First at a Road Traffic Collision? How to Help Without Becoming Another Casualty
Updated: Sep 14
Few drivers expect an ordinary journey to place them at the edge of an emergency. One moment the road ahead is familiar. The next, traffic has stopped, debris is scattered across the carriageway or a vehicle is sitting at an angle that immediately tells you something has gone badly wrong.
Being first at a road traffic collision can feel overwhelming. There may be injured people, moving traffic, damaged vehicles and no obvious person in charge. The instinct to rush towards a casualty is understandable, but the most useful response begins before you leave your own vehicle.
It begins with one question: can you help without creating another casualty?
This guide explains how an ordinary driver or passer-by can respond safely while emergency services are on their way. It is not a substitute for practical first aid training, instructions from a 999 call handler or directions from the emergency services. It is intended to help you understand the priorities, avoid common mistakes and approach an unfamiliar situation with a little more confidence.
The First Decision Is Whether It Is Safe to Stop
Stopping is not always the safest way to help.
A collision on a residential road, in a car park or on a quiet country lane may leave you with a reasonably safe place to pull over. An incident on a motorway, dual carriageway, blind bend or fast road can be very different. Stopping suddenly or positioning your vehicle badly could obstruct traffic, conceal the original collision or lead to another impact.
If you cannot stop in a place of relative safety, continue until you can do so and call 999. Reporting an incident accurately from a safe position is still a valuable response.
If you do stop, use your hazard warning lights and place your vehicle where it is less likely to be struck or become an obstruction. Do not stand between your vehicle and approaching traffic. Keep passengers, particularly children, away from the carriageway.
The Highway Code advises drivers who stop to help to use a place of relative safety wherever possible. On a motorway, never walk into live traffic and never place a warning triangle on the carriageway. If the road environment is unsafe, stay clear and tell the emergency services what you can see.
Good intentions do not make moving traffic less dangerous. The emergency services would rather arrive to one incident than find that a would-be rescuer has become another casualty.
Pause and Read the Scene
Before approaching, take a few seconds to look at the whole scene.
Are vehicles still moving? Is there broken glass, smoke, fire or leaking fluid? Is a vehicle unstable or resting against another object? Are there damaged power lines, hazardous goods or debris across the road? Can you hear approaching traffic that may not yet have seen the obstruction?
You are not expected to diagnose every hazard. The purpose of looking is to notice anything that makes approaching unreasonable.
Ask drivers to switch off their engines if this can be done safely. Keep cigarettes, naked flames and other ignition sources away from damaged vehicles. Do not crawl beneath a vehicle, reach into damaged machinery or attempt to disconnect a battery.
If other people have stopped, use calm and specific requests. Ask one person to call 999, another to keep uninjured people in a safe place and someone else to locate a defibrillator if it may be needed. Giving a task to a particular person is usually more effective than asking a crowd whether somebody has done it.
Electric and Hybrid Vehicles After a Collision
Electric and hybrid vehicles require awareness, but not panic. Petrol and diesel vehicles also present fire, fuel and mechanical hazards after a collision. The important point is that a modern vehicle may contain risks that are not immediately obvious.
An electric vehicle can be silent while its electrical system remains active. Do not assume that the vehicle is safely switched off simply because you cannot hear an engine. Do not touch exposed orange cables, damaged battery components or unfamiliar electrical equipment. Never attempt to isolate the high-voltage system yourself.
Keep away if you notice smoke, unusual heat, sparks, popping or hissing sounds, or a strong chemical smell. Tell the 999 operator that an electric or hybrid vehicle is involved and describe anything unusual that you can see, hear or smell. Move other people further away and follow the operator’s instructions.
Do not attempt to extinguish a fire involving an electric vehicle. Move to a safe distance and wait for the fire and rescue service. Damaged high-voltage batteries require specialist management, even when the vehicle initially appears quiet.
Many modern vehicles also contain airbags, pretensioners and other safety systems that may not all have activated during the original impact. Avoid leaning across undeployed airbags or placing yourself between a casualty and an airbag unit. Do not force doors, cut cables or interfere with damaged components.
