The combination of increasing challenges in administering household travel surveys and advances in global positioning systems (GPS)/geographic information systems (GIS) technologies motivated this project. It tests the feasibility of using a passive travel data collection methodology in a complex urban environment, by developing GIS algorithms to automatically detect travel modes and trip purposes.

Momentum is growing for an ambitious round of investments in transportation projects in New
York City. At a time of fiscal crisis, and uncertainties over the direction of the economy in
Lower Manhattan and the city as a whole, new transportation infrastructure is increasingly being
seen as critical for the city?s future. Buoyed by calls from elected officials and civic and
business groups, a wide array of government agencies ? including the Metropolitan
Transportation Authority, the Port Authority, New Jersey Transit, the New York State

Momentum is growing for an ambitious round of investments in transportation projects in New
York City. At a time of fiscal crisis, and uncertainties over the direction of the economy in
Lower Manhattan and the city as a whole, new transportation infrastructure is increasingly being
seen as critical for the city?s future. Buoyed by calls from elected officials and civic and
business groups, a wide array of government agencies ? including the Metropolitan
Transportation Authority, the Port Authority, New Jersey Transit, the New York State