The Origin and Destination studies give the idea of the number of vehicular traffic , their origin and ______________ in each zone of study.

Transportation engineering or transport engineering is the application of technology and scientific principles to the planning, functional design, operation and management of facilities for any mode of transportation in order to provide for the safe, efficient, rapid, comfortable, convenient, economical, and environmentally compatible movement of people and goods transport. (Source: Wikipedia)

Transportation engineering is also a part of Urban planning.