How does your sitrict policy read regarding employees transporting students in personal vehicles? Some districts prohibit it under any circumstance. What is the school board associations stance in your state on this issue? Go to the National School Boards Association and click on "state associations" (map of US). http://www.nsba.org
In my last district, no one could transport a student unless the car was inspected by a district engineer as safe and you submitted to a DMV report of your driver's record, verified auto insurance, and the parents' signed permission. This applied to very few employees in a very large district. None of the nurses were on the list for such an inspection and none of us were to transport a child for any reason. We did have a similar policy about liability for insurance however it referred to using our personal vehicles to travel to meetings, home visits or for nurses who traveled between schools
during district hours, not for transporting children.
Conversely, in a private boarding school I worked for, it was an expectation to transport students to doctor's & dentist appointments and such.
I did a google search www.google.com using the search term "school employees transporting students in personal vehicles" and had a lot of hits of sample school policies.
I do not have my Schwab and Gelfman legal book home, and I would suggest checking that for this issue. N. Schwab & M. Gelfman (Eds.) Legal issues in school health services: A resource for school nurses, administrators and attorneys. North Branch, MN: Sunrise River Press.
I think you are correct to be cautious and you were prudent to check with your insurance company about using your car for this purpose. What happens in the health office when you are gone? Is transporting part of your job descrption? Are you required to have a car?