Under what conditions can an Arizona driver be pulled over for a suspected DUI?

A driver in Arizona can be pulled over for suspected DUI if there are indications of erratic driving behavior. This is because law enforcement officers are trained to identify signs that may suggest a driver is impaired, such as swerving, speeding, suddenly braking, or other unusual driving patterns. Erratic behavior raises suspicion that the driver may be under the influence of alcohol or drugs, which justifies initiating a traffic stop to assess the driver's condition further.

While ignoring traffic signals, driving in a designated bike lane, or having a broken taillight can lead to traffic stops for other violations, these issues do not specifically indicate potential impairment. The focus on erratic driving behavior directly correlates with behaviors often associated with driving under the influence, making it a more pertinent reason for a DUI-related stop.