This unique book is the first attempt to fully integrate automobile ownership (by fleet size and vehicle type) and vehicle use in an intertemporal setting which recognises the durable nature of automobiles using extensive longitudinal panel data on each household (over 5 years). The book presents: the theoretical and econometric development of a joint discrete-continuous choice longitudinal model system of household and automobile ownership and use, bringing together 9 years of research;the application of the model system for the period 1981-1985 in Australia;the forecasting of the model system up to 2020; particular emphasis on the development and application of a longitudinal data base which is unique to the topic - to capture the dynamic (intertemporal) impacts of technological change, life-style change, fuel prices etc.The book not only extends the reader's knowledge of the dimensions of automobile demand but it also adds important new ideas on handling dynamics of choice, as well as new empirical evidence on elasticities of demand for vehicles and vehicle kilometres. Energy and transport planning specialists will find the book essential reading.