marshall - cnu street network presentation
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Street Networks, Road Safety & Sustainability
Wesley Marshall, P.E.Norman W. Garrick, PhD
Center for Transportation & Urban Planning
University of Connecticut
Sustainable Transportation Networks Congress for the New Urbanism XVIIJune 13, 2009Denver, Colorado
Road Safety…
in the United States
Fatalities per million VMT
20
1925
15
10
01935 1945 1955 1965 1975 1985 1995 2005
5
Fatalities: 8VMT: 2 million miles
Fatalities per million VMT = 4
Fatalities: 8VMT: 1 million miles
Fatalities per million VMT = 8
Population: 50,000Fatalities per 100k pop. = 16
Population: 100,000
Population per 100k pop. = 8
Fatalities per million VMT
20
3,000
1925
VMT
(billions
)
15
10
0
2,000
1,000
0
Population
1935 1945 1955 1965 1975 1985 1995 2005
24 x
2.5 x5
0
Average VMT (per capita per day)
60,000
40,000
20,000
0
Total No. of Fatalities
Population
VMT
(billions
)
Fatalities per million VMT
20
1925
15
10
01935 1945 1955 1965 1975 1985 1995 2005
5
30
25
Fatalities per 100,000 population
Road Safety in the U.S.
Road Fatalities per 100,000 Population by CountryUnited States
(Source: Organisation for Economic Co-operation and Development, OECD)
(Source: Organisation for Economic Co-operation and Development, OECD)
International Road Safety
Why is the U.S. falling behind the rest of the world when it
comes to safety in the transportation system?
When it comes to trying to make our roads safer…
The focus tends to be on finding the most
problematic locations and fixing them
http://imgs.sfgate.com/c/pictures/2007/01/03/ba_octavia28_009_rad.jpg
www.streetsblog.org
Road Safety
24 medium-sized California cities
Cities selected to represent a range of traffic safety levels
Geographically diverse with locally
generated traffic
California City Study
CALIFORNIA CITY COMPARISON
SaferCities
Less SafeCities
Population(average) 65,71959,845
Fatalities per100,000 pop.
(per year)
3.39.8
Road Fatalities(total over 11 years)
257771
Non-HW Fatalities per 100,000 pop.
(per year)
2.58.6
Non-HighwayRoad Fatalities
(total over 11 years)
200676
Relative Risk = 3.4
per city per year 1.95.8
Relative Risk = 3.0
per city per year 1.55.1
Why are these places so different in terms of
safety outcomes?
CALIFORNIA CITY COMPARISON
Mode Share
Driving 84.1%95.8%
PopulationDensity 5,736 per sq. mi.2,673 per sq. mi.
Avg. Year ofIncorporation 18951932
Walking 5.4%1.7%
Biking 4.1%0.7%
Transit 6.6%1.7%
SaferCities
Less SafeCities
Davis
1940195019601970198019902000
Measuring Street Networks
How Do We Characterize Street Networks?
Connected
GriddedDense
Hierarchical
PatternsBlock Size
Link to Node Ratio
Road Density Intersection Density
There are 3 fundamental items of interest in characterizing a street network…
Street ConnectivityStreet Network DensityStreet Patterns
Characterizing Street Networks
i.ii.iii.
HIGH CONNECTIVITY ≠ A DENSE NETWORK
Intersection Density
144 144 144
Link to Node Ratio
1.61 1.13 1.16
HIGH CONNECTIVITY ≠ A DENSE NETWORK
Simplifying Street Patterns
Citywide Macroscopic NetworkN
eig
hb
orh
ood M
icro
Netw
ork
LinearTree
GridTributary Radial
Gri
dTre
e
Adapted from Stephen Marshall, Streets & Patterns
Carlsbad, California
LinearTree
GridTributary Radial
Gri
dTre
e
NETWORK COMPARISON
Avg. Year of Development 1965 1974 19661966
Avg. Year of Development 1950 Pre 1940 Pre 1940
Crash Data
Results
SaferCities
Less SafeCities
Intersection Density 106 per sq. mi. 63 per sq. mi.
Dead EndDensity
32 per sq. mi. 23 per sq mi.
