Civil Engineering Reference
In-Depth Information
21.2.1 Overview
Table
21.1
shows six types of strategies supported by employers for reducing
vehicle trips to work: transit enhancements, restricted parking, parking fees,
transportation services, modal subsidies,
telecommuting, and compressed work
weeks.
Trip reduction comparisons are provided for programs that incorporate high,
medium, and low levels of employer support. The numbers in parenthesis represent
the sample sizes used in calculating the average vehicle-trip reductions. Overall, all
programs reported a 16.9 % reduction in vehicle trips. The
row in the table
shows that, employers who provided a high level of support achieved a 19 %
vehicle trip reduction (VTR) as compared with about 15
“
all
”
16 % for lower levels of
-
support.
Table 21.1 Vehicle trip reduction percentages related to employer support actions and levels of
support
Other condition
VTR by level of overall employer support (sample size)
High
Medium
Low
All
All
19.0 % (32)
15.9 % (33)
15.0 % (17)
16.9 % (16.9)
Transit availability
High
28.4 % (10)
28.2 % (6)
24.3 % (8)
26.0 % (24)
Medium
10.1 % (5)
15.3 % (10)
3.2 % (3)
11.9 % (18)
Low
15.9 % (17)
13.6 % (17)
8.6 % (6)
12.3 % (40)
Restricted parking
Yes
29.9 % (12)
23.8 % (11)
18.0 % (11)
24.1 % (34)
No
12.5 % (20)
12.0 % (22)
9.6 % (6)
11.9 % (48)
Parking fees
Yes
24.4 % (14)
27.3 % (7)
22.8 % (9)
24.1 % (30)
No
12.5 % (18)
12.0 % (26)
9.6 % (8)
11.9 % (52)
Transportation services
Yes
26.5 % (15)
15.5 % (14)
24.2 % (5)
21.6 % (34)
No
12.4 % (17)
16.2 % (19)
11.2 % (12)
13.6 % (48)
Modal subsidies
Yes
20.5 % (26)
19.8 % (25)
16.9 % (13)
19.5 % (64)
No
12.7 % (6)
3.7 % (8)
9.1 % (4)
7.9 % (18)
Telecommuting
Yes
16.6 % (10)
14.6 % (6)
28.2 % (1)
16.5 % (17)
No
20.1 % (22)
16.2 % (27)
14.2 % (16)
17.1 % (65)
Compressed work week
Yes 19.7 % (15) 21.5 % (10) 8.3 % (3) 19.5 % (28)
No 18.4 % (17) 13.5 % (23) 16.5 % (14) 15.8 % (54)
Source
References [
1
], pp 19
-
20, Table 19.1 and [
16
]
©
National Academy of Sciences,
Washington, DC. Reproduced with permission of the Transportation Research Board.
