a suitable child restraint is available
It is your responsibility as a driver to ensure that children are secure and safe in your vehicle. Make sure you are familiar with the rules. In a few very exceptional cases when a child restraint is not available, an adult seat belt MUST be used. Child restraints and seat belts save lives!
B they sit between two belted people
C they can fasten their own seat belt
D they can see clearly out of the front window