Short and Sweet:

Analysis of Shorter Trips Using National Personal Travel Survey Data

This paper summarizes information on shorter trips, based on 2009 National Household Travel Survey data. 

This analysis indicates that a significant portion of total personal travel consists of shorter trips. About 10% of reported trips are a half-mile or less, about 19% are a mile or less, and 41% are three miles or less. Since shorter trips tend to be undercounted, the actual share of short trips is probably higher than these figures indicate.

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