Presentation at the Association of American Geographers' annual meeting, April 9-13, Los Angeles, CA. Session: Cities, Transportation and Sustainability.
Abstract:
As environmental impacts from automobiles have grown, more research is needed to determine what social and policy forces can influence transportation ecoefficiency (TE). TE is the environmental impact per unit of travel, including accessibility and mobility, and it is measured by proxy as the index of four z-scores: percent drive-alone commuting (sign reversed); percent commuting by public transit; percent of commuters walking or riding a bicycle; and population density. A higher TE index indicates more ecoefficient transportation, compared to the average. This study presents a macro-level analysis of institutional and structural predictors of TE in a sample of 225 United States Metropolitan Statistical Areas. Specifically, Ordinary Least Squares regression with robust standard errors points to several conclusions. A New Political Culture, measured by education and income (real per capita income and % change in real per capita income) increases TE, although professional status could reverse this effect. High and rising incomes interact to increase TE, with an effect size over 10 times larger than other effects. State-mandated urban growth management increases TE, demonstrating the beneficial effects of comprehensive planning. This is enhanced by higher incomes, and the combination of high incomes and state-mandated planning also has an effect size over 10 times larger than other effects. Percent African American has a quadratic influence, presumably due to the effects of tolerance and racial threat. Overall, this analysis demonstrates that macro-level social processes, including race, comprehensive planning, and the presence of a new political culture, have a significant impact on TE.
Transportation Ecoefficiency: Social and Political Forces for Change in U.S. ...Anna McCreery
Ph.D. Exit Presentation: an overview of the results of my dissertation (revised from an earlier presentation at the 2012 Association of American Geographers Annual Meeting).
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Istanbul IETT Professional Development Workshop, #4 of 6_Transit & Land UseVTPI
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Presenter: Todd Litman, Victoria Transport Policy Institute
Assistant: Aysha Cohen, UCLA Institute of Transportation Studies Scholar
Presentation Date: June 15, 2015
Istanbul IETT Professional Development Workshop, #1 of 6_Foundations of Publi...VTPI
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Presenter: Todd Litman, Victoria Transport Policy Institute
Assistant: Aysha Cohen, UCLA Institute of Transportation Studies Scholar
Presentation Date: June 14, 2015
Transportation Ecoefficiency: Quantitative Measurement of Urban Transportatio...Anna McCreery
Presentation at the 2012 Association of American Geographers Annual Meeting. Paper Session: Modelling and Visualizing Travel Behavior II (Sponsored by Transportation Geography Specialty Group).
Transportation Ecoefficiency: Social and Political Forces for Change in U.S. ...Anna McCreery
Ph.D. Exit Presentation: an overview of the results of my dissertation (revised from an earlier presentation at the 2012 Association of American Geographers Annual Meeting).
Urban Transportation Ecoefficiency: Social and Political Forces for Change in...Anna McCreery
This document is an executive summary of my dissertation, discussing policy and social forces that influence the ecological efficiency of urban transportation.
Istanbul IETT Professional Development Workshop, #4 of 6_Transit & Land UseVTPI
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Presenter: Todd Litman, Victoria Transport Policy Institute
Assistant: Aysha Cohen, UCLA Institute of Transportation Studies Scholar
Presentation Date: June 15, 2015
Istanbul IETT Professional Development Workshop, #1 of 6_Foundations of Publi...VTPI
Istanbul IETT Professional Development Workshop, #1 of 6, Foundations of Public Transport Planning
Presenter: Todd Litman, Victoria Transport Policy Institute
Assistant: Aysha Cohen, UCLA Institute of Transportation Studies Scholar
Presentation Date: June 14, 2015
Transportation Ecoefficiency: Quantitative Measurement of Urban Transportatio...Anna McCreery
Presentation at the 2012 Association of American Geographers Annual Meeting. Paper Session: Modelling and Visualizing Travel Behavior II (Sponsored by Transportation Geography Specialty Group).
