After a collision: response, reporting and investigation

Even with good training and careful driving, collisions happen. What drivers and employers do in the minutes, hours and weeks afterwards matters: for the safety of the people involved, for legal and insurance obligations, and for preventing the next collision. This lesson covers what to do at the scene, how to report to police, insurers, regulators and the employer, and how to investigate collisions to find and fix their causes. HSE-403 covers incident investigation and root cause analysis in more depth.

At the scene: first priorities

The first priority after a collision is safety: preventing further harm to yourself, the other people involved and passing traffic. Stop as soon as it is safe; leaving the scene of a collision is a serious offence in every jurisdiction. Turn on hazard lights. If the vehicles can be moved and no one is seriously injured, move them out of traffic where local rules allow. Otherwise, stay in the vehicle with your seatbelt on if it is dangerous to get out, or get out on the side away from traffic and move behind a barrier or well off the road. Set out warning triangles or flares if you have them and it is safe.

If a vehicle is carrying dangerous goods, keep people away and follow the emergency response information carried with the shipment; HSE-250 covers this. If there is a fuel leak or fire, move everyone well away and upwind. Electric vehicles that have been damaged can catch fire hours after a crash, so first responders should be told the vehicle is electric.

Gathering information

Good information collected at the scene helps police, insurers and the employer's investigation. Take photos of all vehicles from several angles, the positions of vehicles before they are moved where safe, damage, the road, signs and signals, skid marks, debris, weather and light conditions. Get the names and contact details of witnesses before they leave. Note the time, location, direction of travel and what happened, in plain factual terms. Many fleets provide a collision kit with a form, a pen and a disposable camera or a phone app that guides drivers through these steps.

Be polite but do not admit fault, apologize in a way that could be taken as admitting liability, or discuss who was to blame. Fault is decided later by police and insurers, and statements made in shock at the scene are often wrong. Give police the facts. If you are unsure, say so.

Reporting to police and licensing authorities

Each province sets its own rules for reporting collisions to police. In Ontario, for example, collisions involving injury, a suspected criminal offence such as impaired driving, or damage above a set threshold must be reported, either to police at the scene or at a collision reporting centre within a set time; the threshold for combined property damage is $2,000. Other provinces have similar rules with different thresholds and procedures. Commercial carriers must also follow provincial requirements for recording collisions in their carrier safety records.

Post-collision testing

Some employers, particularly in safety-sensitive transport operations, have policies requiring drug and alcohol testing after a significant collision. In Canada there is no general federal requirement for post-incident testing of commercial drivers in domestic operations, and testing policies must respect human rights law and court decisions on workplace testing. Canadian carriers whose drivers operate commercial vehicles into the United States must follow US Department of Transportation testing rules for those drivers.

Reporting to the employer and to workplace authorities

Drivers should report every collision to their employer as soon as possible, however minor, and every injury. Many fleets also want reports of near misses and incidents such as hitting a pole in a parking lot. Prompt reporting lets the employer support injured workers, deal with insurers, meet legal deadlines and learn from the event. Employers should make reporting easy and avoid automatic punishment, because drivers who fear discipline hide minor collisions, which removes the chance to fix causes before something worse happens.

A worker injured in a work-related collision is entitled to workers' compensation in every province, and employers must report the injury to the provincial workers' compensation board within a set time, such as within three days of learning of it in Ontario. Critical injuries and fatalities must also be reported under occupational health and safety law, and may be investigated by OHS inspectors as well as police.

# Reporting deadlines checker for an invented collision (illustrative; check your jurisdiction).
from datetime import datetime, timedelta
crash = datetime(2026, 10, 14, 16, 40)
deadlines = {
    "Tell supervisor": timedelta(hours=1),
    "Company collision report form": timedelta(hours=24),
    "Insurer notified": timedelta(days=2),
    "Workers' compensation report (example: 3 days)": timedelta(days=3),
    "Police or reporting centre (example: within 24 h if not at scene)": timedelta(hours=24),
}
for task, delta in deadlines.items():
    print(f"{task:62s} by {(crash + delta):%a %d %b %H:%M}")

Tell supervisor                                                by Wed 14 Oct 17:40
Company collision report form                                  by Thu 15 Oct 16:40
Insurer notified                                               by Fri 16 Oct 16:40
Workers' compensation report (example: 3 days)                 by Sat 17 Oct 16:40
Police or reporting centre (example: within 24 h if not at scene) by Thu 15 Oct 16:40

Investigating collisions

Every collision and near miss is an opportunity to learn. The purpose of an investigation is not to assign blame but to find all the factors that contributed and fix the ones the organization can control. Investigations should be proportionate: a scraped bumper in a parking lot might need a short review with the driver, while a collision with injuries needs a full investigation by a trained team.

Telematics and in-cab video, covered in lesson 11, have transformed fleet investigations. Data on speed, braking, location and time can show what happened in the seconds before a crash, and forward-facing video can show what the driver could see. These tools also often clear drivers of blame when another driver caused the crash. They must be used fairly and in line with privacy law and company policy.

A common tool for finding causes is to keep asking why until you reach factors the organization can change. For example: the driver rear-ended a car. Why? He was looking at the tablet. Why? Dispatch sent a job change. Why? The dispatch system sends messages to moving vehicles. Why? No one had set it to hold messages while the vehicle is moving. The corrective action, changing the dispatch system, prevents the same collision for every driver, not just this one.

Supporting the people involved

Collisions are frightening, even when no one is badly hurt. Drivers may feel shaken, guilty or anxious about driving again, and these reactions can affect their attention for days. Supervisors should check on drivers after any collision, arrange medical assessment where needed, and avoid sending a shaken driver straight back on the road. Employee assistance programs can help with stress after serious incidents. Showing care at this moment also builds the trust that makes drivers willing to report future incidents honestly.

Working with insurers and legal processes

Report collisions to the insurer as soon as possible and follow the policy's procedures. Insurers may want photos, the collision report, witness details and repair estimates. If police lay charges against a driver, or a lawsuit follows, the employer's records of training, inspections, hours and telematics will matter. Keep collision files complete and organized, and get legal advice before giving formal statements in serious cases. Drivers should not post photos or comments about a collision on social media.

Breakdowns and other roadside emergencies

Many of the same steps apply when a vehicle breaks down. Signal and move as far off the road as possible, ideally onto a wide shoulder or off the highway altogether. Turn on hazard lights, set out triangles if it is safe, and stay in the vehicle with your seatbelt on if you are on a busy highway with no safe place to stand, or get out on the side away from traffic and stand well back behind a barrier if you can. Call your employer and roadside assistance. In winter, follow the stranded-vehicle advice in lesson 7. Never attempt repairs, such as changing a tire, on the traffic side of a vehicle on a busy road.

Fires and electric vehicles

If a vehicle catches fire, stop, turn off the engine, get everyone out and well away, at least 30 m (100 ft), and call 911. Do not open the hood, because air feeds the fire. Small engine fires can sometimes be controlled with a portable extinguisher by a trained person if it is safe, but people come first. Lithium-ion battery fires in electric vehicles can reignite hours or days later and need special handling by firefighters, so tell responders the vehicle is electric.