How should you signal a left turn?

Signaling a left turn is essential for ensuring the safety of all road users, and the correct technique involves extending your left arm straight out the window. This hand signal is widely recognized and communicates clearly to other drivers that you intend to make a left turn.

Using your left arm straight out is part of hand signaling conventions which help maintain clarity in communication between drivers when electronic turn signals may not be visible, such as in certain conditions. Moreover, it aligns with the standard driving practices that are taught for signaling turns, thus ensuring consistency on the road for all drivers.

The other options may not provide the correct indication for a left turn or are not effective in all circumstances. For instance, raising your left arm at a 90-degree angle actually indicates a right turn, while extending your right arm straight out the window is particularly recognized as signaling a left turn in specific contexts and can lead to confusion. Using your turn signal while keeping your hands on the wheel, while a good practice for safety, does not effectively convey intentions to others unless they are directly observing your vehicle's signals.