There are many sources of information about Travel Demand Forecasting on the Internet. You might want to further your education by taking advantage of these resources.

Oregon Department of Transportation: Transportation Planning Site
http://www.odot.state.or.us/other.asp

Travel Model Improvement Program (TMIP)
http://www.bts.gov/tmip/

National Transportation Library: Planning and Policy
http://www.bts.gov/ntl/subjects/planning.html