What is a “safety seat”:

1. A seat meeting specified standards installed on two-wheelers and designed for transporting children.
2. Correct answer: A seat, meeting specified standards, secured to the vehicle with a safety belt and used for transporting children with independent belts.
3. Any seat that is adjusted for driving children and elderly people and meets the standard which was set by the Ministry of Environmental Protection
4. A seat which is installed inside a vehicle during its manufacture-stage and is adjusted for driving children with a maximum age of 14 years

WhyA child car seat is a special seat for carrying children, secured in the car with the safety belts. The question has nothing to do with bicycles or built-in factory seats.