Plant Library

Transport Clearance Calculator

Check if your equipment requires oversize or overmass permits for road transport in Australia. Enter dimensions to see permit requirements and transport considerations.

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Search the Plant Library, or switch to your fleet to auto-fill transport dimensions from linked models.

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Equipment Dimensions

Standard limit: 2.5m

Standard limit: 4.3m

Standard limit: 19.0m (with trailer)

Standard limit: 42.5t

Australian Road Transport Limits & permit path

Standard Limits (No Permit)

  • Width2.5 m
  • Height4.3 m
  • Length (single vehicle)12.5 m
  • Length (with trailer)19.0 m
  • Gross Mass42.5 t

Over-Dimensional Thresholds

  • Class 1 OSOMPermit required
  • Width > 3.5mEscort required
  • Width > 5.0mPolice escort
  • Height > 4.6mRoute survey

When the result says “permit required”

  1. Check whether a national or state notice already covers the route and combination.
  2. If not covered, apply for a Class 1 OSOM permit through NHVR Go.
  3. For Northern Territory or Western Australia trips, apply directly to the relevant authority.

Have this ready before you apply

  • Loaded dimensions and gross mass
  • Vehicle / trailer combination details
  • Axle masses and spacings if relevant
  • Intended route and site access points
  • Confirmation the load is a large indivisible item
  • Any third-party approvals or supporting notes

Disclaimer: This calculator provides general guidance only. Actual permit requirements vary by state, route, and load configuration. Always verify with the relevant state transport authority before transport.

NHVR OSOM guidance|Do I need a permit?|Notices & permit-based schemes