Oversize or overmass vehicles
Apply for an oversize or overmass permit
New OSOM notices
From Thursday 9 January 2025, oversize overmass (OSOM) notices will be introduced.
These notices will promote OSOM cross border access by allowing eligible vehicles to:
- travel at night
- have OS access during peak times
- no longer require a 3-year permit.
Eligible vehicles are those that meet dimension and vehicle type requirements, as per the notices.
For more information, call the permits officer on 08 8951 5263.
The assessment criteria for oversize and overmass vehicles is outlined in the permit guidelines PDF (5.0 MB).
The guidelines also outline exemptions that might apply to specific types of vehicles and loads. This includes:
- B-double overall length exemption
- 6.5 t steer axle mass exemption
- aggregate spreader box width exemption
- mechanical tarping and safety harness system width exemption
- 4.6 m high semi trailer exemption
- 14.6 m (48 ft) semi trailer length exemption.
For 7.1 t heavy vehicle steer axle mass exemption, read the information bulletin v75 heavy vehicle steer axle mass PDF (1.3 MB).
To apply for a permit of exemption from the maximum standard dimension and mass limits, read below.
How to apply
To apply, follow these steps:
Step 1. Fill in the oversize or overmass permit application PDF (934.1 KB).
Step 2. Send a copy to the relevant authorities and get authorisations as outlined below.
Step 3. Submit your application and supporting documents by emailing mvr.permits@nt.gov.au or by mail to:
Chief Transport Inspector
Vehicle Inspection Facility
PO Box 2520
Darwin NT 0801
Step 4. Pay the permit of exemption fee using Visa or MasterCard by calling the MVR office on 1300 654 628.
Get authorisations
Depending on your vehicle type, you may need to get authorisations from authorities including:
- Telstra or a telecommunications body
- the Power and Water Corporation (PWC)
- the Northern Territory (NT) Government department responsible for NT roads
- the NT Police
- a local government council
- a building certifier.
Find out below what authorisation your vehicle type needs for your application.
Vehicles with a height 5 m and above
Seven days before the journey, you must seek approvals from Telstra and email a copy of your completed application to high.loads.telstra@team.telstra.com.
You must also inform Power and Water Corporation (PWC) and email a copy of your completed application to your nearest PWC office:
- Darwin and Katherine - proximitypermits.pwc@powerwater.com.au
- Alice Springs and Tennant Creek - proximitypermits.southern@powerwater.com.au.
Vehicles with a height over 7 m
Ten days before the journey, you must email a copy of the completed application to your nearest PWC office:
- Darwin and Katherine - proximitypermits.pwc@powerwater.com.au
- Alice Springs and Tennant Creek - proximitypermits.southern@powerwater.com.au.
Vehicles with a height over 5 m and width over 7 m
Seven days before the journey, you must email a copy of your completed application to the NT Government department responsible for NT roads.
You can do this by emailing roadsdarwin.ntg@nt.gov.au.
Vehicles with a width over 7.5 m
At least 28 days before the journey, you must email a copy of your completed form to NT Police.
You can do this by emailing wideloadescorts@pfes.nt.gov.au.
Vehicles with a width over 6 m - for council-owned roads only
At least 7 days before the journey, you must email copy of your completed form to your local council.
You can use the contact details provided on your application.
Vehicle moving a house
You must seek the approval of a building certifier.
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