Civil Engineering Reference
In-Depth Information
Table 6.16 Changes in
private vehicle ownership
(1969
-
2000)
Year
Vehicles per driver
Average annual (%) change
over previous period
1969
0.70
-
1977
0.94
+4.3
1983
0.99
+0.9
1990
1.01
+0.3
2001
1.06
+0.4
Source
Reference [
9
], Table 1
Fig. 6.7 Average annual population changes in suburban areas (1950
2000).
Source
Calculated
-
from Reference [
3
], Fig. ES-1
Several key factors have in
fl
uenced a slower annual VMT growth in the 2000
-
2010 decade. These include: (1) a
flattening of the labor force participation rate
(Table
6.7
), (2) a near saturation of private vehicle ownership (Table
6.16
), and (3)
a decreasing annual share of population growth in suburban areas (Fig.
6.7
)
fl
where
automobile dependency is highest. In addition, the extended high levels of unem-
ployment due to the economic recession that began in 2007 (Table
6.17
), together
with unstable fuel prices (Table
6.18
), have reduced the VMT and its congestion
impact over the period.
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