A child of what age may not be carried in a rear-facing child seat on the front seat of a motor vehicle if the front airbag is active?

Explanation

The rules strictly forbid carrying a child in a rear-facing seat on the front passenger seat while the airbag is active. In a crash the airbag deploys with huge force, slams into the seat, and would fatally or very seriously injure the child. This ban applies regardless of the child's age.