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The international-dimension-of-european-urban-policyOECD Governance
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A brief overview of the importance of active transportation and its place in rural communities. This presentation is a class assignment for EDRD*6000 at the University of Guelph
The perception of commuting by bike may be a more important factor than perceived bike safety when deciding how to commute. To move more recreational bikers to commute via bike, changing people’s perception of biking as not only a recreational activity, but also a commute mode, may be a useful strategy.
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For more information, visit www.saxinstitute.org.au.
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Dr. Ralph Buehler: “Making the National Capitol Region the Next Cycling Capit...Tina_Whaley
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House Parties for Energy Efficiency: Outcomes of Community Organizing for Ene...Anna McCreery
Abstract:
Proponents of community organizing expect it to achieve broad goals such as empowerment and solidarity, local policy changes and community improvement. However, the specific outcomes of community organizing are not well-understood. What are the impacts of community organizing, in terms of specific and measurable outcomes related to the goals of a given campaign? This paper describes the local impacts of a Chicago-area community organizing campaign for energy efficiency in terms of the number of people that organizers connected with, growth of the campaign and completed energy efficiency retrofits. Energy efficiency program implementers, Elevate Energy, engaged in a deep organizing campaign involving community meetings and house parties. The goal was to empower communities and homeowners to control their energy bills by taking advantage of energy efficiency rebates and programs to invest in their homes; by leveraging community-based social networks and classic organizing tactics the campaign generated 3,000 single-family retrofits in one year. By analyzing the community organizing process and subsequent retrofits, this case study describes a local impact of building strong relationships and leveraging community social networks to support a concrete goal. Results suggest that energy efficiency programs could expand their reach by making geographically-situated personal connections, and by utilizing the techniques of community organizing and social movements. Further research evaluating different outcomes of community organizing in different geographic contexts would enhance our understanding of the impact of such efforts for community empowerment, social movement mobilization, and more concrete goals like energy efficiency.
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2. Measuring Transportation
Building
smarter cities requires good
research on transportation
Many micro-level studies in the literature
Macro-level research less well
established
Thismacro-level study investigates
broad social forces that impact local
transportation
3. Transportation Ecoefficiency
Environmental impact of
transportation, per unit of travel
Measured by proxy as the index of:
Population density1
% of commuters driving to work alone
(sign reversed)
% of commuters taking public transit
% of commuters walking or bicycling
1
Cervero 2007, Ewing and Cervero 2010, Naess 2006
4. Measuring TE: Pop. Density
Proxy for travel distance1
Associated with other built
environment features that affect travel 2
1
Ewing and Cervero 2010
2
Cervero 2007, Ewing and Cervero 2010, Naess 2006
5. Measuring TE: Commuting
Commuting:
A major share of personal travel
The most basic and fixed form of daily
travel
Likely to co-vary with other trips 1
Different commute modes have vastly
different environmental impacts:
Driving alone is very eco-inefficient
Public transit, walking, and cycling are
generally more ecoefficient modes
1
Lee et al. 2009; Naess 2006
6. Measuring TE: Data & Sample
Sample: 225 U.S. Metropolitan
Statistical Areas (MSAs), from 1980 to
2008
Source: Census data and American
Community Survey
7. TE in US Metro Areas
For 225 U.S. MSAs:
1980 2008
Variable
mean mean
Population Density* 320.3 360.0
Commuters driving 67.9% 78.2%
Commuters taking transit 3.21% 2.16%
Commuters walking/bicycling 6.40% 3.35%
TE Index 0.280 -0.204
* People per square mile
8. TE Trends: Commuting
100%
16.26%
90% 22.48%
other 3.35%
other
2.16% walk
80% 6.40%
transit bike
walk
3.21
70% bike
transit% 78.23%
60% 67.91% drive
drive
50%
1980 2008
Other Modes
% of commuters walking/bicycling
% of commuters taking public transit
% of commuters driving alone
9. TE Trends: the index
Change in average TE score:
0.6
0.5
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
1980 1990 2000 2008
Mean 0.504 -0.068 -0.227 -0.211
TE index
10. Analyzing TE: data & methods
Sample: 225 U.S. Metropolitan
Statistical Areas (MSAs)1
Dependent variable: TE score, 2008
Analysis: Ordinary Least Squares
regression with robust standard errors,
predicting 2008 TE from various
independent variables (measured
around 1980). Controls for 1980 TE.
