Who is at fault in lane changes and sideswipe accidents?

What is meant by lane change and sideswipe?

Lane change refers to moving from one driving lane to another in the same direction of travel, for instance while overtaking, merging onto a highway, or when your lane ends. Sideswipe is a collision where cars hit each other from the side—often occurring when one or both vehicles are moving sideways between lanes.

The main rule: The one changing lanes must ensure safety

The starting point in Norwegian traffic law is straightforward: The person changing lanes has a special responsibility to ensure that the maneuver can be carried out safely without posing a risk or hindrance to others. This is stipulated by traffic regulations, which require diligence and that positioning/changing lanes must happen safely. In practice, this means that if you change lanes and collide with a car that is already in the lane you are entering, you will often be held liable.

You can read the traffic regulations in full at Lovdata (Regulations on Motorized and Pedestrian Traffic).

When can liability be shared (or fall on "the other")?

Even though the main rule is strict for the person changing lanes, there are situations where fault/liability can be shared or, in some cases, placed on the other party. Some typical "gray areas":

• Both change lanes simultaneously: If two cars simultaneously move into the same "gap" and sideswipe each other, insurance companies may assess shared liability when it's difficult to determine who initiated the maneuver or who had a clearer overview.
• The other party accelerates or "deliberately blocks": If it can be demonstrated that a car deliberately hinders merging or makes an unexpected acceleration while you are already about to merge, the assessment may be nuanced. Here, documentation (video/witnesses) is often crucial.
• Unclear lane markings, roadwork, or temporary signage: When lane arrangements are unclear, shared liability is more frequent as both should have adjusted to the conditions and exercised extra diligence.
• You are "forced out": If a car comes into your lane and you can't avoid a sideswipe without colliding, the liability may lie with the car that actually left its lane.

Note: Insurance companies always make a concrete overall assessment. Terms and practices may vary, and particularly in cases of doubt, liability may end up being shared.

The details that often determine in a sideswipe

In many cases, both parties are certain they were "already in their lane first." Then small details become important:

• Impact point and "scratches": The damage may indicate who moved sideways (e.g., longitudinal scratch from front corner to back door).
• Position on the road: Were you fully in your lane, or were you "hanging" on the line?
• Turn signals and mirror/shoulder checks: Turn signals alone do not grant right of way; you must still ensure safety.
• Speed and traffic flow: Large deviations can influence the assessment, especially if they make the situation unpredictable.
• Witnesses or dashcam: Independent witnesses often carry significant weight. Dashcam footage can be very useful when the sequence of events is disputed.

What to do right after a sideswipe?

1) Secure the scene and check for injuries

Stop in a safe place, activate hazard lights, and place out a warning triangle when necessary. If anyone is injured, call 113. In dangerous situations or if traffic direction is needed, the police can be contacted.

The police have advice on what you should do in the event of a traffic accident here: Police – traffic accident.

2) Document before moving the cars (if it’s safe)

• Take pictures of the cars from multiple angles, including position in the driving lane, road markings, signs, and any obstacles.
• Take close-up pictures of damage, paint marks, and plastic debris.
• Note the time, weather/road conditions, and names/numbers of witnesses.

How to fill out the damage report when you disagree

It is perfectly normal to disagree at the scene. A good tip is to separate facts from evaluations:

• Agreement on facts: where, when, weather, direction, which lanes, visible damages.
• Disagreement on fault: briefly and precisely describe each party’s version, without arguing.

With Skademeldinger.no, you can fill out the damage report together on your mobile, create a single shared version with both parties' information, and sign digitally. This also makes it easier to share relevant documentation (pictures, witness info) and submit it complete to the insurance company—especially useful in lane change cases where details matter significantly.

Economics: deductible, bonus, and liability

How this plays out financially depends on the distribution of liability and what type of coverage you have:

• If you are held liable, the damage typically falls on your liability insurance (damage to the other party). Damage to your own car is only covered if you have partial comprehensive/comprehensive insurance, with an agreed deductible.
• In cases of shared liability, both parties may have partial liability, which can affect the bonus and deductible on each side, depending on the company's terms.
• Bonus loss and any rental car/workshop arrangements follow the company's terms and can vary significantly.

Feel free to ask your insurance company for a written explanation of the assessment if you believe the liability is incorrectly assigned.

Practical tips for avoiding sideswipe during lane changes

• Always check your blind spot – blind zones are common in such incidents.
• Change one lane at a time when multiple lanes are present.
• Adjust your speed to the flow of traffic before you start moving sideways.
• Be clear early with turn signals, but don’t expect that a signal gives you the "right" to merge.

In summary

In lane changes and sideswipe accidents, the main rule is that the one changing lanes is responsible, but the outcome may be shared or different when both change simultaneously, the lane setup is unclear, or the other party's driving behavior contributes significantly. The better you document and record facts in the damage report, the easier the assessment will be for the insurance companies. Skademeldinger.no helps you with joint filling, digital signing, and tidy submissions—particularly valuable when it is word against word.