Under what conditions is it illegal to drive in Nevada?

Driving in Nevada is illegal when a driver is impaired by drugs or alcohol, or operating a vehicle without a valid driver's license. This is primarily because impairment significantly affects a person's ability to operate a vehicle safely, greatly increasing the risk of accidents, injuries, and fatalities on the road. Laws are specifically designed to maintain the safety of all road users, and driving under the influence (DUI) is a serious offense that can lead to severe legal consequences.

Additionally, operating a vehicle without a valid driver's license is also illegal as it indicates that the driver has not met the necessary qualifications and requirements to drive safely on public roads, which includes lacking proper knowledge of traffic laws and regulations.

While other conditions mentioned, like being tired or drowsy or having a flat tire, can certainly impair driving safety, they do not automatically constitute illegal driving under Nevada's statutory laws. Similarly, driving at night is not illegal, provided the driver adheres to all traffic laws and safety practices.