The California Department of Transportation (Caltrans) is primarily responsible for designing, building and maintaining the state's highway system. For information about child car seats, contact the Department of Motor Vehicles. Legislation requires (operative on January 1, 2002) that children be in a car seat (age appropriate) until the child is 6 years of age or weighs 60 pounds or more. You can check with the Department of Motor Vehicles for clear language and laws on child passenger restraint systems at this address:

http://www.dmv.ca.gov/pubs/vctop/d12/vc27360.htm