28 May
2002
28 May
'02
6:22 p.m.
I would guess that you are not seeing a switch from transit to carpool --
but rather the effect of new growth in the suburbs, poor transit and more
carpooling, while the transit served areas may not have declined in
percentage use, but are a smaller part of your region.
The change on travel time is unusually large compared with previous 10-yr
periods (in most cities) - suggests a methodological problem, or change.
The larger increase in VMT is normal -- suburban growth - faster travel
means more distance (VMT) possible in the same time.
Keith Lawton
At 02:20 PM 5/28/02 -0500, Putta, Viplava wrote:
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