Here are some resources that you might find helpful:
SRTS Middle School Curriculum: Why it is Important and How to Make an Impact.
This webinar covers the benefits of reaching out to middle school-aged children, and examples of SRTS programs that have successfully engaged middle school students.
The National Center also has a tip-sheet for Engaging Middle School students in SRTS programs. This resource provides five illustrated examples of ways to approach, interact with, and fully engage middle schoolers in activities pertaining to school travel.
Resources developed by other organizations include:
The Pedestrian and Bicycle Information Center's Page for Educating Children and Teens offers multiple resources aimed at promoting bike and pedestrian safety education for youth.
The following resources were developed by the Office of Healthy Schools, a division of the Mississippi Department of Education: