Coroner's Finding: Spiess, Thomas Wolfram and Byrne, Jacqueline
Deceased
Thomas Wolfram Spiess and Jacqueline Byrne
Demographics
unknown
Date of death
2014-08-18
Finding date
2026-08-28
Cause of death
Thomas Wolfram Spiess: head, neck and chest injuries; Jacqueline Byrne: multiple injuries
AI-generated summary
On 18 August 2014, a 14-tonne effluent truck lost control on South Eastern Freeway's steep downhill section and struck multiple vehicles at high speed, killing Thomas Spiess (aged 56) and Jacqueline Byrne (aged 41). Spiess died at the scene; Byrne died in Royal Adelaide Hospital after emergency treatment. The truck approached the intersection at approximately 140 km/h. Investigation revealed the driver failed to select an appropriate low gear, the truck's brakes were faulty, and speed limits for trucks with fewer than five axles were inadequate. The inquest was delayed 12 years due to criminal proceedings but was concluded in 2026. The coroner affirmed previously-made recommendations already implemented by government, which substantially improved road safety. No new recommendations were made. Measures implemented included uniform 60 km/h speed limits for all heavy trucks, extended low-gear requirements, improved signage, and arrester bed enhancements, resulting in zero heavy-truck fatalities in the subsequent decade.
AI-generated summary and tagging — may contain inaccuracies; refer to original finding for legal purposes.
Error types
Contributing factors
- Truck driver failed to select appropriate low gear for downhill descent
- Truck's brakes were faulty, preventing effective gear changes
- Excessive vehicle speed at intersection (approximately 140 km/h)
- Inadequate speed limit for heavy trucks with fewer than five axles
- Driver did not use available arrester beds (safety ramps)
- Company assigned driver to route without adequate vehicle evaluation
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