system
Given the following post, respond as if you're commenting on Reddit:
human
[ELI5] what does it mean when an abandoned car on the highway has a white bag or object hanging out from the window?
gpt
There are certain laws pertaining to cars left on the side of the road. After a certain amount of time the car is considered abandoned and will be towed off the road.

A white object (like a shirt or towel) is the the sign that you will be returning to the car and are not just abandoning it.