Every fatal or near-fatal collision in Victoria triggers a process most people never see. The road is closed. A specialist unit attends. A reconstruction is built. Forensic samples are taken. Months later, sometimes more than a year later, charges may be laid, or a coronial brief is finalised, or the file is closed without further action. Our newsroom has been asked, more than once, what actually happens between the moment the road is taped off and the moment a charge is read out in a Magistrates’ Court. Mei Calloway has put together this explainer.
This piece is general. It is not a comment on any individual matter. The aim is to set out, clearly, how serious-collision investigations are run in Victoria, what the relevant offences are, and where the legal thresholds sit.
The first hour
The first uniformed officers on scene are normally local highway patrol or local police service area response units. Their immediate priorities are the welfare of the people involved, traffic management, scene preservation and a fast initial assessment of whether the matter is going to be handled locally or escalated.
The escalation threshold is well-defined. A fatality, life-threatening injury, multiple casualties, or any indication that the cause is potentially criminal pushes the file to the Major Collision Investigation Unit — MCIU — within Road Policing Command. Where MCIU takes carriage, the local response moves into a supporting role. The scene is held until MCIU arrives, often for several hours.
Scene preservation is harder than it sounds. Fluid leaks dry. Skid marks fade. Debris gets moved by passing emergency vehicles. The first officers on scene have to balance the urgent demands of medical response and traffic safety with the longer-term need to keep the physical evidence intact for a unit that is still half an hour away.
The reconstruction
Crash reconstruction is a forensic discipline with its own peer-reviewed literature. The MCIU reconstruction officers who lead Victorian fatal-collision scenes are accredited and use a defined set of techniques.
The starting point is the survey. Total-station equipment maps the scene to centimetre accuracy. Drones now do much of what used to take a team of officers a full day with measuring wheels and chalk. The output is a three-dimensional model of the scene that can be presented in court, run through simulation software and compared against the physical evidence.
From the survey, reconstruction proceeds along several parallel threads:
- Speed estimation. Crush damage on each vehicle, skid distances, post-impact trajectories and the application of conservation-of-momentum equations produce a defensible range of pre-impact speeds.
- Impact geometry. The angle and point of impact between vehicles or between a vehicle and a fixed object are inferred from damage patterns and the resting positions.
- Lamp-filament analysis. The state of headlight and indicator filaments at the moment of impact — whether hot or cold, intact or shattered — can establish whether lights were on, whether indicators were operating and similar questions.
- Tyre and brake examination. Tread depth, brake pad condition, hydraulic system integrity. Mechanical defects are sometimes a contributing cause and have to be excluded or established.
- Electronic data. Most modern vehicles carry an event data recorder — sometimes called the “black box” — that captures speed, throttle position, brake application and seatbelt status in the seconds before a crash. Downloading that data is now routine in MCIU investigations.
The reconstruction is documented in a written brief that runs to hundreds of pages. It will be tested by defence experts if the matter goes to trial. The standards expected of a Victorian reconstruction brief are high, and there is a long line of Court of Appeal authority on what constitutes a defensible reconstruction.
Blood, drugs and breath
Victoria’s drug and alcohol testing regime for serious collisions is set out in the Road Safety Act. Where a driver is involved in a collision causing death or serious injury, blood and oral fluid testing is mandatory. The blood sample is taken at hospital under section 56 of the Act and analysed by the Victorian Institute of Forensic Medicine. The oral fluid sample is screened roadside or at hospital and confirmatory analysis follows.
The relevant prescribed concentrations are well known: 0.05 BAC for full-licence holders, zero for probationary and learner drivers. For prescribed illicit substances — methamphetamine, MDMA and tetrahydrocannabinol — any detectable quantity is an offence, separate from the question of impairment.
Where the driver is incapacitated, blood is taken without consent under the Act. Where the driver has died, post-mortem toxicology is conducted as part of the coronial examination. The toxicology results feed directly into the charging decision.
The charges
Several offences cover the territory of serious-collision driving. The principal ones, in declining order of seriousness:
Culpable driving causing death (Crimes Act section 318) — maximum 20 years’ imprisonment. The threshold is high. The prosecution must prove driving that was reckless, grossly negligent, or under the influence of alcohol or drugs to a degree affecting the capacity to drive properly. This is the charge for the worst categories of driving conduct.
Dangerous driving causing death or serious injury (Crimes Act section 319) — substantial maximum penalties. The threshold is “speed, manner or other circumstances dangerous to the public”, which is meaningfully easier to prove than culpable driving. This is the most commonly laid serious-collision charge in Victoria.
Failing to stop after a motor vehicle accident where a person is killed or seriously injured (Crimes Act section 319AA) — maximum 10 years’ imprisonment. Introduced in 2018 as a standalone offence to capture the particular wrong of leaving the scene.
Drink and drug-driving causing death or serious injury — covered partly by the Road Safety Act and partly by the Crimes Act, depending on circumstances.
Negligently causing serious injury (Crimes Act section 24) — used in some collision cases where the driving conduct has fallen below the dangerous-driving threshold but the outcome has been catastrophic.
The charging decision is made by the Office of Public Prosecutions on the brief assembled by MCIU. The decision turns on the strength of the evidence, the public interest, and the realistic prospect of conviction. Charges can be laid weeks, months or sometimes more than a year after the collision itself, particularly where the reconstruction is complex or where toxicology has needed extensive analysis.
The coronial track
Every fatal collision in Victoria is also a coronial matter. The coroner takes evidence from MCIU, from the medical examiners, from witnesses, and from any other relevant source. The coronial inquest can run in parallel with criminal proceedings or, more commonly, after them. Coronial findings often produce systemic recommendations — about road design, signage, vehicle safety, licence systems — that feed into longer-term road-safety policy.
The Coroners Court of Victoria publishes its findings. The systemic recommendations are tracked publicly and agency responses are published. The Court has been increasingly willing to make findings about identified blackspots and to push the Department of Transport and Planning on engineering solutions.
What it means for families
For families of those killed or seriously injured, the investigation timeline can be hard. Months of waiting, with limited information shared, are normal — the requirements of the criminal process and the coronial process both constrain what investigators can say. The MCIU has dedicated family liaison officers whose job is to bridge that gap as far as the rules allow.
Road Trauma Support Services Victoria operates on 1300 367 797 and provides counselling and peer support to people bereaved or seriously injured in road incidents. The Coroners Court family liaison team is available throughout coronial proceedings. Lifeline is on 13 11 14.