% Dead Ends 23.2% 26.7%
Macro Node Density 7.5 per sq. mi. 4.9 per sq. mi.
% Major Nodes 7.1% 7.8%
Link to Node Ratio 1.34 1.29
Connected Node Ratio 0.76 0.73
STREET NETWORK COMPARISON
Connectivity Measures
-40.6%
-28.1%
-34.7%
-3.7%
-4.0%
Difference
SaferCities
Less SafeCities
Fatal Crashesper 100,000 pop. 3.3 per year 9.8 per year
Severe Crashesper 100,000 pop. 16.4 per year 18.4 per year
Severity Risk(% Fatal or Severe)
1.9% 3.2%
Macro Road Fatal or Severe per 100k pop. 16.4 per year 17.4 per year
Severity Risk(% Fatal or Severe) 1.9% 3.2%
Micro Road Fatal orSevere per 100k pop. 2.7 per year 4.6 per year
Severity Risk(% Fatal or Severe) 1.5% 3.1%
ROAD SAFETY COMPARISON
197.0%
12.2%
6.1%
70.4%
58.8%
Difference
68.4%
68.4%
SAFER CITIES – NETWORK DENSITY
NetworkDensity
Comparison
< 81
Risk of Injury
(non-highway)
41.0%
81-144
38.5%
144-225
39.1%
225+
37.7%
IntersectionDensity
9x9 12x12 15x15
Block Length 660’ 480’ 375’
1 Sq. MileGrid Size
81 144 225
Risk of Severe Inj.
(non-highway)
3.3% 1.9% 1.8% 1.5%
Risk of Fatality(non-highway)
0.5% 0.3% 0.2% 0.2%
Statistical Analysis
What do we want to know?
How are street network measures associated
(correlated) with road safety outcomes?
Statistical Analysis
Response Variables:
Model 1: Total No. of Crashes
Model 2: Total No. of Severe Injury Crashes
Model 3: Total No. of Fatal Crashes
Statistical Analysis
Built crash prediction models using a generalized linear regression
Crash Model ResultsVariables
= Significant with Positive Association (More Crashes)
= Significant with Negative Association (Fewer Crashes)
= Not Significant
Model 1 Model 2 Model 3
Variables
Street Network MeasuresStreet Pattern Type (categorical)
Intersection Density
Macro-Intermediate Intersection Density
Dead End Node Density
Link to Node Ratio
Curvilinear (0, 1)
Street Level DataAvg. # of Lanes
Avg. Width of Outside Shoulder
Raised Median (0, 1)
Painted Median (0, 1)
% of Macro Road Length with On-Street Parking
% of Macro Road Length with Bike Lanes
% of Macro Road Length with Curbs
ExposureVMT
Proxy for Activity
MiscellaneousDistance from City Center
Avg. Income
Adjacent Limited Access Highway
Mixed Land Uses
Severe Injury Crashes
Fatal Crashes
Model 1 Model 2 Model 3
Variables
Street Network MeasuresStreet Pattern Type (categorical)
Intersection Density
Macro-Intermediate Intersection Density
Dead End Node Density
Link to Node Ratio
Curvilinear (0, 1)
Street Level DataAvg. # of Lanes
Avg. Width of Outside Shoulder
Raised Median (0, 1)
Painted Median (0, 1)
% of Macro Road Length with On-Street Parking
% of Macro Road Length with Bike Lanes
% of Macro Road Length with Curbs
ExposureVMT
Proxy for Activity
MiscellaneousDistance from City Center
Avg. Income