1
Data sources: U.S. Census, American Community Survey, National Historical GIS, and others
11. Results: New Political Culture
New Political Culture theory: beneficial
effects of educated professionals with
high and rising incomes1
Variable Coef. Beta
% prof / tech workers -0.04*** -0.31
% college grads 0.58*** 0.24
real income per capita 1.64*** 0.30
% change in real income per
capita 0.75** 0.09
* p<0.05 ** p<0.01 *** p<0.001
1
Boschken 2003; Clark & Harvey 2010; DeLeon & Naff 2004
12. Results: Planning
State-mandated comprehensive
planning is expected to increase TE 1
State policies requiring coordinated urban
growth management2 should increase TE
State mandated planning is more likely to
be enforceable
1
Cervero 2002, Ewing and Cervero 2010, Filion and
McSpurren 2007, Handy 2005, Quinn 2006
2
Yin and Sun 2007
14. Results: Race
Race should impact local policy,
housing, etc., and therefore also TE
White Flight could reduce TE
But….theory does not predict direction
of influence. Interpretation is tentative.
Variable Coef. Beta
% African American 0.100** 0.12
% African American, squared -0.001** -0.22
* p<0.05 ** p<0.01 *** p<0.001
16. Results: Census Region
Westernregion showed significantly
higher TE: coef. = 0.42***, beta = 0.22
Includingcensus region altered the
significance of other variables
Indicating
that other regional differences
affect what factors influence TE
Culture? Climate?
17. Results: Interactions
Variable Coef. Beta
Real income per capita * % 5.20*** 7.74
change in real income per
capita
Real income per capita * 0.60* 6.04
State-mandated urban growth
management
* p<0.05 ** p<0.01 *** p<0.001
18. Results: Predictive Power
1
0.98
0.96
0.94
0.92
0.9
0.88
0.86
0.84
0.82
0.8
High * Rising Income *
Base Model
Incomes Planning
R-squared 0.872 0.882 0.879
19. Limitations
Qualitative differences between bus and rail
transit (in service quality and perceptions)
Interpretation of the effect of race is very
tentative
Data limitations and imperfect measurement
of:
Planning (preferably regional planning)
Non-significant variables
20. Main Contributions
The TE concept and metric is a useful
empirical tool1
Macro-level social forces impact urban
transportation in significant and under-
studied ways
Grand sociological theories can lead
to testable hypotheses and new
insights about transportation
1
McCreery forthcoming in Environment and Planning A
21. Recommendations for Practice
Comprehensive planning can achieve real
results, especially with enforceable plans
Multi-pronged sustainability efforts are worth
pursuing:
well-chosen investments in a strong, green
economy might have indirect transportation
benefits
Influenceof planning plus higher incomes is
dramatically larger than the effects of
demographic and other factors that are
beyond the influence of planners
22. Acknowledgements
Funding & Resources
Ohio State University Dept. of Sociology
Ohio State University Environmental Science
Graduate Program
The Fay Graduate Fellowship Fund in Environmental
Sciences
Colleagues
Dr. J. Craig Jenkins
Dr. Ed Malecki
Dr. Maria Conroy
Department of
SOCIOLOG
23. References
Boschken H.L. 2003. “Global Cities, Systemic Power, and Upper-Middle-Class Influence.” Urban
Affairs Review 38(6): 808-830.
Cervero, R. 2002. “Built environments and mode choice: toward a normative framework.”
Transportation Research Part D- Transport and Environment 7(4): 265-284.
Cervero, R. 2007. “Transit-Oriented Development’s Ridership Bonus: A Product of Self-Selection
and Public Policies” Environment and Planning A 39: 2068-2085.
