What behavior is a typical sign of a driver who is drinking and driving?

The behavior that is a typical sign of a driver who is drinking and driving is the failure to use turn signals. This behavior indicates a lack of attention or control, which is often observed in intoxicated drivers. When a driver is impaired, their ability to perform simple tasks such as signaling turns or lane changes can be negatively affected, leading to unsafe driving behaviors. The use of turn signals is essential for communicating intentions to other road users and ensuring safety on the road, so neglecting to signal can be particularly telling of impaired judgment.

In contrast, frequent lane changes, excessive acceleration, and inconsistent braking might also be indicative of impaired driving but are often more associated with aggressive or reckless driving behaviors rather than the specific failure to signal. Each of these actions can result from various factors, including distraction or inexperience, but the absence of turn signals more directly points to the consequences of alcohol impairment.