This depends on age is it driving in a car or flying .
and does your child have common sence? there are a lot of thing that car very.
I let mine go on a trip at age 16. to see a friand that had moved . I ask her to call me at lest once an hr. I went on to tell her what could happon and what to look for .
even thow she was 16. at the time and she was going to a place where she had not been before . she did wounderfull . I trusted the fact that I did my job . and she had a cell phone. for any reason. I dont know how old your child is but trust your hart and your feeling on this because everyone is not the same.