What is a potential issue when using only the left sensor for tracking?

Using only the left sensor for tracking can hinder the robot's ability to effectively respond to right turns. When the robot relies solely on one sensor, it captures only the information from that side of the environment. As a result, it may not detect changes or features in the area to its right, leading to issues in navigating turns or curves that deviate from the left side.

In the context of line following, when encountering a right turn, the robot may struggle to adjust its path appropriately because it lacks the necessary feedback from the right sensor. This limitation can result in overshooting the turn or failing to follow the intended path, as the robot is not adequately informed about the positions or changes on the right side. Therefore, utilizing only one sensor sacrifices the ability to maintain balance and accuracy while navigating, especially during actions like right turns.