Climate Change and Health Impacts of Transportation Network Design

Climate Change and Health Impacts of Transportation Network Design Dr. Lawrence Frank Bombardier Chair in Sustainable Transportation University of British Columbia

Transportation and Land use Decisions, Land Use Patterns, Travel Choices and Outcomes

The built environment affects our health

Philosophical Approach
Bridging knowledge and action
Applied Policy Research
Working across disciplines
Connecting Health, Environmental, and Transportation Sectors
Building evidence base on the impacts of community design on health and environmental outcomes
Quantifying the externalities
Finding strategic opportunities to intervene
Evaluating natural experiments

. Proximity Connect- ivity 2 KM 1 KM

Vancouver Walkability Surface

Adult Findings - Transit Use Devlin and Frank, 2009

Adult Findings - Walking Devlin and Frank, 2009

Adult Findings - Vehicle Use Devlin and Frank, 2009

Transit Supportive / Walkability Map
Mixed Use
Density
Street Connectivity
Amount of Retail
Census Block Groups Lawrence Frank, UBC

LFC, Inc. May 19, 2009 * Controlled for gender, income, age, total number of vehicles in the house * VOC differences across quartiles significant (p<0.001 Volatile Organic Compounds & Intersection Density (n=2467) Air Pollution & Neighborhood Design Source: Frank, L.D. Sallis, J.F., Conway, T., Chapman, J., Saelens, B. Bachman, W. (2006). Multiple Pathways from Land Use to Health: Walkability Associations With Active Transportation, Body Mass Index, and Air Quality. Journal of the American Planning Association .

CO2 & Neighbourhood Design LFC, Inc. May. 19, 2009 Source: LUTAQH final report, King County ORTP, 2005

Puget Sound Mode Choice Study 2007
for non-work (home-based other) tours…
Increasing home and destination intersection densities by 10% were associated with a 2.4% and 2.3% respective increase in transit demand.
Increasing street network connectivity at the home location by 10% was associated with a 2.8% increase in walking, and increasing street network connectivity by 10% at the destination was associated with an additional 2.7% increase in walking.
Study Published in Transportation

Seattle / King County LUTAQH study
Travel survey household average = 68 intersections / sq km
Out of all urban form variables, the greatest differences in VMT were observed across levels of intersection density.
Residents in the most interconnected areas of the county travel 26 percent fewer vehicle miles per day than those in the most disconnected areas.
Each quartile of increase in intersection density corresponded with a 14 percent increase in the odds of walking for non-work travel.

Youth Travel to School Study (EPA)
Increasing intersection density along the route to school from the median value to the 60 th percentile …
Increases the probability of walking to school by 6.67%, for ages 5-10
Decreases the average trip distance by 3.23%
Decreases carbon dioxide by 2.34%
Decreases hydrocarbons by 2.25%
Decreases oxides of nitrogen by 2.65%
per student, per trip .

*p<.05, **p<.01, ***p<.001 *p<.05, **p<.01, ***p<.001 controlling for socio-demographics and stratified by age group (Averaged over a two day period) LOGISTIC REGRESSION ANALYSES PREDICTING THE ODDS OF WALKING AT LEAST ONCE OVER 2-DAYS YOUTH Age Range 5-8 years OR (95% CI) 9-11 years OR (95% CI) 12-15 years OR (95% CI) 16-20 years OR (95% CI) N=847 N=632 N=867 N=815 Intersection highest tertile (vs lowest) 1.7 (1.0-2.9) 1.3 (0.8-2.3) 1.7 (1.1-2.8)* 2.0 (1.1-3.6)* Density highest tertile (vs lowest) 1.8 (1.0-3.1) 2.3 (1.2-4.3)** 3.7 (2.2-6.4)*** 2.0 (1.0-4.1) Mixed land use (vs no mix) 1.5 (0.9-2.4) 1.5 (0.9-2.5) 2.5 (1.6-3.8)*** 1.9 (1.0-3.2)* At least 1 commercial land use (vs 0) 1.5 (0.9-2.4) 1.6 (1.0-2.5) 2.6 (1.7-4.0)*** 1.7 (1.0-3.1) At least 1 recreation/open space land use (vs 0) 2.1 (1.3-3.4)*** 1.8 (1.1-2.9)* 2.5 (1.7-3.6)*** 1.8 (1.1-2.9)**

Analyzing the Fused Grid Fused Grid Residential Quadrant Resulting Pedestrian Network Resulting Vehicular Network

Non-Motorized V Motorized Connectivity
Disparities in network connectivity encourage more travel in the favored mode, other factors being equal.
Tested route directness for Drivers Vs Pedestrians
From home to nearest commercial destination
From home to nearest recreational destination
Assessed relative degree of route directness between driving and walking
Relationship with mode choice
Established four types of communities
Nexus of high and low levels of pedestrian and vehicle connectivity

