Evolving ITE trip generation handbook

This paper outlines a new perspective on data collection to inform site-level trip generation studies with amendments to ITE's Trip Generation Handbook in mind. The data collection proposed here is informed by the authors' experiences in a study that aimed to adjust trip generation rates for an urban context. In this study, a consistent, reliable method for adjusting ITE's trip generation rates to account for increased nonautomobile travel in different urban contexts was developed. On the basis of these experiences, the design presented here proposes more emphasis on collecting information on person counts and on how those person trips are distributed across various modes, including walking, cycling, and transit. This paper advocates a move from the vehicle-based counts used historically in these studies to a focus on how new development affects all users of transportation systems.