Driving a Car Without a Passport

I live in Wisconsin so the distance between nowhere land and city isn't a great distance, 40 miles to Milwaukee. I was excited to meet up with my older boyfriend in the city on the weekend. Shortly after leaving the village, I noticed a white car on the side of the road which wouldn't be uncommon for the area except for it being in summer. During winter here, it's always a common courtesy to stop and see if they need help but since it wasn't danger season, I normally wouldn't think twice about it. However, there wasn't an eightish year old boy walking away from the car. We were at least a mile away from civilization behind me, 14 miles to