ABSTRACT
Some transportation data are best modeled by a system of interrelated equations. Examples include the interrelation of utilization of individual vehicles (measured in kilometers driven) in multivehicle households, the interrelation between travel time from home to an activity and the duration of the activity, the interrelation between the temperature at a sensor in a pavement and the temperature at adjacent sensors in the pavement, and the interrelation of average vehicle speeds by lane with the vehicle speeds in adjacent lanes. All of these examples produce interrelated systems of equations where the dependent variable in one equation is the independent variable in another.
