Design Principle - Connectivity and Permeability
Design Principle - Connectivity and Permeability
Design Principle - Connectivity and Permeability
www.healthyplaces.org.au
Overview
Connectivity affects the degree to which transportation networks such as streets, walking
and cycling paths, connect people to their destinations (including intermediate
destinations such as public transport services). Good connectivity provides easy access
to key destinations for pedestrians. Excellent connectivity actively seeks to discourage
car use by making local trips easier and more pleasant by foot than by car.
This project was funded by the Australian Government Department of Health and Ageing
Last updated 10 June 2009
When combined with mixed use planning (see separate Fact Sheet), a permeable path
network significantly increases the opportunities for residents to walk to undertake daily
tasks, rather than drive. Studies have proven a link between network connectivity and
use of active transport or car dependence (LUTRAQ, 1997; Kopelman et al, 2007).
This project was funded by the Australian Government Department of Health and Ageing
Last updated 10 June 2009
The Land Use Transportation and Air Quality (LUTRAQ) study for Portland, Oregon
showed that the odds of someone reporting that they walked for non-work purposes rose
by 14 per cent for each quartile increase in the level of street connectivity where they live
(King County ORTP 2005).
Increased connectivity (combined with increased density, mixed use planning and
good urban design) = increased walkability = better health
Many people refer to 400 metres being a reasonable distance for people to walk. This
stems from United States research in the 1960s. The purpose was to consider walking
distances to public transport facilities. A reasonable walking distance is likely to be
affected by location, topography, weather, pedestrian facilities, trip purpose and cultural
factors. While a five minute walk (the time taken for the average person to walk 400
metres) may seem like a reasonable benchmark, it will not provide for a persons daily
exercise needs alone. More recent studies have shown that people are willing to walk
much greater distances if the walking environment is favourable (an average of 1.2
kilometres in good conditions).
Active
Traffic
Street networks can make pedestrian movement easier than car movement.
Source: Booz & Co
This project was funded by the Australian Government Department of Health and Ageing
Last updated 10 June 2009
How to achieve?
Provide a grid path network - Spacing of pathways should optimise pedestrian
movement and discourage car movement such as the use of cul-de-sac roads
with pathways to enable pedestrian only access to the next street;
Plan new subdivisions based on pedestrian and cyclist movement in the first
instance before then fitting the road network into the plan;
Retrofit existing subdivisions by closing road space (particularly one leg of cross
intersections) while retaining cyclist/pedestrian paths (this makes pedestrian
movement safer and more attractive while also improving vehicle safety at these
intersections);
Provide footpaths on both sides of all streets except where the road surface is so
narrow that cars are expected to share the space with pedestrians.
Provide local employment, recreation and retail facilities;
Increase residential densities to support additional localised facilities (Over 30
dwellings per hectare will sustain a basic level of facilities within walking
distance);
Ensure pathway networks connect with arterial networks to travel longer
distances (particularly relevant for cycle use);
Australian Standard 1428 Parts 1 & 2, Part 13 AustRoads Guide to Traffic
Engineering Practice: Pedestrians, sets a minimum standard footpath width of
1.2m as adequate for most road and street situations except in commercial and
shopping environments, where pedestrian demands and accident risk may
require wider paths.
This project was funded by the Australian Government Department of Health and Ageing
Last updated 10 June 2009
Rule of Thumb
On average people are willing to walk one kilometre to reach a functional destination.
This is dependant on many factors including topography, weather and the walking
environment including directness of the route. By providing path connections around
every 100 metres a suburb will be highly permeable and more likely to encourage
pedestrian trips. Where major barriers (such as creeks and railway lines) make
connections expensive to provide, the network should confluence around fewer crossing
points spaced around 500 metres apart.
This project was funded by the Australian Government Department of Health and Ageing
Last updated 10 June 2009
Encourage
Highly interconnected path network providing choice of walking and cycling
routes that lead to local and regional destinations
Limited road space to encourage slower traffic speeds and higher pedestrian
amenity;
Limited road connectivity to encourage cars to use arterial roads rather than local
streets and promote walking as the local trip mode;
Closure of existing roads while maintaining pedestrian access to increase
pedestrian and vehicular safety by removing unsafe intersections;
Parking on street (rather than indented bays) to slow vehicle speeds;
Improved pedestrian and cyclist safety through the provision of safe street
crossings (See Safety and Surveillance and Active Transport Design Principles
for further information).
Require raised pavement crossings on all side streets in retail environments and
any other location where pedestrian safety is an issue (such as left turn slip
lanes);
Install way-finding signage that utilises heads-up displays;
Narrow road widths to increase pedestrian crossing opportunities and reduce
vehicle speeds; and
Construction of complete arterial and collector road networks early in the
subdivision process to enable bus routes to commence in their optimal (long
term) form.
Avoid
Gated communities as they restrict walking and cycling access and reduce the
connectivity and connectivity within and outside the local street network
Land uses, subdivision and design features that act as physical barriers and
impede access to key destinations
Cul-de-sacs except where pedestrian access is provided to link with other streets
Delaying construction of walking and cycling paths in new subdivisions, as
transport habits are difficult to change once established.
