What is the policy for nighttime driving for 18-year-olds?

For an 18-year-old driver in Utah, the policy regarding nighttime driving does not impose any restrictions on the time they can drive. This means they are permitted to drive at any hour of the day or night without needing to adhere to a specific cutoff time. However, the requirement is that a licensed driver who is at least 21 years old must be seated in the front passenger seat during the drive. This policy ensures that young drivers can have guidance from an experienced driver while they gain more experience on the road.

The other options suggest limitations that do not apply to 18-year-old drivers in Utah, which is why they are not the correct answers. For instance, setting a specific curfew or banning nighttime driving entirely does not align with the regulations for those who are 18 or older. Thus, the focus is on the presence of an adult supervisor rather than restricting their driving hours.