Travel times to work from the 2000 Census show an increase in average commuting times that is difficult to reconcile with the viewpoint expressed in earlier literature that suburbanization has provided a solution by acting as a traffic "safety valve", preventing a "traffic doomsday" from...

We develop a general space–time filter applied to panel data models in order to control for heterogeneity as well as both time and spatial dependence. Treatment of initial period observations is analyzed when the number of time periods is small. A second issue relates to a restriction implied...