Adjacent Limited Access Highway
Mixed Land Uses
Total CrashesSevere Injury
Crashes
Model 1 Model 2 Model 3
Variables
Street Network MeasuresStreet Pattern Type (categorical)
Intersection Density
Macro-Intermediate Intersection Density
Dead End Node Density
Link to Node Ratio
Curvilinear (0, 1)
Street Level DataAvg. # of Lanes
Avg. Width of Outside Shoulder
Raised Median (0, 1)
Painted Median (0, 1)
% of Macro Road Length with On-Street Parking
% of Macro Road Length with Bike Lanes
% of Macro Road Length with Curbs
ExposureVMT
Proxy for Activity
MiscellaneousDistance from City Center
Avg. Income
Adjacent Limited Access Highway
Mixed Land Uses
Total Crashes
Model 1 Model 2 Model 3
Variables
Street Network MeasuresStreet Pattern Type (categorical)
Intersection Density
Macro-Intermediate Intersection Density
Dead End Node Density
Link to Node Ratio
Curvilinear (0, 1)
Street Level DataAvg. # of Lanes
Avg. Width of Outside Shoulder
Raised Median (0, 1)
Painted Median (0, 1)
% of Macro Road Length with On-Street Parking
% of Macro Road Length with Bike Lanes
% of Macro Road Length with Curbs
ExposureVMT
Proxy for Activity
MiscellaneousDistance from City Center
Avg. Income
Adjacent Limited Access Highway
Mixed Land Uses
Total Crashes (Model 1)
% Change % Change % Change
Intersection Density81 14.15% 20.05% 53.75%144 (reference value) - - -225 -15.64% -20.94% -42.48%324 -31.48% -40.67% -70.74%
Link to Node Ratio1.1 -14.29% -12.20% -28.21%1.25 (reference value) - - -1.4 16.67% 13.90% 39.29%1.55 36.13% 29.73% 94.02%
Total No. of Lanes on Macro Roads2 (reference value) - - -4 65.17% 33.96% 34.15%6 172.81% 79.46% 79.95%
Distance from City Center (miles)0 41.48% 23.71% -12.86%1 18.95% 11.23% -6.65%2 (reference value) - - -3 -15.93% -10.09% 7.12%4 -29.32% -19.17% 14.75%
% of Macro Road Length with On-Street Parking0% (reference value) - - -50% 18.26% 19.49% -100% 39.86% 42.79% -
% of Macro Road Length with Bike Lanes0% (reference value) - - -50% - - -14.29%100% - - -26.53%
Total Crashes (Model 1)
Severe Crashes (Model 2)
Total Fatal Crashes (Model 3)
% Change % Change % Change
Intersection Density81 14.15% 20.05% 53.75%144 (reference value) - - -225 -15.64% -20.94% -42.48%324 -31.48% -40.67% -70.74%
Link to Node Ratio1.1 -14.29% -12.20% -28.21%1.25 (reference value) - - -1.4 16.67% 13.90% 39.29%1.55 36.13% 29.73% 94.02%
Total No. of Lanes on Macro Roads2 (reference value) - - -4 65.17% 33.96% 34.15%6 172.81% 79.46% 79.95%
Distance from City Center (miles)0 41.48% 23.71% -12.86%1 18.95% 11.23% -6.65%2 (reference value) - - -3 -15.93% -10.09% 7.12%4 -29.32% -19.17% 14.75%
% of Macro Road Length with On-Street Parking0% (reference value) - - -50% 18.26% 19.49% -100% 39.86% 42.79% -
