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144 Guidebook for Conducting Airport User Surveys shipments or cargo activity at their facility, it is possible to construct a survey in the form of an interview. Using the survey purpose as a base, a series of questions can be constructed to form a structured interview to be conducted with all, or selected, air cargo operators at the airport. Each selected shipper and forwarder would be approached to participate, and an interview con- ducted at a convenient time. The cost and duration of such a survey would depend on the number of interviews to be conducted. As an alternative or supplementary method, it may be possible to conduct driver interviews at a roadside location near the cargo facility. This survey method was adopted for the extensive survey performed at Toronto Pearson International Airport in 2005 (the questionnaire used is included in Appendix K). The actual methodology is similar to the roadside interviews used by state agen- cies, and the experience of such agencies would be valuable in the design of a roadside intercept interview at an airport. The numbers of truck movements by truck category can be collected through observational studies. Such a study will not provide the detailed data on loaded weight and origin and destina- tion, but it would act as a census of the volume of truck movements. 10.4 Summary Air cargo surveys may be required when the available data sources do not provide the level of information needed. Waybill data would be a superior data source for analysis, but there is cur- rently no easy way to access detailed waybill data for air cargo shipments and freight forwarding companies are reluctant to release this information. There is limited experience in conducting air cargo truck interviews, which may be the best approach to getting access to waybill data.