Looking over the material, I can't find anything definitive.
At least two adults must be present at all Church-sponsored activities attended by youth or
children. To protect youth and children, leaders should always avoid one-on-one situations
with a youth or a child unless the leader and young person are clearly visible to nearby adult
leaders.
Handbook2 13.6.24 wrote:A man and a woman should not travel alone together for Church activities, meetings, or assignments unless they are married to each other or are both single.
Local leaders hold the keys to interpreting the policy. But in light of the above quotes, it wouldn't be unreasonable to extend it to traveling in a car. When dealing with safety, I'd think it prudent to error on the side of caution.
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