Course Documents -> Week 4 -> A good Case Study in Travel Behavior
The authority on trip generation most recent study suggests that the average individual point to point journey for US households is 9.7 car trips per day.

In class I used a figure of 4.3 round trips a day which is close to the 9.7/2 figure from the most recent study.



http://www.metrocouncil.org/planning/transportation/TBI.pdf