Please be advised we have made changes to the Single Trip OSOM Vehicle Standard Operating Conditions to clarify block truck requirements and provide concessions relating to the overall length of the RAV when consisting of two or more towing vehicles.   

A summary of the changes are as follows:

• Where the RAV consists of more than one towing vehicle, e.g. two block trucks, or a prime mover and a block truck, an OSOM-TMP is not required unless the RAV exceeds 55 metres in length (refer sub-clause 5.4.3).
• Where an additional block truck is specified on the permit, the additional block truck forms part of the RAV and is included in the overall length measurements (refer sub-clause 8.6.1).
• When connecting an additional block truck (in accordance with the operating conditions) that is not specified on the permit, the length of the RAV may exceed the maximum length specified on the permit by the length of the additional block truck (refer sub-clause 8.6.8).
• Where the RAV is travelling outside the Metropolitan Area, or within the Metropolitan Area during Approved Night Hours, and consists of more than one towing vehicle, e.g. two block trucks, or a prime mover and a block truck, an escort vehicle is not required unless the RAV exceeds 55 metres in length (refer sub-clause 13.8.8).
• For the purpose of night curfews, if a RAV consists of two towing vehicles (e.g. two block trucks, or a prime mover and a block truck), the second towing vehicle (block truck) is excluded from the length measurement (refer sub-clause 14.1.2).

In addition, convoy provisions have been extended on Goldfields Hwy (refer Appendix 7). 

For further information, please refer to the Oversize Overmass (OSOM) webpage or contact the Heavy Vehicle Services Helpdesk on 138 486 or email hvs@mainroads.wa.gov.au .

4 February 2025

Please note:  This HVS Update will be published for 1 month.