These precautions are not a reason to abandon an injured person. They are a reminder that useful help must remain within safe limits. Speaking to a casualty from a safer position and giving clear information to the emergency services may be more valuable than entering a vehicle you cannot assess safely.
Calling 999 and Giving a Useful Location
Do not assume that someone else has called.
Dial 999 or 112 as soon as it is safe. Put the telephone on speaker if you need your hands free, but continue paying attention to traffic and your surroundings. The call handler can guide you through the immediate priorities and update the response as new information becomes available.
Give the location as precisely as possible. Include:
the road name or number;
the direction of travel;
the nearest junction, roundabout or landmark;
any visible marker post or emergency-area number;
the number and type of vehicles involved;
the apparent number of casualties;
whether anyone is trapped, unresponsive, bleeding heavily or having difficulty breathing;
any fire, smoke, leaking fuel, damaged electrical equipment or other hazard.
If a vehicle has an SOS or eCall facility, it may help transmit its location. A mapping application can also help you identify the road and direction of travel. On high-speed roads, the difference between northbound and southbound can materially affect how emergency services reach the scene.
Do not end the call until you are told to do so. The questions may feel numerous, but the information is helping the control room send the right resources.
Helping Without Moving People Unnecessarily
A conscious casualty may be frightened, confused or tempted to climb out immediately. Introduce yourself, explain that help is coming and encourage them to remain still unless there is an immediate danger.
Do not pull someone from a vehicle simply because they appear uncomfortable. The Highway Code advises that injured people should not be moved from their vehicles unless they are in immediate danger. Movement may worsen an injury, and damaged vehicles can be difficult to enter or leave safely.
There are circumstances in which remaining in place is more dangerous, such as developing fire or another immediate threat. These decisions can be extremely difficult. Tell the 999 operator exactly what is happening and follow the instructions you receive.
Do not remove a motorcyclist’s helmet unless it is essential and you are trained to do so. If the casualty is breathing, reassure them, monitor their condition and keep them as warm and dry as circumstances allow. Do not give them food or drink.
Calm communication is first aid. Statements such as “Help is on the way” and “Try to keep still” are more useful than promises that everything will be fine. Stay with the casualty if it remains safe, listen to what they tell you and report any deterioration to the call handler.
When Someone Is Unresponsive
If it is safe to reach the casualty, speak loudly and check for a response. An unresponsive person requires urgent assessment and emergency assistance.
Open the airway and check whether they are breathing normally, following the guidance from the 999 operator. Occasional gasps are not normal breathing and can occur during cardiac arrest.
If the casualty is not breathing normally, the call handler will guide you towards CPR and the use of a defibrillator. Access may be complicated if the person is still inside a damaged vehicle. Do not attempt a dangerous or technically difficult removal by yourself. Explain the position clearly and follow the instructions you are given.
Where the casualty can be reached and CPR can be started safely, chest compressions should begin as quickly as possible. Ask somebody to find the nearest automated external defibrillator, commonly called an AED. Public-access defibrillators provide spoken or visual instructions and will only advise a shock when an appropriate rhythm is detected.
Read more about how a defibrillator works and whether anyone can use one.
A real roadside emergency may be noisy, cramped and distressing. Practical training cannot remove those difficulties, but it can make the sequence of actions more familiar.
Serious Bleeding at a Collision
Life-threatening bleeding requires urgent action, but only when the casualty and wound can be reached without exposing you to traffic, fire, unstable vehicles or other hazards.
Wear protective gloves if they are available. Apply firm, direct pressure using a first aid dressing or the cleanest suitable material available. If something is embedded in the wound, do not remove it. Apply pressure around it and tell the emergency services what you have found.
Severe bleeding control may involve wound packing, haemostatic dressings or a tourniquet, but these interventions are best supported by suitable training and equipment. Follow the instructions of the 999 call handler and work within what you know how to do.
DTMK’s guide to catastrophic bleeding and workplace training explains the wider bleeding-control approach. Our separate tourniquet guide examines when specialist equipment may be appropriate.
Road traffic collisions can produce visually dramatic injuries, but the same priorities remain: protect yourself, summon help, control immediately life-threatening bleeding when you can do so safely and continue monitoring the casualty.
