A white cloth, towel, handkerchief, or rag hanging from a car window is not an official road sign, but in many places it is an informal signal that the vehicle is having trouble and the driver intends to return.
Common meanings include:
Vehicle breakdown — the car has mechanical problems and is temporarily abandoned.
Waiting for assistance — the driver has gone to get help, fuel, or a tow truck.
“Do not tow or ticket immediately” — in some regions, motorists and authorities recognize the cloth as indicating the owner is aware of the situation.
The exact meaning varies by country and local custom:
In parts of the United States, especially in the South, a white cloth often means a disabled vehicle whose owner plans to come back soon.
In some other countries, it may simply be a general distress signal or have no widely recognized meaning at all.
If you see one, the safest assumption is: the vehicle is disabled and assistance is being arranged. It does not give the vehicle any special legal status, and local laws about parking, stopping, or towing still apply.
If you tell me where you saw it (country or region), I can explain the local convention more specifically.
