What is a common reason for a police officer to initiate a DUI stop?

A police officer is likely to initiate a DUI stop when they observe erratic driving behaviors, as this can indicate that the driver may be impaired. Erratic behaviors can include weaving between lanes, sudden changes in speed, or running red lights, all of which suggest that the driver is not fully in control of their vehicle. Such observations raise a concern for road safety and serve as a reasonable basis for law enforcement to pull a driver over for further evaluation.

Other reasons, such as not wearing a seatbelt or driving within the speed limit, do not typically provide sufficient cause for a DUI stop, as they do not directly indicate impairment. Furthermore, having a passenger in the vehicle is a normal situation and does not point to any signs of DUI. Therefore, erratic driving behaviors are the most common and justifiable grounds for initiating a DUI stop.