When is it illegal to drive in Arizona?

Driving in Arizona is illegal when an individual is impaired by drugs or alcohol or lacks a valid driver's license. The law specifically aims to maintain road safety by prohibiting individuals who cannot operate a vehicle responsibly from doing so. Driving under the influence of drugs or alcohol significantly increases the risk of accidents, endangering the driver, passengers, and others on the road. Furthermore, not having a valid driver's license indicates that an individual has not met the necessary requirements to operate a vehicle legally, which further underscores the importance of being licensed for public safety.

The other scenarios, such as driving in inclement weather, while potentially dangerous, do not constitute a legal prohibition against driving. Similarly, exceeding the speed limit may result in a traffic violation but does not make driving illegal; instead, it may lead to fines or points on a driver’s license. Lastly, driving an unregistered vehicle is also against the law but typically falls under civil violations rather than outright illegality in the same sense as impaired driving or unlicensed operation. Thus, the conditions mentioned in the answer are the most significant in determining when driving is prohibited in Arizona.