Civil Engineering Reference
In-Depth Information
Table 6.11 Change in average daily person miles of travel per person (1983
-
2001)
Age
1983
2001
Average yearly change: 2001
1983 (miles/year)
-
Under 16
16.2 miles
24.5 miles
+8.3/18 = 0.46
16
20
22.2
38.1
+15.9/18 = 0.88
-
35 31.1 45.6 +14.5/18 = 0.81
36
-
65 29.2 48.8 +19.6/18 = 1.09
Over 65 12.0 27.5 +15.5/18 = 0.86
Total 25.5 40.2 +14.7/18 = 0.82
Source
Reference [
9
], Table 14
—
2001 NHTS summary of travel trends
21
-
Table 6.12 Rate of annual increase in per capita daily person miles of travel (1983
2001)
-
Age
1983
1990
1990
1995
1995
2001
1983
2001
(miles/year)
-
-
-
-
Under 16
+0.56 miles/year
+1.00 miles/year
0.8 miles/year
+0.46
−
16
20
+1.74
+0.00
+0.28
+0.88
-
21
-
35
+0.77
+1.90
−
0.07
+0.81
36
65
+0.54
+1.00
+0.62
+1.09
-
Over 65
+0.31
+1.20
+0.52
+0.86
Total
+1.4 miles/year
+0.76 miles/year
+0.25 miles/year
+0.82
Source
Reference [
9
], Table 14
1990 to 1995; and it slowed down to an average increase of 0.25 miles per year
from 1995 to 2001 (see Sect.
6.3
, for a discussion of this plateau effect).
6.2.3.5 Growth of Households and Household Vehicles Exceeding
Population Growth
As the size of households decreased (e.g., the number of households grew faster
than the population
see Table
6.13
), the use of private vehicles for daily travel
almost doubled from 1969 to 2001 (Table
6.14
).
—
Table 6.13 Daily vehicle
trips per person and
household size: 1969
Year
Vehicle trips per
person
Persons per
household
2001
-
1969
1.21
3.16
1977
1.40
2.83
1983
1.51
2.69
1990
2.22
2.56
1995
2.42
2.63
2001
2.31
2.58
Ratio of 2001 to
1969
1.91
0.83
Source
Reference [
9
], Tables 1 and 2