Clark, T.N. and R. Harvey. 2010. “Urban Politics” pp. 423-440 in: Kevin T. Leicht and J. Craig
Jenkins, eds. Handbook of Politics: State and Society in Global Perspective New York: Springer.
DeLeon, R.E. and K.C. Naff. 2004. “Identity Politics and Local Political Culture: Some
Comparative Results from the Social Capital Benchmark Survey” Urban Affairs Review 39(6):
689-719.
Ewing, R, and R. Cervero. 2010. “Travel and the Built Environment: A Meta-Analysis” Journal of
the American Planning Association 76(3): 265-294.
Filion, P. and K. McSpurren. 2007. “Smart Growth and Development Reality: The Difficult Co-
ordination of Land Use and Transport Objectives” Urban Studies 44(3): 501-523.
Handy, S., L. Weston, and P. Mokhtarian. 2005. “Driving by choice or necessity?” Transportation
Research Part A- Policy and Practice 39(2-3): 185-203.
Lee, B., P. Gordon, H.W. Richardson, and J.E. Moore II. 2009. “Commuting Trends in U.S. Cities in the
1990s” Journal of Planning Education and Research 29(1): 78-89.
McCreery, A.C. Forthcoming. “Transportation Ecoefficiency: Quantitative Measurement of Urban
Transportation Systems with Readily Available Data.” Environment and Planning A.
Naess P. 2006. “Accessibility, activity participation and location of activities: Exploring the links
between residential location and travel behaviour” Urban Studies 43(3): 627-652.
Quinn, B. 2006. “Transit-Oriented Development: Lessons from California” Built Environment
32(3): 311-322.
Yin, M., and J. Sun. 2007. "The Impacts of State Growth Management Programs on Urban
Sprawl in the 1990s" Journal of Urban Affairs 29(2): 149-179.
I will begin this presentation by discussing the measure I’ve constructed to assess Transportation Ecoefficiency of urban areas by proxy. I will briefly discuss TE trends in US metro areas. I will finish by presenting the results of my analysis of social and political drivers of metropolitan TE.
Given the contribution of transportation to various environmental problems, we need a lot of research (a lot more, really) on transportation systems and how to improve them to work better for people and the environment. Although there are many great studies in the literature using micro-level details of transportation systems, there are fewer studies of macro-level processes. This is an important gap in the literature, and I aim to fill that gap with a macro-level study of broad social and political forces that help determine urban transportation’s environmental effects.
Transportation ecoefficiency (TE): a proxy for the environmental impact transportation, per unit of travel. A proxy measure is reasonable because no direct measure of ecological impacts could capture the widely varying effects of transportation on climate, hydrologic systems, air quality, and other ecological system . A proxy measure is more useful for holistically assessing transportation (a single metric can proxy a variety of environmental effects). Previous research has demonstrated the close connection between these factors and transportation’s environmental impacts.
Pop Density: approximates likely travel distances. Other lit. shows that this is a reasonable approach. Previous research has connected higher density with lower gasoline consumption (Newman and Kenworthy 1989) and transportation energy use (Naess 1996). Lower pop. density implies greater indirect impacts, due to more extensive road networks. 1. Ewing & Cervero 2010: a meta-analysis of transportation and built environment. Trip distance is primarily a function of the built environment, and trip lengths are shorter with higher densities. 2. Naess 2006: pop. density has no significant effect on commute distance in Copenhagen net of other built environment variables, but higher densities occur in areas with other features that reduce commute distances. Pop. density is thus a proxy for other built environment features that influence travel behaviors and trip distances.
Commuting: is the most basic daily travel, co-varies with other trips, etc. Driving alone: highly eco-inefficient, so its sign is reversed Public transit varies in ecoefficiency but is usually much more ecoefficient than driving alone Walking/bicycling have near-zero environmental impacts. They’re not strongly correlated with public transit use, and land use features that encourage them are different. A thorough lit. review indicates that the built environment and travel modes as the primary determinants of transportation’s environmental impact and ecoefficiency . To sum up: Taken together, these 4 components can be used as a proxy for the overall ecoefficiency of a given transportation system, by giving a broad overview of how people travel. To construct this measure, average the z-scores of the 4 components (with the sign reversed for the drive-alone commuting z-score). This captures important differences in the systemic environmental impact of transportation in a way that is effective for analyzing the higher-level social processes that influence transportation policies and practices.
