What does this mean and how to behave?

So i am a guy and something been happening with me since last month a 3 girls from some town come everyday to my town because they have a friend in nh town this friend i dont even know her name!!! So i dont know any of those girls

so the first time they see me they stare and started to drive fast when they met me !!! Today i was in my car and they passed infront of me and they male sounds like if they are doing sex !! What that mean amd how shiukd i behave because many times i ignore them
What does this mean and how to behave?
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