TRANSPORT DATA CENTRE InfoSheet March 2010 What is a Travel Zone? Introduction Travel Zones (TZs) are the spatial base of the Transport Data Centre’s (TDC) data collection, transport modelling and analysis. TZs allow for detailed spatial analysis as they are smaller than Statistical Local Areas (SLA), but generally larger than an ABS Collection District (CD) or Mesh Block (MB). In order to provide for a similar level of trip generation across zones, TZs are different sizes across the metropolitan area. As with many other spatial boundaries, TZs tend to be small in areas with high land use densities and larger in areas of lower density. The key land uses of interest in defining TZs are employment, housing and transport infrastructure. As urban areas change over time, the TDC has created a new zoning system in line with each 5-yearly population census, the latest being 2006. Some Facts about Travel Zones The 2006 coverage has 2,690 TZs across the Greater Metropolitan Area (GMA) 2,277 TZs in Sydney Statistical Division (SD) 215 TZs in Hunter Statistical Sub-Division (SSD) 198 TZs in Illawarra SD an average of 34 TZs per SLA (ranging from 8 to 166) Typical TZ characteristics homogeneous land uses within each TZ boundaries following topographical features relatively constant population and area between zones made up of one or more MBs can be aggregated to SLAs contain no more than one freeway, interchange or train station Figure 1: Map of Greater Metropolitan Area (GMA) The basis of the 2006 TZ boundaries is the new ABS micro-level geographic unit called ‘Mesh Blocks’. Mesh Blocks are based on property boundaries and will eventually replace CDs. Information on mesh blocks is available from the ABS web site at www.abs.gov.au. TDC undertook a complete boundary redesign to arrive at the 2006 TZs. This involved moving zone boundaries, splitting zones and even combining zones. The goal was to allow for more detailed analysis of transport networks and travel behaviour at the TZ level. Transport Data Centre NSW Transport & Infrastructure• GPO Box 1620 SYDNEY NSW 2001 • Level 21, 227 Elizabeth Street, Sydney NSW 2000 Phone: (02) 9268 2211 • Facsimile: (02) 9268 2839 • Email: [email protected] • Web: www.transport.nsw.gov.au/tdc 1 InfoSheet March 2010 The guidelines for creating the 2006 boundaries were to minimise changes where possible to retain over time comparability align with MB boundaries align with SLA and Local Government Area (LGA) boundaries correct for boundary anomalies created by changes since the 2001 Census include one train station to a TZ avoid overlapping major transport network features where there is no access from one side to another make it possible to travel from one side of a TZ to the other side without having to go outside of the zone prevent multiple suburbs in each zone contain only one commercial centre account for planned developments unless they are expected to be very large or have a high level of employment. Example of a Travel Zone Map Further Information The Journey to Work User Guide describes zone changes from 2001 to 2011 (and previous years). © 2010 Crown Copyright Subject to copyright. All rights are reserved. Except as permitted under the Copyright Act 1968, no part covered by copyright may be reproduced or copied by any process or any means, electronically or otherwise, without written permission of the copyright owner. Disclaimer While all care is taken in producing and publishing this work, no responsibility is taken or warranty made with respect to the accuracy of any information, data or representation. The authors (including copyright owners) and publishers expressly disclaim all liability in respect of anything done or omitted to be done and the consequences upon reliance of the contents of this publication. Transport Data Centre NSW Transport & Infrastructure• GPO Box 1620 SYDNEY NSW 2001 • Level 21, 227 Elizabeth Street, Sydney NSW 2000 Phone: (02) 9268 2211 • Facsimile: (02) 9268 2839 • Email: [email protected] • Web: www.transport.nsw.gov.au/tdc 2
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