What specific driving restriction applies to 15-year-olds in Utah?

In Utah, a specific driving restriction that applies to 15-year-olds is that they cannot drive alone. This is part of the graduated licensing system designed to ensure that young, inexperienced drivers gain necessary skills and experience before they can operate a vehicle by themselves. Typically, a learner's permit allows a young driver to practice driving only when accompanied by a licensed adult who is at least 21 years old. This requirement helps to enhance safety for both the young driver and others on the road by providing a more experienced driver in the vehicle to supervise and guide.

The other options do not accurately reflect the restrictions in place for 15-year-olds, as they are meant to reinforce the importance of safety and skill development for new drivers in Utah.