1. The quantity (of transportation) desired. 2. In an economic sense, a schedule of the quantities ((of travel) consumed at various levels of price or levels of service offered (by the transportation system). (TRB)
1. The quantity (of transportation) desired. 2. In an economic sense, a schedule of the quantities ((of travel) consumed at various levels of price or levels of service offered (by the transportation system). (TRB)