If you’ve been researching car seats, you may have come across the Swedish Plus Test. It’s often described as one of the toughest crash tests in the world, focusing specifically on the safety of rear facing car seats for children. But what does it mean for parents choosing a car seat in the UK?
In this article, we explain what the Swedish Plus Test is, why it exists, and how it compares to UK car seat regulations and the safety standards Silver Cross designs to.
What is the Swedish Plus Test?
The Swedish Plus Test is a voluntary car seat safety test launched by Sweden’s National Road and Transport Research Institute in 2007.
Unlike European regulations, which all car seats must meet to be legally sold, the Plus Test is voluntary. Only manufacturers of rear facing toddler car seats can choose to apply
The test is designed specifically to assess how well a car seat protects a child in a severe frontal collision - the type of crash most likely to cause serious injury to the head and neck. Because of its strict criteria, only rear facing car seats are eligible to take part.
Why is Swedish Plus testing so rigorous?
The Swedish Plus Test is widely regarded as one of the most demanding car seat tests in the world because it focuses on one critical area of child safety: neck protection.
Babies and young children have relatively large, heavy heads and their necks are still developing. In a high-impact frontal collision, the forces placed on the neck can be severe. The Plus Test sets very low tolerance limits for these forces, with the aim that no child should be exposed to potentially life-threatening neck loads.
To achieve this, the test uses:
- A more severe frontal crash scenario than standard regulations
- A very short stopping distance, increasing crash forces
- Direct measurement of neck loads, which many other tests do not prioritise
This combination makes the test extremely difficult to pass - by design.
Why only rear facing car seats pass the Swedish Plus Test
The Swedish Plus Test is closely linked to Sweden’s longstanding approach to child car safety, where rear facing travel is encouraged for as long as possible.
In a frontal collision, a rear facing seat supports the child’s head, neck and spine together, allowing crash forces to be spread across the back of the seat. This reduces the strain placed on the neck, which is why rear facing designs perform so strongly in Plus Test conditions.
The test is reserved exclusively for rear facing toddler seats, with those offering forward facing unable to be tested – for example, Motion 2 cannot be submitted to the Swedish Plus Test, as it offers both rear and forward facing travel for toddlers. Reinforcing the widely accepted view that rear facing travel offers the highest level of protection for young children.
Rear facing car seats are a legal requirement in the UK for children up to the age of 15 months. However, as proven with industry testing (including the Plus Test), extended rear facing car seats allow children to benefit from rear facing protection well beyond the legal minimum, often up to 4-7 years old. Learn more about the benefits of extended rear facing travel.
What is the difference between R129 (i-Size) and the Swedish Plus Test?
It’s important to understand how the Swedish Plus Test fits alongside existing UK and European regulations.
R129 (i-Size) is the mandatory safety regulation that all new car seats must meet to be legally sold in the UK. It covers multiple crash scenarios, including frontal and side impacts, and sets minimum safety standards that ensure seats are safe and compliant.
The Swedish Plus Test, by contrast, is:
- Voluntary
- Focused only on severe frontal collision
- Designed to assess neck protection in extreme conditions
R129 approval means a car seat is safe and legal to use. The Plus Test goes a step further, offering additional reassurance for parents who want it.
Is the Swedish Plus Test required in the UK?
No. UK law requires car seats to meet R129 (i-Size) or existing approved standards. The Plus Test is optional and offers extra reassurance rather than legal compliance.
What does the Swedish Plus Test mean for parents?
A Plus Tested seat shows that a manufacturer has chosen to test a rear facing only design against some of the toughest conditions possible. That can offer reassurance, particularly for families planning to rear-face for longer.
However, it’s equally important to remember that:
- UK-approved car seats meeting R129 (i-Size) standards are safe
- Proper fit, correct installation and everyday usability matter just as much
The safest car seat is always one that is used correctly, every journey.
How the Swedish Plus Test fits alongside Silver Cross safety standards
The Swedish Plus Test is a respected independent assessment focused on severe frontal impacts in rear facing toddler seats.
The Perform car seat - our first extended rear facing seat designed for children up to seven years old - is Swedish Plus Tested, offering that extra level of reassurance for parents.
All Silver Cross car seats meet the latest R129 (i-Size) standards and undergo extensive internal and third-party testing. This includes frontal, side and rear impact performance, durability testing and everyday usability assessments, providing a full picture of the car seat’s safety.
Interested in learning more? See our guide on how we test Silver Cross car seats.
Travel safely and confidently with Silver Cross
When you’re ready, explore the Silver Cross car seat collection to find the right model for you, including the Swedish Plus-tested Perform, or other rear facing options that grow with your child like Motion 3 All Size 360 and Approach Plus 360.
For more expert advice, fitting support and vehicle compatibility checks, visit the Silver Cross Car Safety Hub.
