Why should a driver open the window briefly when stopping at a railroad crossing, where practical, in addition to looking both ways?

Pick an answer

1. Opening the window has no bearing on detecting an approaching train
2. It is done only to allow fresh air into the vehicle, unrelated to safety, since most cabins already have working ventilation systems
3. It can help the driver hear an approaching train's horn or warning bells that might not be immediately visible
4. This practice is required only at crossings without any warning signals

Correct!

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