What to Do After a Car Accident: The Details That Protect You Later

A junction, a moment's hesitation, a dull thud. Nobody's hurt, thankfully. The other driver gets out, already apologising, or already blaming you, and within a minute you're standing on the pavement with your phone in one hand and your heart going far too fast.

Those next ten minutes shape almost everything that follows: how quickly your insurer settles, who gets held responsible, whether a dispute drags on for months. And they happen at exactly the moment you're least equipped to think clearly.

This guide walks through what to do at the scene, which details genuinely matter, the mistakes that cost people later, and how objective data from the car itself can stop your claim becoming one person's word against another's.

A quick note. The legal points in this article are general information for drivers in the UK, correct at the time of publication. For your specific situation, always check with your insurer, your policy documents or a qualified professional.

Step one: stop, and make it safe

In the UK, if you're involved in a collision that causes damage or injury to another person, vehicle, animal or property, the law requires you to stop. Not "pull over a few streets later", stop at the scene, for a reasonable amount of time.

Then make the situation safe:

• Hazard lights on. If the cars are blocking a live lane and can be moved safely, move them, but photograph their positions first if you can do so without putting anyone at risk.
• Get everyone out of harm's way. On a motorway or fast road, that means behind the barrier, not standing next to the cars.
• Check for injuries. If anyone is hurt, even slightly, call 999. Everything else in this article comes second.

Step two: exchange the right details

The legal minimum is that you give your name, address and vehicle registration to anyone with reasonable grounds to ask for them. In practice, you'll want more than that from the other driver:

• Full name, address and phone number
• Vehicle registration, make, model and colour
• Insurance company and, ideally, policy number
• Whether they are the registered keeper, and if not, who is

If injuries are involved, you also need to produce your insurance certificate. If for any reason you can't exchange details at the scene, the other party isn't present, or refuses, you must report the collision to the police as soon as reasonably practicable and in any case within 24 hours. Check with your local force how they accept these reports; traditionally it's done in person.

Step three: gather evidence before it disappears

Accident evidence has a very short shelf life. Within half an hour the cars are moved, the witnesses have gone home and the light has changed. Capture what you can while it's there.

Photographs. Take wide shots first, showing where the vehicles ended up relative to the road, junction, lane markings and signs. Then the damage on both cars, the number plates, and anything relevant around you: traffic lights, a hidden give-way line, a parked van blocking the view, road surface conditions. One wide photo showing the layout is worth ten close-ups of a dented bumper.

Witnesses. If anyone saw it happen, get their name and phone number straight away. People who were happy to help at the scene become much harder to find a week later.

Your own notes. Open the notes app and write down, while it's fresh: the exact time, the exact location, the direction each car was travelling, the weather, and what was said. Memory after a collision is notoriously unreliable, adrenaline compresses time and fills gaps with assumptions.

Dashcam footage. If you have a dashcam, save the clip before it gets overwritten.

Driving abroad: the European Accident Statement

If you have a collision while driving in continental Europe, the other driver may produce a standard two-column form, the European Accident Statement (in Italy it's called the CAI, the constatazione amichevole). Each driver fills in their own column, ticks the boxes that describe their manoeuvre, draws a sketch and signs.

It's a genuinely useful document, but treat it carefully:

• Only tick the boxes that describe what your vehicle was doing. Not what you think the other driver did.
• Write the number of boxes you've ticked in the space provided, so nothing can be added later.
• Don't sign anything you don't understand or don't agree with. If the form is in a language you can't read, use the observations box to say so. You're not obliged to sign a joint version of events you dispute.
• Keep your copy. The form is carbonless and duplicated precisely so that each driver has one.

In some countries, a statement signed by both drivers is presumed to reflect what happened unless the insurer can prove otherwise. That's great when it's accurate and a serious problem when it isn't.

The mistakes that cost the most

Admitting fault at the scene. "Sorry, I didn't see you" is a natural, polite thing to say. It's also, potentially, an admission. Be courteous, check the other person is OK, but describe facts rather than blame. Leave liability to the insurers.

Agreeing to "sort it out privately". It can seem simpler to pay cash and keep it off the insurance. Sometimes it works. Often, damage turns out to be more expensive than it looked, or an injury claim appears weeks later, and your insurer may take a dim view of not being told. Most policies require you to report any accident promptly, even if you don't intend to claim.

