Which one of the following is NOT a part of a safe lane change?

Signaling and turning is not specifically a part of the safe lane change process. A safe lane change primarily involves several key actions aimed at ensuring that the maneuver does not endanger the driver or other road users.

For instance, yielding to merging traffic is crucial as it ensures you do not cut off another vehicle, which could lead to accidents. Checking your mirrors informs you of any vehicles approaching from behind or sitting in adjacent lanes, providing a clearer understanding of your surroundings. Looking over your shoulder is also necessary because it offers a direct view of potential blind spots, allowing the driver to ensure that no vehicle is in that space before changing lanes.

In contrast, while signaling is important in general driving for communicating intentions to other road users, the focus during a lane change is particularly on assessing safety through checking mirrors and blind spots rather than the act of turning itself. Thus, the reference specifically to "signaling and turning" makes it the least fitting choice in the context of a safe lane change.