When is it illegal to drive alone in your vehicle?

Driving alone in your vehicle is illegal when the driver is unlicensed because operating a vehicle requires a valid driver's license, which demonstrates that a person has met the necessary requirements and is legally permitted to drive. Without a license, a driver lacks the legal authority to operate a vehicle on public roads, which can lead to penalties, including fines and possible legal repercussions.

In contrast, driving with no passengers, during night hours, or in a registered but uninsured vehicle does not inherently make it illegal. Each of those scenarios may come with its own set of regulations or considerations, but they do not violate the fundamental requirement of holding a valid driver's license.