Links to ATV safety-related information...
COHV / CVHR (Canadian Off-Highway Distributors' Council) has several interactive safety displays, including this one:
Don't Blame Jake Good information on suitable sizes of vehicles for kids (Hint: Once the Flash animation loads, point your mouse at various objects in the picture. If an object moves or makes a noise, click on it.)
And, the COHV has also allowed us to present:
Adventure Trail Interactive animations and games, stressing safety clothing as well as other smart trail habits
Tips for trail riding with children (also courtesy of the COHV)