What is Cruise Control used for?

Cruise control is designed specifically to maintain a steady speed of a vehicle without the need for continuous foot pressure on the accelerator pedal. This feature is particularly useful during long drives on highways, where maintaining a consistent speed can enhance fuel efficiency and reduce driver fatigue. By setting the desired speed, drivers can relax their leg muscles while still adhering to traffic laws, as the cruise control will take over the acceleration, allowing them to focus more on steering and other driving tasks.

This functionality contrasts with the other choices, which do not accurately describe the purpose of cruise control. For example, while automatic steering might suggest more advanced automotive technologies, cruise control does not involve steering the vehicle. Similarly, cruise control does not serve as a safety feature that applies brakes in emergencies, nor does it control air conditioning. Each of these other functions falls outside the specific capabilities of cruise control, further underscoring choice B as the correct answer.