% of Macro Road Length with Bike Lanes0% (reference value) - - -50% - - -14.29%100% - - -26.53%
% Change % Change % Change
Intersection Density81 14.15% 20.05% 53.75%144 (reference value) - - -225 -15.64% -20.94% -42.48%324 -31.48% -40.67% -70.74%
Link to Node Ratio1.1 -14.29% -12.20% -28.21%1.25 (reference value) - - -1.4 16.67% 13.90% 39.29%1.55 36.13% 29.73% 94.02%
Total No. of Lanes on Macro Roads2 (reference value) - - -4 65.17% 33.96% 34.15%6 172.81% 79.46% 79.95%
Distance from City Center (miles)0 41.48% 23.71% -12.86%1 18.95% 11.23% -6.65%2 (reference value) - - -3 -15.93% -10.09% 7.12%4 -29.32% -19.17% 14.75%
% of Macro Road Length with On-Street Parking0% (reference value) - - -50% 18.26% 19.49% -100% 39.86% 42.79% -
% of Macro Road Length with Bike Lanes0% (reference value) - - -50% - - -14.29%100% - - -26.53%
Total Crashes (Model 1)
Severe Crashes (Model 2)
% Change % Change % Change
Intersection Density81 14.15% 20.05% 53.75%144 (reference value) - - -225 -15.64% -20.94% -42.48%324 -31.48% -40.67% -70.74%
Link to Node Ratio1.1 -14.29% -12.20% -28.21%1.25 (reference value) - - -1.4 16.67% 13.90% 39.29%1.55 36.13% 29.73% 94.02%
Total No. of Lanes on Macro Roads2 (reference value) - - -4 65.17% 33.96% 34.15%6 172.81% 79.46% 79.95%
Distance from City Center (miles)0 41.48% 23.71% -12.86%1 18.95% 11.23% -6.65%2 (reference value) - - -3 -15.93% -10.09% 7.12%4 -29.32% -19.17% 14.75%
% of Macro Road Length with On-Street Parking0% (reference value) - - -50% 18.26% 19.49% -100% 39.86% 42.79% -
% of Macro Road Length with Bike Lanes0% (reference value) - - -50% - - -14.29%100% - - -26.53%
Severe Crashes (Model 2)
Total Fatal Crashes (Model 3)
% Change % Change % Change
Intersection Density81 14.15% 20.05% 53.75%144 (reference value) - - -225 -15.64% -20.94% -42.48%324 -31.48% -40.67% -70.74%
Link to Node Ratio1.1 -14.29% -12.20% -28.21%1.25 (reference value) - - -1.4 16.67% 13.90% 39.29%1.55 36.13% 29.73% 94.02%
Total No. of Lanes on Macro Roads2 (reference value) - - -4 65.17% 33.96% 34.15%6 172.81% 79.46% 79.95%
Distance from City Center (miles)0 41.48% 23.71% -12.86%1 18.95% 11.23% -6.65%2 (reference value) - - -3 -15.93% -10.09% 7.12%4 -29.32% -19.17% 14.75%
% of Macro Road Length with On-Street Parking0% (reference value) - - -50% 18.26% 19.49% -100% 39.86% 42.79% -
% of Macro Road Length with Bike Lanes0% (reference value) - - -50% - - -14.29%100% - - -26.53%
FULL NETWORK CRASH MODELS
Total Crashes (Model 4)
Severe Crashes (Model 5)
Total Fatal Crashes (Model 6)
% Change % Change % Change
Intersection Density81 7.85% 13.43% 39.52%144 (reference value) - - -225 -9.26% -14.96% -34.83%324 -19.43% -30.23% -61.38%
Link to Node Ratio1.1 - - -24.30%1.25 (reference value) - - -1.4 - - 32.10%1.55 - - 74.50%
