Subcommittee on Census
Data For Transportation Planning
The C2SS was a survey of 700K households designed
to test the operational feasibility of collecting long form-type data simultaneously,
but separately, from a decennial census. The first wave of C2SS data
was released at the statewide level in august 2001. Additional data
for most cities and counties of 250,000 or more people are scheduled for
release in the fall 2001, and winter 2002.
The 1990 data used here came from STF3 tabulations while the 2000 data
came from the Census 2000 Supplementary Survey (C2SS). The C2SS was
a survey of 700K households designed to test the operational feasibility
of collecting long form-type data simultaneously, but separately, from
a decennial census. The first wave of C2SS data was released at the
statewide level. Additional data for most cities and counties of
250,000 or more people are scheduled for release in the fall 2001, and
In 2000 the average travel time to work was 24 minutes 20 seconds as
compared to 22 minutes 23 seconds in 1990. A change of almost 2 minutes.
In 1990, nine states and the District of Columbia had higher travel
times to work than the national average. By 2000, this increased
by two states to 11, along with the District of Columbia.
Of the states with higher than average travel times, Hawaii dropped
off the list while West Virginia, Washington and New Hampshire were added.
West Virginia had the greatest travel time change at 4 minutes and 26
seconds followed by Georgia (4:14) and New Jersey (3:24).
New York continued to hold the top spot for the longest travel time
at 31 minutes 11 seconds followed by Maryland (29:10), New Jersey (28:41),
the District of Columbia (28:32) and Illinois (27:02).
The states with the fastest travel times continued to be South and North
Dakota at 15 minutes 34 seconds and 15 minutes 24 seconds respectively.
Of the modes used to go to work, driving alone continued to capture
the largest market share at 76.3 percent. Carpooling was second at
11.2 percent followed by transit (5 percent), other means (3.8 percent),
work at home (3.2 percent) and biking at four tenths of one percent.
In terms of actual numbers, carpooling continued the decline seen in
the 1980s with a 7.5 percent drop in the number of trips in 1990.
On the other hand, transit trips increased 7.7 percent over the 10-year
period (1990 to 2000). The transit increase is consistent with the
growth that has been reported by the transit industry.
Overall, Carpooling lost market share shrinking from 13.4 to 11.2 percent
of all work trips while Transit stayed about the same with an overall market
share of 5 percent.
Athough the sample is small (see notes below), it appears that both
bike trips and 'working at home' have increased ...stay tuned as more data
For More information and to get your own C2SS data see the Census
Bureau's American Factfinder
Comparisons to 1990 have some caveats.
Note: All estimates include statistical variability. No
statistical comparisons of 1990 Census and C2SS estimates taking this variability
into account have been made.
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Group quarters are not included in the 2000 data.
Travel time was top coded at 99 minutes in 1990 and 240 in 2000 (Census
staff notes this affected the national 2000 average travel time by almost
The points above include work at home as a travel mode when comparing
modal market shares.
Hosted by Ed Christopher