View the Tasmanian 23m B-double Network
This Class 2 network shows roads mapped in three categories: Approved (green), Conditionally Approved (orange) and Restricted (red). Click on a route or bridge to show any conditions that apply.
This network shows access for Class 2 B-Doubles which do not exceed 23m overall length and comply with the National Class 2 B-double Authorisation Notice 2026.
Maximum vehicle dimension for this network are up to 23m overall length and 4.3m overall height.
Restricted structures (red dots) must not be crossed.
Roads not shown as approved (green) or conditionally approved (orange) require road manager approval for access by permit. Application for access by permit is to be made through the NHVR. It is permitted to travel off route if the road is marked with detour signage or if directed by an authorised officer.
Operators must check for road closures and road conditions prior to travel to ensure clear passage. For roads managed by Building Tasmania, this information is available by selecting “Road Works - State Roads" via the "Map Layers" icon on this map.
General roadwork information is available at the Transport website.
Higher Mass Limits (HML) Roads
Roads which are part of the Tasmanian Declared HML Route Network can be superimposed on the map by selecting “HML Advisory layer” via the “Map Layers” icon.
Over the HML network, Class 2 B-double heavy vehicle combinations which comply with the Tasmania Higher Mass Limits Declaration 2021 can operate with axle group masses up to 17.0t for a tandem axle group, and up to 22.5t for a tri-axle group.
A class 2 B-double at HML which exceeds 21.0m in length1 cannot operate over the Tasmanian Declared HML Route Network unless the road is also part of the Tasmanian 26 metre B-double Network or the Tasmanian 23 metre B-double Network (if not exceeding 23m length), or access has been granted by permit.
Relevant Notices and Schemes:
121.3m, if the trailer is fitted with a rear load-restraining guard that complies with the Forestry Safety Code.