Which driving symptom might indicate that a driver is impaired and their actions unpredictable?

Driving symptoms that would indicate that a driver is impaired and their actions is unpredictable when they don't follow the rules in terms of driving, they drive in an inconsistent way and they tend to weave from side to side. If this happens, then it means that the driver of the vehicle must have been experiencing something or is impaired. In responding to situations like this, it is best to ask for assistance.