What is necessary to do before making a right turn at a corner?

Before making a right turn at a corner, it is essential to ensure the path is clear and safe for all road users. Merging into the bicycle lane before turning is necessary because in many jurisdictions, including New Mexico, the bike lane is typically on the right side of the roadway. This allows you to position your vehicle safely without cutting off any cyclists who may be in the bike lane.

By checking for bicycles and potentially merging into the bike lane when it is clear, you minimize the risk of a collision and demonstrate good awareness of surrounding traffic, including cyclists and pedestrians. This practice helps ensure a smoother and safer transition into the turn.

The other choices do not adequately address the requirements for safely executing a right turn. Relying solely on signaling without looking, only checking mirrors, or trying to turn from the left lane would all increase the risk of accidents, as they do not ensure the turn is done in consideration of all surrounding road users.