Transferability and updating of disaggregate travel demand models
Two decades after CATS, for example, the London study followed essentially the same procedure, but in this case, researchers first divided trips into those made in the inner part of the city and those in the outer part.
This procedure was followed because it was thought that income (resulting in the purchase and use of automobiles) drove mode choice.
At first, the CATS studied the diversion of auto traffic from streets and arterial roads to proposed expressways.
This paper provides an extensive review of the literature on spatial transferability of travel forecasting models.