy Town Center. A substantial number of respondents up and conduct and to summarize the resulting data); answered affirmatively--that is, they said they would not Be generally in the range of 300 to 500 acres or less; and have made the trip had it required travel outside Legacy Be economically successful (by appearance), be mature (i.e., Town Center. Hence, such a trip would not represent a fully occupied for at least a year), and be in an area that is reduction in external trips: it would be an addition--made mostly developed. internally. It is expected that NCHRP will turn over the results of this Lessons Learned project and its data to ITE for inclusion in its database. ITE is Several lessons were learned in this project that will be of also the body that issues recommended practices for this type interest to researchers and practitioners in this field. of methodology. Organizations that collect additional inter- nal capture data are encouraged to provide a copy of the data Detailed data are very scarce and expensive to produce. and analyses to ITE for further use and future refinement to There has been little willingness of sponsors to fund data- what was produced in this project. collection efforts since the advent of the current ITE esti- mation method and adoption of flat reduction percentages Recommended Changes to the by numerous agencies. Procedures Used in This Project Due to the shortage of data, there is significant apprehen- sion on the part of development review agencies about Based on the experience of collecting and using data follow- whether trip generation at MXDs is actually less than the ing procedures initially recommended for this project, four sum of its free-standing components--that is, if there is changes are recommended for consideration to improve the actually internal capture. quality and content of data: Owners/managers of some developments are reluctant to permit surveys. They have concerns about the interviews 1. Conduct inbound interviews in addition to exit inter- discouraging patrons from doing business at the MXD. In views. Although there is developer/manager resistance to all three pilot studies conducted for this project, permission inbound interviews, they would increase the accuracy of was gained to conduct only exit interviews--not inbound the survey data. Questions about the previous trip before interviews. This was based on owner/manager belief that the one being interviewed drew some illogical results and patrons would not be bothered after they had already done included many trips made before the peak period of inter- their business in a particular establishment where the inter- est. If the development owner/manager resists giving per- views would be conducted. mission, attempt to conduct inbound interviews in loca- Data clearly show that there is internal capture in the tions where business will not be impeded. Office building ranges previously documented.