What is the proper procedure for using arm signals by the driver?

The proper procedure for using arm signals as a driver emphasizes the need for clear communication with other road users. Ideally, when signaling, a driver should be able to maintain effective communication while controlling the vehicle. This makes ensuring that the driver side window operates correctly as critical for the effectiveness of hand signals. If the window is functioning properly, the driver can extend their arm out the window to signal turns or lane changes.

In contexts where drivers might use arm signals, such as riding bicycles or in vehicles where their signaling lights may not be functioning, it is even more crucial for those signals to be visible and understood by others on the road. Thus, ensuring that the driver can signal from the window is a necessary part of safe vehicle operation.

While other choices propose either not using hand signals or imply distractions from safe driving (like viewing signals in rear-view mirrors or needing to keep both hands on the wheel all the time), the focus should remain on the effective and clear communication that arm signals provide in situations where electronic signals may not be adequate or available.