community connectivity analysis to support active living brent turley, pe bmpo joint policy...
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Community Connectivity Analysisto Support Active Living
Brent Turley, PEBMPO Joint Policy Board/TAC Meeting
November 9, 2011
The Nexus?
• Connectivity: The quality of a network to facilitate travel between two points.
• Good connectivity means removed barriers to travel• Good pedestrian and bicycle connectivity means greater
opportunity for active living trips• Connectivity can be a performance or priority metric• Connectivity can be one of several metrics to evaluate
active living policies over time
Point-to-point GIS routing?
The direct measure of connectivity
B
A/B B
Route Directness
Index
71
Distance Decay Score
91
ViaCity Score81
A
Existing With Connectivity ProjectsExample
Other connectivity metrics?
Metric Constraint
HCM 2010 Multimodal LOS (NCHRP 616)
Facility based; Not sensitive to network systems, barriers, or key connections
Travel demand models Not scalable to pedestrian or bicycle level of detail
Walkscore (or similar web tools) Informational only; Not applicable for project planning
Intersection density Indirect metric; Not sensitive to projects
GIS buffering Ignores network completely
LOCAL EXAMPLESBMPO Analysis
Study Locations
• Downtown• Schools (2)• Parks (2)
Are these destinations well connected to surrounding areas?
Analysis Process• Select parcels/building within 0.5 mile buffer around site• Enhance street network to create pedestrian network• Assign pedestrian quality to each network link• Calculate connectivity metric (ViaCity score)• Review results, run/compare scenarios
Downtown
• Good sidewalk coverage
• Barriers: • River• Railroad• Yellowstone Hwy• S Boulevard
Downtown
• Scores:• Average = 65• Over 60 = 73%
• Problem areas:• Northeast• South• Southwest
Tautphaus Park
• Few sidewalks near park
• Barriers: • Rollandet Ave• S Boulevard• Park access points• On-site network
Tautphaus Park
• Scores:• Average = 53• Over 60 = 29%
• Problem areas:• Points west• Southeast• Adjacent streets
Sand Creek Middle School
• Set back from arterials
• Barriers: • Canal• Paved connections
to west• Arterials
Sand Creek Middle School
• Scores:• Average = 54• Over 60 = 32%
• Problem areas:• North (canal)• West (multi-family)
Iona City Park
• Recent pathways• Barriers:
• Some arterials sections
• No defined routes
Iona City Park
• Scores:• Average = 63• Over 60 = 56%
• Problem areas:• Defined routes
Eagle Rock Jr High School
• No sidewalk along collectors or arterials
• Barriers: • Broadway St• Skyline Dr• Pancheri Dr
Eagle Rock Jr High School
• Scores:• Average = 54• Over 60 = 49%
• Problem areas:• Crossing Broadway• Crossing Skyline
Eagle Rock Jr High School
Link Ranking• Another metric• Aggregation of
shortest paths from each parcel
• Potential high priority links
Summary Statistics
Average ViaCity Score
Percent Parcels > 60
Number Total Parcels
Downtown 65 73% 1,776
Eagle Rock Jr High 54 49% 1,514
Tautphaus Park 53 29% 2,024
Sand Creek Middle 54 32% 1,225
Iona City Park 63 56% 587
BEFORE & AFTERExamples
Eagle Rock Before
• Scores:• Average = 54• Over 60 = 49%
Eagle Rock After
• Scores:• Average = 57• Over 60 = 49%
• Project:• Crossing Skyline
Eagle Rock Change
• Parcels impacted:• Change > 5 = 163• Change > 20 = 132
Sand Creek Before
• Scores:• Average = 54• Over 60 = 32%
Sand Creek After
• Scores:• Average = 56• Over 60 = 35%
• Project:• Yard crossing
Sand Creek Change
• Parcels impacted:• Change > 5 = 113• Change > 20 = 66