The role of socialization has begun to attract attention in transportation planning. In
this study, we investigated the effects of socialization on travel in the context of a developing
country. We focused on university students’ activity-travel behavior as influenced by the level
and form of their socializing practices. We hypothesized that socialization would greatly affect
the number of side-trips students took while returning home after class. Data were collected at
pre-selected universities in Metro Manila. Path analysis results suggested that certain types of
socialization had significant effects on the frequency of participants’ side-trip as they were
returning home. Furthermore, social network size had a significant effect on patterns of afterclass
activity travel. Overall, the results suggest that socialization provides sound motivation
for trip generation and should be considered in transportation planning processes in developing
countries.