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Measuring Connectivity with Route Directness Index & Evaluating Quality of Service September2010 Powered by:
What is Route Directness Index? A B straight-line distance “A” actual route distance “B” RDI = A  /  B
RDI Applied - Neighborhood Example RDI = 0.20 RDI = 0.83 shared-use path shared-use path
	Why Route Directness Index? RDI Other connectivity indices do not provide for parcel-level precision or land use consideration Focus only on transportation network instead of land use and its relationship to the system Research shows stronger correlation; previously considered hard to measure. Limited ability for other metrics to evaluate subtle changes in the connectivity of a system or to compare benefits of project alternatives. More intuitive for broader public, agency staff and elected official understanding.  Intersection Density
ESRI Partner ,[object Object]
Utilizes Network AnalystBasic Needs ,[object Object]
Street centerlineOther Inputs ,[object Object]
Ped/Bike/Greenway
Demographics,[object Object]
Asheville – Smith Mill Greenway Access Planning
Asheville – Proposed Smith Mill Creek Greenway Planned Urban Village Planned Urban Village
Asheville – Proposed Smith Mill Creek Greenway
Asheville – Proposed Smith Mill Creek Greenway
Asheville – Smith Mill Creek Greenway Patton Avenue (US 23/74) @ Louisiana Avenue ,[object Object]
Fair Connectivity, influenced by areas south of Patton
47% of parcels with RDI > 0.65,[object Object]
Asheville – Smith Mill Creek Greenway Patton Avenue (US 23/74) @ Louisiana Avenue ,[object Object]
Good/Fair Connectivity, influenced by new connections
53% of parcels with RDI > 0.65,[object Object]
Good/Fair Connectivity, influenced by new connections
53% of parcels with RDI > 0.65,[object Object]
Asheville – Smith Mill Creek Greenway Leicester Hwy Patton Avenue (US 23/74) @ Louisiana Avenue ,[object Object]
Excellent Connectivity, influenced by new connections
64% of parcels with RDI > 0.65Patton Louisiana
Asheville – Smith Mill Creek Greenway Leicester Hwy Patton Avenue (US 23/74) @ Louisiana Avenue ,[object Object]
Excellent Connectivity, influenced by new connections
64% of parcels with RDI > 0.65Patton Louisiana
Asheville – Smith Mill Creek Greenway RDI After: 0.71 RDI Before: 0.62
Asheville – Smith Mill Creek Greenway Leicester Hwy ,[object Object]
208 parcels (19%) had a minor change in RDI.
193 (18%) had a major change.Patton Louisiana
Asheville – Smith Mill Creek Greenway 					Parcels	     Total 		 Patton/Louisiana	RDI	> 0.65	    >0.65		Change - Baseline		0.62	47%	     517 of 1092	N/A   - Local		0.64	53%	     582		+ 6%     Connectors  - Crosswalks / 		0.71	64%	     704		+ 17%     Sidewalks +     Connectors
Downtown Raleigh Removing Transportation Linkages
Raleigh High Speed Rail: CSX vs. NS Crossings ,[object Object]
  North-south connectivity vs. east-west connectivity Glenwood Jones St.
Raleigh High Speed Rail: CSX vs. NS Crossings ,[object Object]
 Conducive to walking and bicycling.
Redevelopment potential of city-owned properties
Glenwood South District and access to downtown with few impedancesGlenwood Jones St.
Raleigh HSR: CSX vs. NS Crossings CSX Crossings: ,[object Object]
Impacts east-west connectivity to areas northwest of downtown. ,[object Object],[object Object],[object Object]
Example: Parcel to Station Station 31 Station 15 Average RDI = 0.58 Average RDI = 0.75
Fire Station Before After Change Parcel Impact Route Directness Index 1,115 (increased Fire Station Service Area  by 17%) 0.48 0.57 19% Intersection Density 56.0 <1% -- 55.9 Link-Node Ratio -- 1.09 1.10 <1%
Lakewood Sounder Access to Commuter Rail Station
Improving Station Connections Lakewood Example
RDI Analysis Before – without connections versus  After – with connections Non-motorized connection across tracks with supporting pathways study area is 1.0 mile radius
Rail Station RDI Baseline RDI  - Project Impact
Rail Station RDI Change ,[object Object]
Impacted parcels can be numbered for project prioritization,[object Object]
Rail Station Before After Change Parcel Impact Route Directness Index 2,300 0.63 0.77 23% Intersection Density 146 1.4% -- 144 Link-Node Ratio -- 1.29 1.30 < 1% Walk Score -- -- -- 89 of 100
Bellingham, wa Multi-Criteria Quality of Service
	Quality of Service through Connectivity “Level of service” not representative of the real issue behind pedestrian & bicycle usage. Not a capacity issue or delay issue. Quality of Service Quality of the network and route/facilities and attractors that generate non-motorized travel. Emerging research on active living, VMT reduction 5 D’s: Density, Diversity, Design, Destination accessibility, Distance to transit
Bellingham, WAConcurrency Quality of Service Metrics ,[object Object]
 Safety (SRTS)
 Transit
 Active Living
Weighted AverageService Area #9
Bellingham, WAConcurrency Quality of Service Metrics ,[object Object]
Safety (SRTS)
 Transit
 Active Living
Weighted AverageService Area #9
Bellingham, WAConcurrency Quality of Service Metrics ,[object Object]
 Safety (SRTS)
 Transit
 Active Living
Weighted AverageService Area #9
Bellingham, WAConcurrency Quality of Service Metrics ,[object Object]
 Safety (SRTS)
 Transit
Active Living

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Case Studies -- Measuring Connectivity

Editor's Notes

  1. Brent
  2. Don
  3. Brent
  4. RDI scores can be at the parcel level, which allows scores to be related to land use information. In other words, a transportation-land use nexus.
  5. Don
  6. Don
  7. Don
  8. Brent’s Analysis
  9. Brent’s Analysis
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  12. Brent’s Analysis
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  23. Brent’s Analysis
  24. Don