Which of the following can be a sign of impaired driving character?

Drifting out of lanes can indeed be a significant sign of impaired driving. When a driver is unable to maintain their lane position, it may indicate a lack of control or focus, which can be caused by various factors, including the influence of alcohol or drugs. Impairment can affect a person's reaction times, judgment, and ability to perform complex tasks, such as steering and maintaining a steady course on the road. Therefore, erratic lane changes or drifting are often observed behaviors in impaired drivers and serve as warning signs for law enforcement and other drivers regarding potential danger on the road.

In contrast, driving at the speed limit, using turn signals carefully, and driving cautiously generally signify responsible driving behavior and awareness of traffic laws, which are characteristics of an alert and unimpaired driver. These behaviors do not indicate impairment and instead reflect adherence to safe driving practices.