What height must a child be at to wear an adult seatbelt without a booster seat?

In Scotland, the legal requirement for a child to use an adult seatbelt without a booster seat is that the child must be at least 135 cm tall. This regulation is in place to ensure the safety of children while traveling in vehicles. At this height, the adult seatbelt is generally able to fit properly across the child's body, providing adequate protection in the event of a collision.

Height regulations are implemented based on research that indicates how seatbelt positioning can affect injury outcomes during accidents. Below this height, children are at a greater risk of injury because the seatbelt may not sit properly across their lap and shoulder, which can lead to serious injuries in a crash.

While taller heights, such as 140 cm or more, may be referenced for different regulations or recommendations, the specific legal threshold for transitioning from a booster seat to an adult seatbelt is explicitly set at 135 cm in Scotland. This is crucial information for ensuring compliance with safety legislation and protecting young passengers in vehicles.