Trailer Magazine

Austroads shares draft guidelines for weighing OSOM trucks

  • Posted on Thursday 9th, November 2017.

Road transport and traffic agency, Austroads, has published draft guidelines for the weighing of oversized and overmass (OSOM) vehicle combinations using portable scales.

Austroads has said that the guidelines for weighing heavy vehicles does not address the weighing of OSOM vehicles and has aimed for a nationally-consistent procedure for assessing the mass of OSOM vehicles and develop Mass Measurement Adjustment (MMA) factors applicable to OSOM vehicles.

According to Development of National Mass Assessment Procedures for Oversize Overmass Vehicles, it has described the conduct of field trials involving repeated weighing of four different OSOM vehicle combinations and analysis to determine the level of accuracy to be expected during roadside inspections.

Testing was reportedly conducted at a roadside inspection site on the east-bound carriageway of the Cunningham Highway at Yamanto, Queensland. The site was surveyed to determine the location of suitable areas of pavement that complied with Austroads requirements for Category 1, 2 and 3 weighing sites, where Category 1 is effectively flat and Categories 2 and 3 involve progressively steeper longitudinal and transverse grades.

The Port of Brisbane inbound weighbridge was used to obtain the reference vehicle mass and to investigate the potential sources of variations in the measurements.

"Guidelines have been developed based on the test plan implemented during the field trial," Austroads said in a statement. "They include suggestions on weighing the combination when using several long scales, short scales and blocks. However, these guidelines are not exhaustive and will require input from experienced on-road staff on how best to apply them to other vehicle configurations."

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