Typology of Connectivity Patterns

Variable Development
Connectivity and continuity were measured on distinct modal networks – walking and driving

Residential Street Patterns in Study Area Seattle (Queen Anne) Bellevue (East) Redmond (South) King County, WA – Gridirons to Loop & Culs-de-sac

Findings - Descriptive Walking Mode Share and Street Connectivity Disparate Street Connectivity and associated Walk Shares (by person to commercial) Pedestrian Connectivity Low High Vehicular connectivity Low SE and Central Bellevue; SW Seattle – Loop and Culs-de-Sac Mean Mode Share: 10% walking n = 985 Queen Anne, Capital Hill (Seattle) – Modified grid with connectors Mean Mode Share: 18% walking n = 66 High N and , – Grid and major streets w/o sidewalks Mean Mode Share: 10% walking n = 59 Downtown and Older Neighbourhoods – Gridiron Mean Mode Share: 14% walking n = 966

Interpretation
A modification of only 10% on the relative connectivity of neighborhood streets (gridiron to Fused Grid) is associated with a 25.9% better odds of meeting, through walking, public health recommendations for daily physical activity.
Increasing relative network density by the same 10% => +18.2% odds of active levels of walking.

Modeling Physical Activity Outcomes For Contrasting Land Use Scenarios

I-PLACES Impact Assessment Model: the Concept
Use research results on the relationships between
Integrate these findings into an existing model structure
Urban Form Patterns Residential Density Land Use Mix Street Network Connectivity Retail Floor Area Ratio Outcomes Transit Use Vehicle Travel Walking Physical activity Obesity / Body Mass Index CO2 & pollutants from and

The White Center / SW 98 th St. Case Study White Center Neighborhood SW 98 th St. Corridor

Adding new modules to the I - PLACE3S model for King County
Climate change and air quality (outcomes: CO2, NOX, HC, and CO; vehicle trips and VMT)
Public health (outcomes: physical activity, BMI, walk and bike trips)
Tools for Scenario Planning

White Center Business District (16 th Ave S.)
High concentration of new immigrants and businesses oriented towards them
Low-income, good transit service & ridership

Buildout Scenario Full buildout of Greenbridge public housing Pedestrian connection links Greenbridge & 98th St. Corridor Full buildout at maximum density High density mixed use development (pink) Mid-rise residential development (dark orange) Approx. 2500 households, 1800 employees x

Existing pedestrian connection to 98 th St.
Steep, overgrown, muddy
Little-used
Not ADA accessible

Greenbridge Hope VI Redevelop-ment in White Center
Eastern half of 98 th St. case study area

Scenario Results CO2 (kg) / DU NOX (grams) / DU HC (grams) / DU CO (grams) / DU Car Vehicle Miles / DU Transit Person Miles / DU Walk / Bike Miles / DU BMI / Adult Minutes of Physical Activity / Adult BASE CASE 14.17 47.62 51.69 580.00 48.82 12.67 3.13 24.74 37.06 Buildout with ped connection 13.94 46.70 50.61 569.82 47.85 12.99 2.73 24.10 41.94 Base Case + Transit 13.13 44.62 48.62 542.38 45.64 13.34 3.13 24.60 37.06 Buildout + Ped Connection + Transit 12.90 43.70 47.54 532.20 44.67 13.65 2.73 23.96 41.94

Seattle - King County Development Review
Application of analysis on GHGs from transportation
Help achieve goals for GHG reduction (80 percent below 2007 levels by 2050)
Can condition or deny proposals that have significant, adverse impacts on the environment due to their GHG emissions.
If passed by the Council, King County will be the first local government in the nation to add GHG emissions to environmental review of construction projects.

LFC, Inc. May. 19, 2009 Final Map of CO2 emissions from transportation Includes: Local urban form (land use mix, intersection density, retail FAR) Regional location (auto travel time Transit accessibility & travel time Demographics

The Essential Role of Demand LFC, Inc. May. 9, 2009

Results – Urban Form + Major Progress
All else equal, households living in the most walkable King County neighborhoods were 54 percent more likely to meet the 8.4 daily mile threshold.
Each ten-minute decrease in regional transit travel time increased the odds of meeting the VMT target by 11 percent.

High Walkability Low Walkability Prefers a Walkable Community Design Prefers Auto - Based Community Design 1 2 4 3 Neighborhood Preferences Built Environment Maximum Minimum

Stated Preference (Q8a, Q8b, Q8c) Street Design and Travel Options

There is a latent demand for more connected streets – Even in Atlanta.

PREFERENCE VS NEIGHBORHOOD DESIGN

Built Environment Transportation Investments and Land Use Human Behavior Travel Patterns and Physical Activity Environmental Quality Air Quality and Greenspace Quality of Life

Working Across Sectors

The End

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Climate Change and Health Impacts of Transportation Network Design

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