When pulling out from a bus bay, you should?

When pulling out from a bus bay, using your left turn signal and proceeding with caution is essential for ensuring the safety of both yourself and other road users. Activating your left turn signal communicates your intention to other drivers, alerting them that you plan to merge back into the traffic flow. This is particularly important when coming from a location like a bus bay, where visibility may be limited due to potential obstructions.

Caution is equally crucial because the traffic conditions may change rapidly, and you need to be aware of approaching vehicles, cyclists, and pedestrians. Proper use of signals combined with caution helps prevent accidents and keep the roadway safer for everyone.

The other options do not prioritize communication and safety in the same manner. Ignoring signaling can lead to confusion among other drivers, while sounding the horn can be inappropriate and might not convey your intent effectively. Also, while yielding to all traffic is important, signaling your intentions properly gives you the opportunity to safely merge when it's clear, rather than waiting unnecessarily.