01660363

Component

The predominant method for estimating transportation impacts of new land-use development is the Institute of Transportation Engineers’ Trip Generation Handbook (2014) and Manual (2012). While several existing and on-going studies focus other relevant issues—e.g., lack of sensitivity to urban context or demographics—many of the new methods developed continue to rely on ITE’s original data as a baseline for adjustment. This manuscript focuses on ITE’s suburban data, assessing two specific issues raised in previous research: (a) does the age of the data significantly relate to changes in vehicle trip generation rates?; and (b) what are the costs and benefits associated with ITE’s extensive land-use taxonomy? This analysis uses ITE’s Handbook vehicle trip generation data to focus on their largest general land-use categories—retail and services.The results indicate a significant and positive relationship between the age of data and vehicle trip generation rates for eight land-use categories—the only ones with a sample of more than 50 observations. Additionally, the results indicate a significant—but small—improvement in explaining variation of rates between ITE’s taxonomy (64 categories) and an aggregated taxonomy (3 categories). The costs associated with the up-keep of ITE’s extensive retail and service taxonomy—maintaining a sample size of four data points and decommissioning older data—is approximated at $2.1-2.7 million dollars every 10 years, more than 22 times the cost of maintaining the proposed “aggregated” taxonomy. The conclusion includes a discussion of results, limitations, and recommendations for practice.

This paper was sponsored by TRB committee ADD30 Standing Committee on Transportation and Land Development.

18-02111

English

9p

2018

Transportation Research Board 97th Annual Meeting

Digital/other

References; Tables

Environmental impact analysis; Handbooks; Land use; Manuals; Suburbs; Taxonomy; Trip generation

Institute of Transportation Engineers; Trip Generation Handbook. Third Edition (2014); Trip Generation Manual. Ninth Edition (2012)

Environment; Planning and Forecasting; Transportation (General)

Transportation Research Board Annual Meeting 2018 Paper #18-02111

TRIS, TRB, ATRI

Jan 8 2018 10:31AM