When can a child stop using a car safety seat?

According to Finnish road traffic law:

• Children under 135 cm (4 ft 5 in) must use an approved child restraint system that is suitable for their height and weight (such as an infant seat, child seat, or booster seat).
• Children under 3 years old must never travel in a car without a child restraint system.
• Once a child is over 135 cm tall, they may use the vehicle’s regular seat belt.

However, the Finnish Road Safety Council (Liikenneturva) recommends that children use a booster seat until they are about 150 cm tall, so that the seat belt fits properly across the body.

After that, both children and adults should use the vehicle’s seat belts.