Cronbach’s alpha for the 2008 index is 0.779, indicating high internal consistency within the metric. NOTE: The index means here were calculated using means and standard deviations from all 225 MSAs in both years, for comparison purposes.
This is a huge increase from 1980-2008 in drive-alone commuting, at the expense of more ecoefficient modes. Drive-alone commuting increased by >10%, walking and bicycling commuting was ~cut in half. Note: The “other modes” category includes things like working at home, commuting by taxi, motorcycles, and a number of others. Their degree of ecoefficiency is less clear in comparison to the modes that are included. So the overall picture is one of increased driving alone and declining TE. This overall decline in average TE across US MSAs can be seen easily when looking at the TE index score, which declines by ~half a standard deviation from 1980-2000. Most of this trend is driven by increases in drive-alone commuting, at the expense of transit and walking or bicycling..
The overall TE index shows a clear pattern of change over time. Z-scores for these indices were calculated using means and standard deviations from the full sample of 225 US MSAs in all 4 census years. The main point here is that the overall decline in average TE across US MSAs can be seen easily when looking at the TE index score, which declines by >half a standard deviation from 1980-2000. The TE index shows a clear trend over time, that corresponds with the ecoefficiency of urban transportation. This information can then be used to analyze the drivers of this trend. However, despite this clear trend there is variation between metro areas. My analysis investigates that variation.
For this analysis, I used OLS regression with robust standard errors to predict 2008 TE in US MSAs ( heteroskedasticity problems that ruled out standard OLS regression ) . The analysis is a lagged panel design , predicting 2008 TE index while controlling for the 1980 index. (An alternative model specification was tested, predicting change in TE. This change model’s results did not differ substantively from those presented here, and produced r-squared values above 0.5.) Independent variables: social/demographic, economic, and political variables measured in or near 1980, and a control for the starting point (1980 TE). This long time lag is effective because many of the factors that determine travel behavior change slowly .
The New Political Culture theory is similar to Richard Florida’s Creative Class and Herman Boschken’s theory of Upper-Middle Class influence. In short, these theories predict that the presence of certain kinds of people will affect the local political scene, and lead to an emphasis on public amenities like public transit, aesthetic investments, and similar things. So a “new political culture” should be associated with increased TE. Mostly, that’s what my results show. NOTES FOR ME: These results are from model 2, the pared down full-U.S. model with regional controls. Data: % Professional/Technical Occupations = % of workers in Professional/Technical occupations (excluding sales) % College Graduates (logged) = % over age 21 with a college degree Real income per capita, 1979 (logged) = Real income per capita, 1979 (2005 dollars) % real per capita income change, 1979-1989 (logged) = % change in Real per capita income, 1979-89 (2005 dollars)
Planning literature indicates that coordinated land use and transportation planning at the regional scale should improve planning outcomes , and therefore TE. However, there not much research on the outcomes of regional planning. To test the effects of regional planning I used a quantitative measure of state-mandated urban growth management (in other words, the state requires metro areas to engage in growth management , which is a kind of comprehensive planning). I chose state planning mandates mainly because state-mandated planning is more likely to be “planning with teeth”. MPOs without state mandates tend to be advisory bodies , and they’re less likely to have an impact because their recommendations aren’t enforceable. In general voluntary or advisory policies are generally less effective at achieving real changes. Image source: http://plannersweb.com/topics/basic-tools/comprehensive-planning/
First, state-mandated urban growth management does have a significant, positive effect. This is a small effect, but interaction effects that make it more interesting. NOTES FOR ME: These results are from model 1, the pared down full-U.S. model without regional controls (since controlling for census region masks the effect of state-mandated urban growth management) Data: State-mandated urban growth management = State mandates for urban growth management and land use planning are scored on four criteria: year of adoption, community planning requirement, principal plan review authority, authority for amendment of original plan and approval of amendments. Components are assigned a value 1-3, with higher values for greater state involvement. Components are then averaged, and those averages are used to assign a value of 1 for MSAs in states with weak state mandates, 2 in states with strong mandates, and 0 in states with no mandates (Yin and Sun 2007).
