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Segmentation of Road/ Footpath/ Kerb Asset Classes

  • 1.  Segmentation of Road/ Footpath/ Kerb Asset Classes

    Posted 17-03-2021 15:45

    Hello All

    We are in the process of reviewing our segmentation lengths recorded in our asset system for road/ kerb/ footpath assets.

    I would appreciate your shared experiences regarding any rules strategies or developed procedures around segmentation of these asset classes, particular within an urban setting, while meeting accounting standards.



    Jagath Pathirana
    Campbelltown City Council
    Pro Cert 2

  • 2.  RE: Segmentation of Road/ Footpath/ Kerb Asset Classes

    Posted 18-03-2021 15:05
    IPWEA Practice Note 9 (2015) - Road Pavements (Visual assessment) outlines "Segmentation and Componentisation" in accordance with URCOND90 and ROCOND90.

    I would suggest contacting the RMS (now TfNSW) transport library.


    The NSW TfNSW department uses ROADLOC system for chainages.

    Brendan Fuller
    Gladstone Regional Council
    design standards and regulations officer

    Pro Cert 2

  • 3.  RE: Segmentation of Road/ Footpath/ Kerb Asset Classes

    Posted 23-03-2021 14:19
    Hi Jagath,

    I'm not sure if you are aware of a Vicmaps initiative called 'Transport Data Model Review' established in 2019. Several councils including Melton City Council,  joined a ' Project Reference Group' that was formed by Robert Morrison in order to provide feedback,

    This initiative involves the standardisation of road segmentation rules to make it easier for the Grants Commission reporting and other general LG reports.
    The project is now back with Vicmaps for the next stage which will take into consideration all feedback from the Reference Grouop. We are hoping to align our segmentation to the outcome of this initiative and had given ourselves couple of years to achieve this (before the next road condition audit).

    It would be worth contacting Vicmaps to get some information.

    Melton City Council

    Pro Cert 2

  • 4.  RE: Segmentation of Road/ Footpath/ Kerb Asset Classes

    Posted 18-03-2021 15:05
    Austroads have a good guide

    Laura O'Dwyer
    Swan Hill Rural City Council

    Laura O'Dwyer
    Swan Hill Rural City Council

    Pro Cert 2

  • 5.  RE: Segmentation of Road/ Footpath/ Kerb Asset Classes

    Posted 18-03-2021 15:10
    Hi Jagath,

    Some notes below..

    • In an urban environment a maximum segment length of 250m seems to work well
    • Segments should break at seal type changes, condition changes, width changes. Think of the segments as similar packages of work that you are creating i.e. if the seal changes from new to old mid segment then how are you going to program works against that segment.
    • Given the above avoid creating segments in a desktop only environment - inspection in the field is necessary.
    • Avoid creating segments that are too short i.e. intersection to intersection only – this can make staging of capital works across segments more difficult and data collection more costly
    • Segments should be created to include history as much as possible – it is likely that your existing segments have been around for some time and that you have recorded a history of resealing / reconstruction and rehabilitation works against them. In many cases history is more valuable than condition.
    • Given the above if your segments are too long now consider splitting them with a view to retaining history against the old segment.
    • Ideally segments for footpath / kerb and road should break at the same points this makes staging of works across segments easier i.e. kerb replacement before a reseal / reconstruction and streetscape projects that include footpath renewal.
    • From a GIS point of view avoid polygons – polylines should be used in preference. Maintenance of line segments is much easier if say seal width changes in the future, also lines have direction.
    • Keep it as simple as possible the more complexity you add now leads to more complexity in maintaining the data moving forward.
    • Avoid creating different segments for intersections. In a local road network intersection will generally be treated the same as the adjoining road segment.
    • Consider your road hierarchy in establishing the segments.
    Hope this helps

    Steve Walker
    Asset Engineering

    Stephen Walker
    Asset Engineering Pty Ltd

    Pro Cert 2

  • 6.  RE: Segmentation of Road/ Footpath/ Kerb Asset Classes

    Posted 18-03-2021 19:01
    Hi Jagath,

    The general segmentation thumb rules are as under:

    1) Segmentation based on Road surface type.