Total No. of Lanes on Macro Roads2 -45.82% -30.54% -23.08%4 (reference value) - - -6 84.56% 43.96% 30.01%
Distance from City Center (miles)0 51.26% 35.28% -12.88%1 22.99% 16.31% -6.66%2 (reference value) - - -3 -18.69% -14.02% 7.14%4 -33.89% -26.08% 14.78%
% of Macro Road Length with On-Street Parking0% -18.12% -15.10% 19.93%50% (reference value) - - -100% 22.13% 17.78% -16.62%
% of Macro Road Length with Bike Lanes0% - - 20.42%50% (reference value) - - -
CITYWIDE MACRO CRASH MODELS
LT GT
Intersection Density
Link to Node Ratio
90
1.09
140
1.15
130
1.18
160
1.24
Expected Total Crashes
Expected Fatal Crashes
290
1.2
202
0.9
275
1.1
213
1.0
Intersection Density
Link to Node Ratio
-
-
225
1.34
289
1.37
265
1.40
Expected Total Crashes
Expected Severe Injury Crashes
-
-
191
3.1
211
3.3
209
3.1
(Non-HW Crashes)
RTTT
LG GGRGTG
Expected Severe Injury Crashes 5.5 3.8 4.1 5.2
Expected Fatal Crashes - 0.8 0.6 0.7
LT GT
% Walking
% Biking
2.9%
1.6%
3.5%
2.5%
1.9%
0.9%
2.9%
1.7%
% Public Transit
% Driving
3.3%
92.2%
4.3%
89.7%
2.1%
95.1%
2.9%
92.5%
% Walking
% Biking
N/A
N/A
4.8%
3.3%
4.0%
4.2%
9.5%
4.6%
% Public Transit
% Driving
N/A
N/A
4.3%
87.6%
10.2%
81.6%
10.9%
75.0%
RTTT
LG GGRGTG
MODE CHOICE
MODE CHOICE MODEL
Variables
BASELINE BY STREET PATTERN TYPE 3.66% 2.28% 1.71% 92.35% 4.18% 3.93% 3.39% 88.51% 9.00% 8.79% 4.09% 78.13%Intersection Density
81 3.81% 1.94% 1.29% 92.96% 5.94% 4.69% 2.72% 86.64% 8.93% 5.08% 2.84% 83.15%144 3.65% 2.30% 1.74% 92.31% 5.10% 4.35% 3.00% 87.55% 8.98% 6.14% 3.23% 81.65%225 3.44% 2.85% 2.56% 91.15% 4.19% 3.93% 3.38% 88.50% 9.01% 7.81% 3.79% 79.39%324 3.18% 3.69% 4.06% 89.07% 3.27% 3.47% 3.91% 89.35% 8.96% 10.40% 4.56% 76.08%
Link to Node Ratio1.1 3.42% 2.40% 1.74% 92.44% 2.58% 2.87% 1.59% 92.95% 8.40% 9.93% 3.21% 78.47%1.25 4.17% 2.05% 1.65% 92.13% 3.49% 3.50% 2.55% 90.46% 8.69% 9.35% 3.62% 78.34%1.4 5.06% 1.75% 1.55% 91.63% 4.67% 4.22% 4.05% 87.06% 8.99% 8.80% 4.08% 78.13%1.55 6.14% 1.50% 1.46% 90.91% 6.16% 5.01% 6.32% 82.52% 9.29% 8.28% 4.59% 77.85%
Total No. of Lanes on Macro Roads2 4.48% 2.34% 1.72% 91.46% 7.15% 6.38% 3.80% 82.66% 8.28% 8.57% 3.45% 79.70%4 2.80% 2.19% 1.68% 93.32% 2.10% 2.10% 2.85% 92.95% 10.16% 9.09% 5.27% 75.48%6 1.74% 2.05% 1.63% 94.58% 0.57% 0.64% 1.97% 96.82% 12.26% 9.48% 7.93% 70.33%
Distance from City Center (miles)0 3.30% 4.03% 3.18% 89.49% 3.88% 5.47% 4.86% 85.79% 8.39% 11.10% 5.28% 75.23%1 3.48% 3.06% 2.36% 91.11% 4.12% 4.19% 3.63% 88.06% 9.04% 8.62% 4.00% 78.33%2 3.65% 2.31% 1.74% 92.30% 4.35% 3.18% 2.69% 89.77% 9.65% 6.62% 3.00% 80.72%3 3.82% 1.74% 1.27% 93.17% 4.57% 2.41% 1.99% 91.04% 10.22% 5.05% 2.23% 82.50%4 3.98% 1.31% 0.93% 93.78% 4.78% 1.81% 1.46% 91.95% 10.75% 3.82% 1.65% 83.78%
MODE CHOICE MODEL Transit Mode Share