What Not to Do
People rarely make poor decisions because they do not care. Problems arise when urgency pushes them beyond what is safe or useful.
Do not:
stop where your vehicle creates another hazard;
walk into live motorway or high-speed traffic;
smoke or allow flames near damaged vehicles;
touch exposed electrical cables or damaged high-voltage components;
attempt to extinguish an electric-vehicle battery fire;
force entry into an unstable or badly damaged vehicle;
remove an injured person unless there is an immediate danger;
remove a motorcyclist’s helmet unless it is essential and you are trained;
remove an object embedded in a wound;
give an injured casualty food or drink;
photograph or film casualties;
make assumptions about their condition or promise that they will be fine.
The most effective bystander is not necessarily the person performing the most dramatic action. It may be the person who reports the exact location, keeps others away from danger, follows the call handler’s instructions and provides calm reassurance until help arrives.
When Several People Need Help
A collision involving several casualties can make it feel as though you must assess and treat everyone at once. You cannot.
Tell the emergency services how many people appear to be involved and identify immediate concerns, such as someone who is unresponsive, not breathing normally, trapped or bleeding heavily. Ask other capable bystanders to remain with conscious casualties while you follow the priorities given by the call handler.
Do not move through unsafe traffic or enter unstable vehicles in an attempt to reach
everybody. Emergency services have protective equipment, traffic-management powers and specialist rescue capabilities that members of the public do not.
Your role is to make a useful difference without expanding the emergency.
When the Emergency Services Arrive
Make yourself visible without standing in the road. Give a concise handover to the first crew that approaches you.
Explain:
what you saw when you arrived;
what hazards you identified;
how many people appear to be involved;
who was unresponsive or bleeding;
what first aid has been provided;
whether an AED has been attached or a shock delivered;
any change in a casualty’s condition;
anything the casualty told you about pain, medication or medical conditions.
Once emergency personnel take over, follow their directions and move away if asked. Police, ambulance, fire and traffic officers may need space to work, control the road or reach equipment.
You may feel that stepping back means you are no longer helping. In reality, a clear handover followed by allowing trained teams to work is part of an effective response.
The Emotional Impact of Being First on Scene
Even when you were not involved in the collision, what you see and do may remain with you afterwards. People can experience shaking, tearfulness, disturbed sleep, replaying the incident or uncertainty about whether they did the right thing.
These reactions do not mean that you failed to cope. They can be a normal response to a distressing and unfamiliar event.
Speak to someone you trust and allow yourself time to process what happened. If the experience continues to affect your sleep, work, driving or wellbeing, seek support from your GP or an appropriate professional service. Employees may also have access to occupational-health or employee-assistance support.
Avoid judging your actions with information that only became available later. At the scene, you could work only with what you could see, what you knew and the instructions you received.
Why Practical Training Helps
Reading an article can clarify priorities, but it cannot reproduce the physical and emotional reality of helping another person.
Practical first aid training gives learners time to assess simulated incidents, practise CPR, handle an AED, control bleeding and discover which decisions they find difficult.
It also creates space to ask questions about circumstances that do not fit neatly into a written checklist.
Training does not turn someone into a paramedic, firefighter or collision investigator.
Nor does it authorise a person to enter an unsafe scene. Its value lies in making the first safe actions more familiar: assess danger, call for help, recognise an immediate threat to life and provide appropriate care within the limits of your training.
People who work on the road may have additional reasons to prepare. Driving instructors, taxi and private-hire drivers, delivery teams, fleet drivers and passenger-transport staff spend much of their working day in public environments. Our article about first aid for professional drivers explores the training considerations for those roles.
This article serves a different purpose. It is for anybody who may unexpectedly be the first person to encounter a collision and wants to understand how to help safely.
Real World Examples
A Collision on a Residential Road
A driver finds two cars blocking part of a residential street. Both drivers are conscious, but one complains of neck pain.
The witness stops beyond the collision without obstructing the road, switches on their hazard lights and calls 999. They ask the casualties to remain still, keep other people away from the damaged vehicles and report that both drivers are conscious.
