Permit FAQ Series - Bridge Video Supervision
At the end of September, we released a series of Bridge Video Supervision (BVS) instructional videos, that were commissioned by the Main Roads Structures Engineering Branch. The videos have been produced for industry to illustrate the required positioning for overmass vehicles when crossing various bridge types e.g. single lane, divided carriageway, under BVS conditions.
There are also several bridge specific videos that illustrate the required positioning for overmass vehicles when crossing the bridge, under specific BVS conditions e.g. central movement required in the direction of travel only, with the exclusion of traffic in the direction of travel.
Transport operators are reminded that they must check their issued permits, prior to leaving, to ensure all drivers are aware of any bridge(s) where BVS conditions apply and appropriate auditable records for each crossing are kept.
To ensure bridge infrastructure is protected, it is vital that overmass vehicles crossing bridges under BVS conditions comply with all the requirements.
Links to the new videos are available under the Bridge Video Supervision section on the Oversize Overmass (OSOM) page on our website and they can be accessed directly via the Main Roads Western Australia YouTube channel.
Roll-coupled BA-Triple Combination now allowed under the 36.5 metre Roelands Hill Permit
In October, HVS announced that following independent assessment, the BA-Triple combination (Category 7B) fitted with a roll-coupled drawbar coupling connection can operate under the 36.5m Roelands Hill Permit.
Previously, the BA-Triple combination was excluded from this higher risk access, due to poorer stability performance when compared to the AB-Triple, resulting from the dog trailer being at the rear of the combination.
In response to requests from industry to re-consider the BA-Triple combination under this access approval, HVS commissioned an independent vehicle performance assessment to establish how the safety performance of the BA-Triple combination will improve if fitted with a roll-coupled coupling connection between the middle trailer and the rear dog trailer.
The outcomes of the assessment demonstrated the BA-triple had improved safety and stability performance over the AB-Triple when fitted with the roll-coupled drawbar coupling connection. As such, we have updated the permit conditions to allow the BA-Triple combination fitted with a roll-coupled drawbar coupling connection, with no more than ±2° of lash (maximum 4° total lash).
As part of the updated pre-permit requirements, an operator applying for the BA-Triple combination under this permit must provide video evidence showing the fitted roll-coupled drawbar coupling connecting, and written confirmation from the trailer manufacturer or coupling manufacturer that it meets the maximum lash requirements.
The updated 36.5 metre Roelands Hill Permit Eligibility & Supporting Evidence Checklist and permit application form are available on the Specific Access Permits on our website.
For further information, please contact the Heavy Vehicle Helpdesk on 138 486 or email hvs@mainroads.wa.gov.au.
Out and About with HVS
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