There is a significant quadratic effect of % African American, so that as the % African American increases, TE initially increases and then decline beyond the threshold of 8.44% African American.. NOTE FOR ME: The significance is from the f-test for joint significance, not the separate significance for those variables. These results are from model 2, the full-U.S. model with census region controls.
Figure: Fitted plot of the relationship between % African American and the TE index, based on model 2 (with regional controls). As % African American increases, TE increases and then declines beyond the inflection point of 8.44% African American . This could be because a larger African American population initially leads to more tolerance , but beyond 8.44%, greater diversity leads to racial conflict in politics or residential location choices . Research and theory indicates that racial threat can affect the political process (Giles and Hertz 1994; Tolbert and Hero 2001), so it could also affect the politics of transportation. However, it is important to note that this interpretation is tentative , and there are complications that could affect this relationship.
Although census region wasn’t the only significant control, I’m going to discuss it here because it had a huge influence on the operation of other variables. First, western MSAs showed significantly higher TE. Additionally, controlling for census region altered the significance of other variables. In other words, the social forces that affect TE vary from region to region . This is probably because there is an unmeasured variable which varies by region, that influences the other relationships found in this analysis. I expect that this variable is either culture or climate, and this would be very interesting to investigate in future analyses. Photo Credits: http://www.hatcountry.com/images/DesperadoStraw-1.jpg http://3.bp.blogspot.com/-Cr3GNRnH0Sg/TwyCWE8zrwI/AAAAAAAAChE/oUZ1r6NYSy8/s1600/rainy+bus+stop.jpg
The most interesting results: the interactions! There is a significant and positive interaction between real income per capita and % change in real income per capita. In other words, metro areas with high and rising incomes tend to have even more ecoefficient transportation systems , and this provides strong support for the theory. There is a significant and positive interaction between state-mandated urban growth management and real income per capita, which probably means that community wealth helps with the implementation of growth management policies . (p=0.015 for this interaction effect) NOTE FOR ME: These results are from Series 2 interaction models, the pared down full-U.S. model with regional controls.
The predictive power of these models is very high , and including the interactions slightly improves the predictive power compared to the base model.
A qualitative difference (in service quality, perceptions of riders and planners) between buses and rail or BRT . Perceptions render bus transit a second-class mode. Interpretation of race (i.e. that racial tolerance initially increases TE, but as % African American increases further, racial conflict or threat leads to TE declines): quadratic effect was unexpected, and social theory has not provided an explanation . Is this really a class effect (even though % of families in poverty was controlled for)? Exclusive focus on African Americans (other minority racial groups make up a growing % of the US population). Hispanic populations were not assessed consistently in census data from 1980, but still useful to evaluate many racial groups today. More nuanced/specific forms of segregation, a connection between race and the perceptions of rail versus bus, perceived associations between race and crime as a barrier to bus ridership, etc. Inadequate metrics , due to data limitations: not good to rely on state-level laws mandating urban growth management; Non-significant variables: city management capacity, local government fragmentation.
Values ranges for categories based on 2000 Transportation Ecoefficiency (TE) Scores, for U.S. Metropolitan Statistical Areas (MSAs). Well below average: TE = -0.5 and below, 7 MSAs (2.6%) A little below average: TE = -0.49 to -0.1, 100 MSAs (36.8%) Average: TE = + or - 0.09, 71 MSAs (26.1%) A little above average: TE = 0.1 to 0.49, 68 MSAs (25.0%) Well above average: TE = 0.5 to 1, 18 MSAs (6.6%) Very high above average: TE = >1, 8 MSAs (2.9%)