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| FY2001 (Phase Two) Evaluation
The measurement team expanded upon the FY2000 evaluation during the FY2001 reporting year by developing a more inclusive and rigorous approach to measure the impacts of programs and services supporting alternative mode activity throughout the region. Primary areas of evaluation expansion are as follows:
- Assessing travel and emission impacts for commuters participating in compressed work week and telework programs;
- Incorporating new data sources for a more comprehensive assessment of impacts, including vendor/operator reports (MARTA Partnership Program, Cobb County Transit (CCT), Douglas County Rideshare, Metro Vanpool, and Georgia Building Authority) and federal employer self-reports (USEPA Clean Air Initiative Program);
- Expanding measures to evaluate performance, including "precursor" activities facilitating alternative mode use (see Performance Measure Continuum below); and
- Increasing the validity of the travel and emission impacts reported by calculating the number of commuters placed in alternative modes and the number of vehicle trips reduced for commuter placements.
Performance Measure Continuum
The Performance
Measure Continuum represents the range of impacts achieved
by the Atlanta TDM Framework. This continuum includes performance
measures that cover a progression of desired behavioral changes
commuters typically make before adopting commute alternatives.
At the far end of the continuum are the travel/emission impacts,
the ultimate desired outcome of the Atlanta TDM Framework.
Preceding these impacts (and at the beginning of the continuum)
are other "precursor" behavioral changes commuters typically
make before adopting commute alternatives (e.g., becoming
aware of the problem and solution, participating in a transportation
fair).
The performance measure continuum
is structured to reflect the relationships of the various
programs and services supporting the Atlanta TDM Framework
and how each contributes to the ultimate goal of generating
travel and emission impacts. The key FY2001 activities of
the Atlanta TDM Framework within the context of the newly
developed continuum can be found in the Resource
Library section of this website. The document is titled
FY2001 GDOT Final Report (see Chapter 3, Section
3). Presented below are some of the key findings from the
final two steps of the continuum, utilization and travel and
emission impacts.
Utilization
The impacts presented below include only those programs and services (i.e. data sources) the measurement team could accurately and cost-effectively measure for FY2001, and thus, are a conservative estimate of alternative mode activity in the metro Atlanta region.
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| Net FY2001 Commuter Placements/Users (10/01/00-09/30/01) |
| Alternative Modes |
New Users1 |
Retained Users2 |
Total Users |
| Carpool |
1,250 |
1,740 |
2,990 |
| Vanpool |
736 |
1,986 |
2,722 |
| Transit 3 |
10,330 |
5,739 |
16,069 |
| CWW |
158 |
19,791 |
19,949 |
| Telework |
906 |
6,587 |
7,492 |
| Total |
13,380 |
35,843 |
49,223 |
1 New users are the commuters who shift to a commute alternative after receiving assistance from a program or service supporting the Atlanta TDM Framework within a specified period of time.
2 Retained users are the commuters who were in an alternative mode prior to a specified period of time and are still in the same alternative mode.
3 Specified period of time is defined as the FY2001 evaluation year for all programs and services except the employer-based discount transit program. It is likely that many of the new transit users joined discount transit programs before FY2001.
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Travel and Emission Impacts
The NOx
and VOC emission reductions for the Atlanta TDM Framework
and supporting programs and services are presented below.
The emission reductions are based on the data sources and
resultant utilization impacts described above, and thus, are
a conservative estimate of the emission reductions achieved.
The FY2001 evaluation (travel and emission reductions) cannot be directly compared to the FY2000 evaluation. The FY2001 evaluation's enhanced measurement methodology includes additional data sources and refined standard factors and calculation methodologies.
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| Net FY2001 Emission Reductions by Mode (tons/day) (10/01/00-09/30/01) |
| Alternative Modes |
New Users1 |
Retained Users2 |
Total Users |
| NOx |
VOC |
NOx |
VOC |
NOx |
VOC |
| Carpool |
0.0139 |
0.0153 |
0.0089 |
0.0099 |
0.0228 |
0.0252 |
| Vanpool |
0.0346 |
0.0382 |
0.0649 |
0.0716 |
0.0996 |
0.1099 |
| Transit 3 |
0.1361 |
0.1502 |
0.0756 |
0.0834 |
0.2118 |
0.2336 |
| CWW |
0.0008 |
0.0009 |
0.1039 |
0.1139/font> |
0.1047 |
0.1148 |
| Telework |
0.0754 |
0.0832 |
0.0132 |
0.0146 |
0.0887 |
0.0978 |
| Total |
0.2609 |
0.2879 |
0.2666 |
0.2934 |
0.5276 |
0.5813 |
1 New users are the commuters who shift to a commute alternative after receiving assistance from a program or service supporting the Atlanta TDM Framework within a specified period of time.
2 Retained users are the commuters who were in an alternative mode prior to a specified period of time and remain in the same alternative mode.
3 Specified period of time is defined as the FY2001 evaluation year for all programs and services except the employer-based discount transit program. It is likely that many of the new transit users joined discount transit programs before FY2001.
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| Net Emission Reductions by Mode (kilograms/day)(10/01/00-09/30/01) |
| Alternative Modes |
New Users1 |
Retained Users2 |
Total Users |
| NOx |
VOC |
NOx |
VOC |
NOx |
VOC |
| Carpool |
12.60 |
13.90 |
8.11 |
8.95 |
20.71 |
22.85 |
| Vanpool |
31.45 |
34.70 |
58.94 |
65.03 |
90.39 |
99.73 |
| Transit 3 |
123.50 |
136.26 |
68.61 |
75.70 |
192.10 |
211.95 |
| CWW |
0.75 |
0.83 |
94.26 |
103.32 |
95.01 |
104.15 |
| Telework |
10.83 |
11.95 |
78.79 |
86.93 |
89.63 |
98.89 |
| Total |
179.12 |
197.64 |
308.71 |
339.93 |
487.84 |
537.57 |
1 New users are the commuters who shift to a commute alternative after receiving assistance from a program or service supporting the Atlanta TDM Framework within a specified period of time.
2 Retained users are the commuters who were in an alternative mode prior to a specified period of time and are still in the same alternative mode.
3 Specified period of time is defined as the FY2001 evaluation year for all programs and services except the employer-based discount transit program. It is likely that many of the new transit users joined discount transit programs before FY2001.
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