The ATA has provided a measured response to the NHVR’s proposed updates to the Performance Based Standards for Static Rollover Threshold (SRT), Rearward Amplification (RA) and High Speed Transient Offtracking (HSTO).
The submission supports the overall direction of the reforms, particularly the intent to incorporate modern stability control technology better and to clarify the SRT requirements for dangerous goods vehicles.
The submission identifies several areas requiring further development to ensure the revised standards are practical, consistent and effective.
The submission cautions that the proposed ESC / RSC modelling approach is incomplete, with key behaviours not yet represented, creating the risk of inconsistent assessments. New dynamic test manoeuvres also remain in proof-of-concept form and will require defined criteria before they are implemented.
The submission stresses the need for nationally consistent guidance on RA and HSTO pathways, broader clarification on the use of Lateral Transfer Ratio and robust protocols for reduced speed testing. It also emphasises the need to ensure the in-service performance of stability systems through complementary compliance measures.