[CTPP] Journey to Work data

In looking at the journey to work data at all three levels (place, county and MSA level) for the Tulsa MSA, in short we observed the following - 1. A slight increase in commute time - between 7% & 8% from 1990 (as opposed to 16-20% increase in VMT over the same period). 2. With regard to the mode of transportation - Carpool showed an increase over '90 levels (1.4%) and transit commute trips declined. Several cities we looked at for comparison purposes showed similar trend. 3. Almost no increase in car ownership is also observed (percent households with 0, 1 and 2 plus cars remained same from 1990 to 2000). Possibly all of these are somewhat related - has anyone come up with this prediction with regard to an increase in carpooling over the past decade (any papers published or presented)? Is this a confirmed reversal in trend from 70s to 80s and 90s? I guess part of my question is to do with if transit's loss is carpools' gain? Viplav Putta Transportation Planning Division INCOG