    2) Segmentation of Kerb based on K&C Type.

    3) Segmentation of roads based on Asset hierarchy (Arterial/Collector/Local

    4) Segmentation based on segment length, minimum/maximum asset length (avoid 10m section, etc)

    Below are some general best practice –
      1. Have a common id to relate or map all assets.
        1. For instance, if Road Segment_ID is 001, then footpath should be FP_001_L (Footpath_001_Left), KB_001_L (Kerb_001_Left)
      2. Segment Footpath and Kerbs to match Road Network
      3. Make sure there are no overlaps or duplicates in the segments.
      4. Continues chainages where the segments are continues.
      5. Gaps in chainages where required
      6. Multipart feature should be fixed.
      7. Split intersections, roundabouts, etc. to separate polyline.
      8. Provide suffix to type of segments, for instance
        1. Roundabouts – 001_RB
        2. Bridges – 001_BD
      9. We generally recommend having segments less than 3 Kms in length for better management of assets

            Hope this is useful :)

            Dev Upadhyaya
            Pavement Management Service
            Manager - Data Service

            Pro Cert 2

          1. 7.  RE: Segmentation of Road/ Footpath/ Kerb Asset Classes

            Posted 19-03-2021 13:25

            ​The issue that arises with using the seal as the segment is that this can change length depending on you works philosophy. A road, between two intersections may have more than one seal and in the future a reseal could replace all of these with one seal. You may then have to re-segment your road. Here at BRCC we now reseal, where practical, longer lengths capitalizing on the economy of scale. Our segmentation is now based on intersection to intersection or bridge or something fixed. We then have the seals as a child asset of that segment.

            Parent level =ROAD A > B
            Child level =                   A: 0-100
                                                           A: 100-150
            The more rural road segments are again separated by a fixed feature (white fence post with green letterbox doesn't cut it anymore), this could be a bridge, significant bend trying to stay under 5km. Valuation and type data is stored at the child level for the seal but inspections and CAPEX is worked out at the parent level. Kerb &  Channel and Footpath are usually done over the whole length as in most cases there is little variation.  Road segmentation is then further based on the hierarchy and if its sealed or unsealed This aligns with the Road Management Plan. .  I don't generally separate intersections and allocate them to the main road, usually defined by the traffic management there. Roundabouts however are considered separate segments. I know a few other places that do this too have a layer for value and a layer for defect inspections.
            It might sound a lot more difficult but believe me its not as you are going to map the seals anyway. It does add an extra level in your register but you only have to do this once and your history can stay intact.

            Ashley Bishop
            Asset Management Coordinator
            Benalla Rural City Council

            Pro Cert 2

          2. 8.  RE: Segmentation of Road/ Footpath/ Kerb Asset Classes

            Posted 07-04-2021 09:57
            Hi Jagath

            thinkproject's asset management module RAMM provides a Dynamic Segmentation module as standard in the software solution. RAMM was developed in New Zealand and manages all NZ roads as well as a large % of Australia's roads, particularly in WA.

            Dynamic Segmentation divides your Roads into recommended Treatment Lengths with consistent performance and purpose which can be managed in a standard fashion along their length. You define parameters based on Road attributes such as Pavement Age, Condition, and Traffic volume. The application uses these to consider the characteristics and condition of the Road. Where there is a significant change, it creates a Treatment Length on each side of the change. You compare the recommended Treatment Lengths with your existing Treatment Length set. If you prefer the recommended set to the existing set, you apply it to your Network.

            If you want to find out any more don't hesitate to give me a call.


            John O'Sullivan
            RAMM Software
            Business Development Manager
            North Sydney

            Pro Cert 2