They do not attempt to remove either casualty. Their calm report and reassurance provide useful support while emergency services travel to the scene.
Smoke from an Electric Vehicle
A passer-by sees smoke beginning to emerge from beneath an electric vehicle following a collision. One occupant has already left the car.
The passer-by moves the occupant and other bystanders further away, calls 999 and clearly states that an electric vehicle is involved. They do not approach the battery area, touch exposed components or attempt to extinguish the fire.
In this situation, creating distance and providing accurate information are the most useful forms of assistance.
An Unresponsive Casualty in a Car Park
A person collapses beside a parked vehicle after witnessing a minor collision. They are not one of the drivers and have no obvious traumatic injury.
A bystander checks for a response, calls 999 and reports that the person is not breathing normally. Another person is sent to retrieve the building’s AED. CPR begins on the call handler’s instructions.
Not every medical emergency near a collision is caused by trauma. The priority is what the casualty needs now, not guessing why it happened.
A Collision on a High-Speed Road
A motorist sees a damaged vehicle in a dangerous position on the opposite carriageway. There is no safe place nearby to stop and reaching the vehicle would require crossing live traffic.
The motorist continues to a safe place and calls 999 with the road number, direction of travel and nearest junction. They do not attempt to cross the carriageway.
Continuing past the scene can feel uncomfortable, but avoiding an obviously dangerous approach was the correct decision.
Frequently Asked Questions
Should I always stop when I see a road traffic collision?
No. Stop only when you can do so without creating another hazard. On a motorway or high-speed road, continuing to a place of relative safety and calling 999 may be the safest and most useful response.
What information should I give the 999 operator?
Give the road or location, direction of travel, nearest junction or landmark, number of vehicles, apparent number of casualties and any immediate hazards. Report if someone is trapped, unresponsive, bleeding heavily or having difficulty breathing.
Should I move someone out of a crashed vehicle?
Not unless they are in immediate danger. Unnecessary movement may worsen injuries and expose both of you to additional hazards. Tell the call handler where the casualty is and follow their instructions.
Is an electric vehicle dangerous after every collision?
Not necessarily. Electric vehicles are not automatically more dangerous than petrol or diesel vehicles, but damaged high-voltage systems require specialist handling. Do not touch exposed orange cables or damaged battery components. Move away and call 999 if there is smoke, heat, hissing, popping, sparks or a chemical smell.
Should I try to put out an electric-vehicle fire?
No. Move to a safe distance, keep other people away and call 999. Electric-vehicle battery fires require specialist fire-service management.
Can I use a public defibrillator without training?
Yes. Public-access AEDs provide instructions and analyse the casualty’s heart rhythm. The device will only advise a shock when appropriate. Training is still valuable because it allows you to practise CPR and become familiar with the equipment before an emergency.
Should I remove a motorcyclist’s helmet?
The Highway Code advises that a motorcyclist’s helmet should not be removed unless it is essential and you are trained to do so. Call 999 and follow the instructions provided.
What if I am frightened of doing something wrong?
Start with actions that are always useful: protect yourself, call 999, describe what you can see and follow the call handler’s instructions. You are not expected to diagnose injuries or perform a technical rescue.
A Calm Response Can Still Be a Powerful One
Being first at a road traffic collision does not mean becoming the incident commander.
It means making sensible decisions during the gap before professional help arrives.
Sometimes that will involve CPR, an AED or pressure on a serious wound. At other times, the most valuable action will be identifying the location, keeping people away from traffic or simply reassuring a frightened casualty.
The order matters. Look after your own safety, call for help and then provide the care you can deliver without creating further danger.
DTMK Training Services provides practical workplace first aid courses and community first aid and CPR training from our training centre in Bletchley, Milton Keynes. Private training can also be arranged for driving schools, transport businesses, fleets and other organisations.
If you are unsure which course matches your role or the situations you want to prepare for, contact DTMK Training Services. We can help you compare the available options without assuming that the longest course is automatically the right one.
Sources and Further Information
This article provides general educational information. It does not replace practical training, professional medical advice, instructions from a 999 call handler or directions from the emergency services.
Comments