Transportation engineering, also known as transport engineering, is the application of technology and science principles to the planning, functional design, operation, and management of facilities for any mode of transportation in order to ensure the secure, reliable, rapid, comfortable, convenient, economical, and environmentally friendly transportation of people and goods. Transportation engineering's planning dimensions are related to aspects of urban planning and include technical forecasting decisions as well as political considerations. The estimation of trip generation (number of purposeful trips), trip distribution, and other technical aspects of passenger travel forecasting are typically done using an urban transportation planning model (destination choice, where the traveller is going). Other aspects of traveller decisions, such as auto ownership, trip chaining (the decision to connect individual trips together in a tour), and the option of residential or business venue, can be included in more sophisticated forecasting (known as land use forecasting). Since passenger trips often reflect the peak of demand on any transportation system, they are the subject of transportation engineering. While facility planning and design remain at the center of the transportation engineering industry, operations planning, logistics, network analysis, funding, and policy analysis are also essential to those employed in highway and urban transportation, according to details of the scope of various committees.