ABSTRACT: A passenger safety curriculum was developed and implemented for expectant mothers and coaches attending Lamaze childbirth classes at a prepaid health plan. Women in the minimal and moderate intervention groups increased their safety belt use from 19.4 to 28.6% and 13.5 to 24.2%, respectively. Women in the control group and all the husbands or coaches did not show an increase. As adult mandatory safety belt legislation is enacted, additional efforts to promote safety belt use in adult family members are needed.