Land use transport interaction (LUTI) models are often developed to model the interaction between the land use and transport systems for relatively large-scale spatial developments, like new residential or office areas, new main roads, or railway lines. In this paper I argue that we need a next generation of LUTI models that model trends such as peak car; decline in population, shops, services, etc.; impact of information and communications technology (ICT) on activity patterns and travel; and cycling policies. The current generation of LUTI models cannot adequately answer the policy questions raised by these trends. However, a major problem is that the future of these trends is uncertain, and we lack empirical research into the dynamics between these trends and their wider impact on land use and transport systems. Nevertheless, LUTI models can, by utilizing what-if calculations, help explore future trends and their implications. Other challenges for LUTI models include the calculation of a wider set of accessibility indicators, the inclusion of interactions between key actors in the transport and land-use system-serious gaming may prove a useful way to explore these interactions-and the development of dynamic visualizations.
IntroductionThe traditional four-step transport models have been in use for several decades, providing insights into the expected travel behavior and traffic flows of candidate transport policy options, examples being new roads or rail lines, as well as options for land-use changes such as the building of new residential areas or office locations (e.g., Ortuzar and Willumsen 2011). In these models the transport system does not have an impact on land use, which is often in contrast to reality, as expressed in the saying: In the long term, every light rail line is located correctly. That is, the new light rail line, and in particular its stations, will fuel land-use changes in the vicinity of stations. In addition, the land-use system does not impact transport-both are considered exogenous. To deal with such impacts, mainly the impact of the transport system on land use, so called land use transport interaction (LUTI) models were developed more than two decades ago (e.g., Wegener and Fürst 1999;Hunt, Kriger, and Miller 2005;Wegener 2011). These models were mainly developed to provide answers to policy-relevant questions related to