Rear windows do not go all the way down in most modern vehicles. In fact, most rear windows only open a few inches. This is because of safety concerns. If a rear window could be opened all the way down, it would create a large opening that could allow passengers or objects to fall out of the vehicle. Additionally, an open rear window could allow exhaust fumes or other harmful substances to enter the cabin of the vehicle.
There are a few exceptions to this rule. Some older vehicles, such as classic cars, may have rear windows that can be opened all the way down. Additionally, some commercial vehicles, such as vans and pickup trucks, may also have rear windows that can be opened all the way down. However, these are exceptions to the rule, and in most modern vehicles, the rear windows only open a few inches.