Pedestrian Mode Share
Biking Mode Share
Automobile Mode Share
(all other variables held at mean)
(all other variables held at mean)
(all other variables held at mean)
(all other variables held at mean)
Variables
BASELINE BY STREET PATTERN TYPE 3.66% 2.28% 1.71% 92.35% 4.18% 3.93% 3.39% 88.51% 9.00% 8.79% 4.09% 78.13%Intersection Density
81 3.81% 1.94% 1.29% 92.96% 5.94% 4.69% 2.72% 86.64% 8.93% 5.08% 2.84% 83.15%144 3.65% 2.30% 1.74% 92.31% 5.10% 4.35% 3.00% 87.55% 8.98% 6.14% 3.23% 81.65%225 3.44% 2.85% 2.56% 91.15% 4.19% 3.93% 3.38% 88.50% 9.01% 7.81% 3.79% 79.39%324 3.18% 3.69% 4.06% 89.07% 3.27% 3.47% 3.91% 89.35% 8.96% 10.40% 4.56% 76.08%
Link to Node Ratio1.1 3.42% 2.40% 1.74% 92.44% 2.58% 2.87% 1.59% 92.95% 8.40% 9.93% 3.21% 78.47%1.25 4.17% 2.05% 1.65% 92.13% 3.49% 3.50% 2.55% 90.46% 8.69% 9.35% 3.62% 78.34%1.4 5.06% 1.75% 1.55% 91.63% 4.67% 4.22% 4.05% 87.06% 8.99% 8.80% 4.08% 78.13%1.55 6.14% 1.50% 1.46% 90.91% 6.16% 5.01% 6.32% 82.52% 9.29% 8.28% 4.59% 77.85%
Total No. of Lanes on Macro Roads2 4.48% 2.34% 1.72% 91.46% 7.15% 6.38% 3.80% 82.66% 8.28% 8.57% 3.45% 79.70%4 2.80% 2.19% 1.68% 93.32% 2.10% 2.10% 2.85% 92.95% 10.16% 9.09% 5.27% 75.48%6 1.74% 2.05% 1.63% 94.58% 0.57% 0.64% 1.97% 96.82% 12.26% 9.48% 7.93% 70.33%
Distance from City Center (miles)0 3.30% 4.03% 3.18% 89.49% 3.88% 5.47% 4.86% 85.79% 8.39% 11.10% 5.28% 75.23%1 3.48% 3.06% 2.36% 91.11% 4.12% 4.19% 3.63% 88.06% 9.04% 8.62% 4.00% 78.33%2 3.65% 2.31% 1.74% 92.30% 4.35% 3.18% 2.69% 89.77% 9.65% 6.62% 3.00% 80.72%3 3.82% 1.74% 1.27% 93.17% 4.57% 2.41% 1.99% 91.04% 10.22% 5.05% 2.23% 82.50%4 3.98% 1.31% 0.93% 93.78% 4.78% 1.81% 1.46% 91.95% 10.75% 3.82% 1.65% 83.78%
TT
MODE CHOICE MODEL Transit Mode Share
Pedestrian Mode Share
Biking Mode Share
Automobile Mode Share
(all other variables held at mean)
(all other variables held at mean)
(all other variables held at mean)
(all other variables held at mean)
Variables
BASELINE BY STREET PATTERN TYPE 3.66% 2.28% 1.71% 92.35% 4.18% 3.93% 3.39% 88.51% 9.00% 8.79% 4.09% 78.13%Intersection Density
81 3.81% 1.94% 1.29% 92.96% 5.94% 4.69% 2.72% 86.64% 8.93% 5.08% 2.84% 83.15%144 3.65% 2.30% 1.74% 92.31% 5.10% 4.35% 3.00% 87.55% 8.98% 6.14% 3.23% 81.65%225 3.44% 2.85% 2.56% 91.15% 4.19% 3.93% 3.38% 88.50% 9.01% 7.81% 3.79% 79.39%324 3.18% 3.69% 4.06% 89.07% 3.27% 3.47% 3.91% 89.35% 8.96% 10.40% 4.56% 76.08%
Link to Node Ratio1.1 3.42% 2.40% 1.74% 92.44% 2.58% 2.87% 1.59% 92.95% 8.40% 9.93% 3.21% 78.47%1.25 4.17% 2.05% 1.65% 92.13% 3.49% 3.50% 2.55% 90.46% 8.69% 9.35% 3.62% 78.34%1.4 5.06% 1.75% 1.55% 91.63% 4.67% 4.22% 4.05% 87.06% 8.99% 8.80% 4.08% 78.13%1.55 6.14% 1.50% 1.46% 90.91% 6.16% 5.01% 6.32% 82.52% 9.29% 8.28% 4.59% 77.85%
