Roadworks and Detour Requirements for Heavy Vehicle Access

Every effort must be made by roadworks project teams to ensure heavy vehicle combinations with as-of-right access are accommodated on approved mapped roads during all roadworks requiring full road closure, lane narrowing and/or detours.

Roadworks, disruptions & detours update

Roadworks closures are now shown as a viewable layer of Planned & Unplanned Disruptions on all of Victoria's Heavy Vehicle Map Networks.

Previously Victoria's HV Maps were updated weekly to include roadwork closures and detours of 10 days or more.

Road closures, roadworks (full, nightworks and/or lane closures) are now viewable by toggling the layer on the bespoke map network you choose. NOTE: Required detours will only be added to HV networks if a proposed detour route is NOT already mapped as approved (green) or conditionally approved (orange).

The Planned & Unplanned Disruptions layer is sourced from the Department of Transport - Data Exchange Platform. Data is refreshed daily. Further information on the API used for the layer can be found here (External link)

Heavy vehicles (HVs) with as-of-right access are all those heavier, longer, wider or higher trucks, cranes or buses operating on bespoke mapped networks. All networks where HVs can legally operate are shown on the Heavy Vehicles map networks in Victoria page. These 90+ HV networks are either gazetted (linked to National Heavy Vehicle Regulator (NHVR) gazette notices) or pre-approved (linked to NHVR consent permits).

Similar to cars and light vehicles, heavy vehicles with as-of-right access must therefore be considered at all times when a project team is undertaking works on any part of Victoria’s road network. Unlike cars or light vehicles, some heavy vehicle combinations only have access to a limited number of roads. Being larger, wider and heavier than cars, these heavy vehicles therefore require more space and stronger infrastructure to operate on the road network.

Roadworks which limit or restrict access for as-of-right heavy vehicles will have a detrimental impact on the heavy vehicle industry and its customers unless efforts are made by the project team to ensure continued access for all heavy vehicles approved to operate along the route along which the road/structure is being built/upgraded.

HVs must be allowed to continue to operate to enable operators to carry out their business during roadworks. To do so, appropriate detours must be provided by the responsible project team, either on other DoT-managed arterial roads or on Local Government Authority-managed (LGA) local roads.

This flowchart [PDF 223 Kb] has been updated to help project teams identify if, and how, their roadworks might affect heavy vehicle access. By following the flowchart advice project teams will be able to make informed decisions that will limit or eliminate disruption to HV access.

To identify if the proposed roadworks have an impact upon access of any mapped or consented Heavy Vehicle (HV) network.

Checklist 1: Follow for dimension/mass and geometry requirements

  1. Key mapped heavy vehicle types, including their dimension and mass thresholds, are outlined in the table below.
  2. Intersection changes require a low speed swept path assessment (5km/h).
Maximun Dimension
and Mass Limits
Height (m) Width (m) Length (m) Low Speed
Swept path (m)
Mass (t)
B-Doubles  4.6  2.5  26.0  8.7  68.5 
PBS/HPVS  4.3  2.5  36.5  10.6  113.5 
Oversize/Overmass vehicles 5.0  5.0  30.0  Varies  100.0 
Class 1 Agricultural Vehicles  5.0  Up to 6.5*  35.0  Varies  45.0 
Platform Trailers  6.0  6.0  44.0  Varies  206.0 
* Refer to OSOM map to determine width requirement

Note: If roadworks lane width or height clearance is in excess of the above table limits, and intersections don’t accommodate the existing access, then roadworks DO impact on heavy vehicle networks. 

To identify if an alternative detour be identified on all mapped HV networks affected by roadworks.

Checklist 2: Follow to identify alternative detour(s)

1.  Re-assess dimension/mass and geometry requirements detailed in Checklist 1 for suitability of the alternative route(s).

2.  Identify if there are any bridges on the alternative detour and request bridge assessment. Please note that bridge assessments will include a fee, payable by the project team, and depending on complexity, an assessment can take at least several weeks.

  • DoT managed bridges need to be assessed by DoT bridge team.
  • Council managed bridges need to be assessed by the relevant council.

3. Identify conflicting roadworks or events in the vicinity during the detour period.

  • Check DoT Planned Disruptions layer on each HV map, and contact DoT Disruptions Team for further details.
  • Contact council directly to identify roadworks on local roads.

4. Consider other factors too, including truck curfews, LGA-imposed restrictions, etc.

Note: If any criteria from this Checklist cannot be met, then project team must reconsider roadwork plans.

The flowchart should be followed at all times and, if advice is still required after review, any enquiries relating to HV roadworks and detours can be directed to,

  1. DoT’s Freight Victoria Land Freight System Team ( Policy & Strategy) by emailing [email protected].
  2. National Heavy Vehicle Regulator – [email protected]
  3. DoT Heavy Vehicle Consent Team – [email protected]
  4. DoT Bridge Team – TBC
  5. DoT Disruptions Team – TBC

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