Title: Implications of Trip Generation Rate Changes over Time
Abstract: An investigation of two North Carolina case studies assesses the impacts of changes in trip generation rates over time. The first case study considers a regional travel demand model and the second a traditional trip based travel demand model for a small urban area. The evaluation includes three different sets of trip generation rates for the regional model and four trip rate sets for the small urban area. The trip rate sets describe rate changes from five different household travel surveys, three from Baltimore, Maryland administered in 1977, 1993, and 2001; and the other two from the Research Triangle region of North Carolina administered in 1995 and 2006. The change in total trip rates ranged from ten to twenty percent depending on the years compared, a statistically significant change considering the t-statistic at a 95% confidence level. Trip generation, system level, and project performance measures quantify the effects of the rate changes on the model results. The results of this investigation show that trip rates that do not remain stable over time can have implications for system level and project level planning, resulting in unexpected changes in vehicle miles traveled and associated emissions, transit ridership, traffic forecasts, and local travel.
Publication Year: 2013
Publication Date: 2013-01-01
Language: en
Type: article
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