Use of roundabouts (prohibit them in retail and high pedestrian volume
environments).
This project was funded by the Australian Government Department of Health and Ageing
Last updated 10 June 2009
This project was funded by the Australian Government Department of Health and Ageing
Last updated 10 June 2009
REFERENCES
Australian Standard 1428 Parts 1 & 2, Part 13
AustRoads 1995, Guide to Traffic Engineering Practice: Pedestrians.
Black JL & Macinko J. 2008, Neighborhoods and obesity, Nutrition Review, Vol.66(1),
pp.2-20.
Booth KM, Pinkston MM, Poston WS. 2005, Obesity and the built environment, Journal
of the American Dietetic Association Vol.105 (Issue 5 Suppl 1), pp.110-117.
Frumkin H, Frank L. and Jackson R. 2004, Urban Sprawl and Public Health: designing,
planning and building for healthy communities, Island Press, Washington DC.
Gebel K, King L, Bauman A, Vita P, Rigby A, and Capon A., 2005, Creating Healthy
Environments: A Review of Links between the physical environment, physical activity
and obesity, NSW Health Department and NSW Centre for Overweight and Obesity,
Sydney.
Kopelman P, Jebb SA, Butland B. 2007, Executive summary: Foresight 'Tackling
Obesities: Future Choices' project. Obesity Review;8 Suppl 1:vi-ix.
LUTRAQ (Land Use, Transportation, and Air Quality) study in Portland, Oregon Making
the Land Use, Transportation, Air Quality Connection LUTRAQ 1999
http://www.onethousandfriendsoforegon.org/resources/lut_reports.html
Papas MA, Alberg AJ, Ewing R, Helzlsouer KJ, Gary TL, Klassen AC. 2007, The Built
Environment and Obesity, Epidemiologic Reviews, Vol.29, pp.129143.
Pikora TJ, Giles-Corti B, Knuiman MW, Bull FC, Jamrozik K, Donovan RJ. 2006,
Neighborhood environmental factors correlated with walking near home: Using
SPACES. Medical Science Sports Exercise Vol.38(4), pp.708-14.
Robertson-Wilson J, Giles-Corti B. Walkabilility, 2003, Neighbourhood Design, and
Obesity. In: Townsend T, Alvanides S, Lake A, editors. Obesogenic environments:
Complexities, perceptions and objective measures. UK: Wiley-Blackwell., in press.
TDM (Transport Demand Management) Encyclopedia 2008, Roadway Connectivity,
Victorian Transport Policy Institute Accessed 30 April 2009.
http://www.vtpi.org/tdm/tdm116.htm
This project is funded by the Australian Government Department of Health and Ageing
Last updated 10 June 2009
FURTHER READING
Dill J, 2005, Measuring Network Connectivity for Bicycling and Walking, School of Urban
Studies and Planning, Portland State University (http://web.pdx.edu/~jdill).
Ewing R, 1996, Best Development Practices; Doing the Right Thing and Making Money
at the Same Time, Planners Press www.planning.org.
Goldberg, D., McCann, B., Frank, L., Chapman, J. & Kavage, S., 2007, New Data for a
New Era: A Summary of the SMARTRAQ Findings Linking Land Use, Transportation, Air
Quality and Health in the Atlanta Region, SMARTRAQ Summary Report, University of
British Columbia, Canada.
http://www.act-trans.ubc.ca/smartraq/files/smartraq_summary.pdf
Ewing, R, Schmid T, Killingsworth R, Zlot A, and Raudenbush S, 2003, Relationship
Between Urban Sprawl and Physical Activity, Obesity, and Morbidity, Urban Ecology
pp.567-582.
Handy S, Paterson R, Butler K. 2003, Planning for street connectivity: getting from here
to there, American Planning Association, Chicago.
Hoehner CM, Ramirez LKB, Elliott MB, Handy SL, Brownson RC. 2005, Perceived and
objective environmental measures and physical activity among urban adults. American
Journal of Preventive Medicine, Vol.28 (2), pp.105-116.
Pikora T, Giles-Corti B, Bull F, Jamrozik K, Donovan R. 2003, Developing a framework
for assessment of the environmental determinants of walking and cycling, Social
Science Medicine, Vol.56:1693703.
Saelens B, Sallis J & Frank L, 2003. Environment correlates of walking and cycling:
Findings from the transportation, urban design and planning literatures, Annals of
Behavioural Medicine, Vol.25(2), pp.80-91.
Transportation Research Board, 2005. Does the built environment influence physical
activity? Examining the evidence. Transportation Research Board, Washington, DC.
Whitzman C, 2008. Institutional Barriers and Enablers to Childrens Independent
Mobility, Presentation to Planning Institute of Australia Congress 2008, University of
Melbourne. www.bv.com.au/file/Planning%20Institute%20Congress%2008.ppt
This project is funded by the Australian Government Department of Health and Ageing
Last updated 10 June 2009