Skipping photos because "it's only a scratch". The scratch you can see is not necessarily the damage there is. Modern bumpers hide sensors and brackets that can turn a minor scrape into a significant repair.

Relying on memory for the timeline. Ask ten people how fast they were going at the moment of impact and you'll get ten confident, slightly wrong answers.

Reporting late. Insurers expect to hear about an incident quickly. Check your policy for the deadline and don't leave it until you've "had time to think".

The next 48 hours

The scene is only the first part. A few things are worth doing once you're home and the adrenaline has worn off.

Get checked if anything feels wrong. Neck and back pain after a collision often doesn't show up for a day or two. If something aches, see your GP or call NHS 111, both for your health and because a record made close to the event is far more useful than one made weeks later.

Call your insurer, not a stranger. After a collision, some drivers are contacted by firms offering to "handle everything", replacement cars or quick compensation. Before agreeing to anything, speak to your own insurer and read what you're signing.

Keep a simple file. Photos, the other driver's details, witness numbers, your notes, any receipts for taxis or hire cars, and every reference number you're given. It takes five minutes to set up and saves hours of searching later.

Don't repair before the insurer has seen the damage, unless they've told you to go ahead.

The real problem: two versions of ten seconds

Here's the uncomfortable truth about most disputed collisions. Both drivers usually believe their own account. Both remember the light being amber, not red; both are sure they were going slower than they actually were; both are certain they'd stopped completely.

When there's no independent witness and no camera, the claim comes down to two incompatible memories of the same ten seconds. Insurers then fall back on general rules, who was turning, who was going straight, who hit whom from behind, that may or may not match what actually happened.

What's missing in nearly every case is something simple: objective data about the impact itself.

Data as evidence: what an in-car device adds

This is where the car's own data changes the conversation. Greenbox Guardian AI is a plug-and-play device that connects to your car's OBD-II port, and one of its core functions is crash analysis. When a collision happens, it detects the event immediately and produces an automatic report with objective data about the impact:

• speed at the moment of impact;
• G-force of the collision;
• direction of the impact;
• precise time;
• GPS position.

The report also includes an AI analysis of the crash dynamics, and it's designed to be shared with your own insurer as documentation supporting your account of what happened. It doesn't replace the insurer's judgement or the forms you'd normally complete, it sits alongside them, with evidence that doesn't depend on anyone's memory.

Think about what that means in practice. If the other driver claims you were pulling out and you say you were stationary, a recorded speed of zero at the moment of impact is a very different argument from "I'm sure I'd stopped". If there's a disagreement about the time or the exact location, the timestamp and GPS coordinates settle it.

Around the crash report sits the context of the whole journey: full trip history and the Virtual Dashboard Live, which lets you tap any point of a trip and see the real parameters recorded at that moment. High-definition tracking logs your position every 200 metres, every minute and at every turn of 30° or more, using four satellite constellations (GPS, GLONASS, Galileo and BeiDou), which matters at exactly the kind of built-up urban junction where a basic GPS loses accuracy.

If you'd like to see what a real report looks like, we took one apart section by section in Inside a Real Crash Report.

The glovebox checklist

Save this on your phone or print it and keep it with your insurance documents:

1. Stop. It's a legal requirement if there's damage or injury.
2. Make it safe: hazards on, people out of harm's way. Anyone hurt? Call 999.
3. Photograph vehicle positions, damage, number plates and surroundings, wide shots first.
4. Exchange details: name, address, registration, insurer. Get the other driver's phone number too.
5. Witnesses: names and numbers, straight away.
6. Write down the exact time, location, directions of travel and weather.
7. Don't admit fault. Stick to facts.
8. Couldn't exchange details? Report to the police within 24 hours.
9. Abroad? On the European Accident Statement, tick only your own boxes, count them, and don't sign what you dispute.
10. Tell your insurer promptly, even if you don't plan to claim.

In short

Most of what decides a claim happens before you even leave the scene. Stay safe, collect evidence while it still exists, describe facts rather than apologise, and don't let anyone rush you into signing a version of events you don't agree with.

And if you can, make sure that on the day it happens, your memory isn't the only witness. Investing in a device that records speed, impact force, direction, time and location won't prevent the accident, but it means you won't have to argue about it with nothing but your word.

Discover Guardian AI: mobisat.com/greenbox-guardian.html