Which of the following might be a sign of a DWI violation during a vehicle stop?

A sudden stop can indeed be a sign of a DWI violation during a vehicle stop. This behavior may indicate that the driver is reacting unusually or erratically, possibly due to impaired judgment or control, which are common indicators of driving while intoxicated. A driver may abruptly stop to avoid a potential hazard, but if this behavior is observed in combination with other driving characteristics, it can raise red flags about their sobriety.

On the other hand, behaviors such as driving within the speed limit, using turn signals appropriately, and maintaining an uninterrupted lane position typically demonstrate safe driving practices. These actions suggest that the driver is in control and adhering to the rules of the road, which are not indicative of impairment. Therefore, those choices do not generally align with signs of a DWI violation.