Total No. of Lanes on Macro Roads2 4.48% 2.34% 1.72% 91.46% 7.15% 6.38% 3.80% 82.66% 8.28% 8.57% 3.45% 79.70%4 2.80% 2.19% 1.68% 93.32% 2.10% 2.10% 2.85% 92.95% 10.16% 9.09% 5.27% 75.48%6 1.74% 2.05% 1.63% 94.58% 0.57% 0.64% 1.97% 96.82% 12.26% 9.48% 7.93% 70.33%
Distance from City Center (miles)0 3.30% 4.03% 3.18% 89.49% 3.88% 5.47% 4.86% 85.79% 8.39% 11.10% 5.28% 75.23%1 3.48% 3.06% 2.36% 91.11% 4.12% 4.19% 3.63% 88.06% 9.04% 8.62% 4.00% 78.33%2 3.65% 2.31% 1.74% 92.30% 4.35% 3.18% 2.69% 89.77% 9.65% 6.62% 3.00% 80.72%3 3.82% 1.74% 1.27% 93.17% 4.57% 2.41% 1.99% 91.04% 10.22% 5.05% 2.23% 82.50%4 3.98% 1.31% 0.93% 93.78% 4.78% 1.81% 1.46% 91.95% 10.75% 3.82% 1.65% 83.78%
MODE CHOICE MODEL Transit Mode Share
(all other variables held at mean)
Variables
BASELINE BY STREET PATTERN TYPE 3.66% 2.28% 1.71% 92.35% 4.18% 3.93% 3.39% 88.51% 9.00% 8.79% 4.09% 78.13%Intersection Density
81 3.81% 1.94% 1.29% 92.96% 5.94% 4.69% 2.72% 86.64% 8.93% 5.08% 2.84% 83.15%144 3.65% 2.30% 1.74% 92.31% 5.10% 4.35% 3.00% 87.55% 8.98% 6.14% 3.23% 81.65%225 3.44% 2.85% 2.56% 91.15% 4.19% 3.93% 3.38% 88.50% 9.01% 7.81% 3.79% 79.39%324 3.18% 3.69% 4.06% 89.07% 3.27% 3.47% 3.91% 89.35% 8.96% 10.40% 4.56% 76.08%
Link to Node Ratio1.1 3.42% 2.40% 1.74% 92.44% 2.58% 2.87% 1.59% 92.95% 8.40% 9.93% 3.21% 78.47%1.25 4.17% 2.05% 1.65% 92.13% 3.49% 3.50% 2.55% 90.46% 8.69% 9.35% 3.62% 78.34%1.4 5.06% 1.75% 1.55% 91.63% 4.67% 4.22% 4.05% 87.06% 8.99% 8.80% 4.08% 78.13%1.55 6.14% 1.50% 1.46% 90.91% 6.16% 5.01% 6.32% 82.52% 9.29% 8.28% 4.59% 77.85%
Total No. of Lanes on Macro Roads2 4.48% 2.34% 1.72% 91.46% 7.15% 6.38% 3.80% 82.66% 8.28% 8.57% 3.45% 79.70%4 2.80% 2.19% 1.68% 93.32% 2.10% 2.10% 2.85% 92.95% 10.16% 9.09% 5.27% 75.48%6 1.74% 2.05% 1.63% 94.58% 0.57% 0.64% 1.97% 96.82% 12.26% 9.48% 7.93% 70.33%
Distance from City Center (miles)0 3.30% 4.03% 3.18% 89.49% 3.88% 5.47% 4.86% 85.79% 8.39% 11.10% 5.28% 75.23%1 3.48% 3.06% 2.36% 91.11% 4.12% 4.19% 3.63% 88.06% 9.04% 8.62% 4.00% 78.33%2 3.65% 2.31% 1.74% 92.30% 4.35% 3.18% 2.69% 89.77% 9.65% 6.62% 3.00% 80.72%3 3.82% 1.74% 1.27% 93.17% 4.57% 2.41% 1.99% 91.04% 10.22% 5.05% 2.23% 82.50%4 3.98% 1.31% 0.93% 93.78% 4.78% 1.81% 1.46% 91.95% 10.75% 3.82% 1.65% 83.78%
GG
LT GTRTTT
LG GGRGTG
VMT in Block Group per capita per day 66 28 27 51
VMT in Block Group per capita per day - 21 23 24
VMT
24 x
1925VM
T (b
illions
)
Population
1935 1945 1955 1965 1975 1985 1995 2005
2.5 x
Effect on VMT?
8 x
Street DesignCommunity DesignStreet ConnectivityMore Sustainable Places
Safer &
Alternative Modes
Road Safety & Mode Choice
Getting things right requires a more comprehensive approach that considers:
Redefining the Problem
Street Network Density
Street Patterns
All of which will help inform our efforts toward creating: