Illinois Driving Permit Practice Test

What is a common indicator of impaired driving?

1. Consistent speed and lane alignment

2. Weaving within the lane or erratic speeding

3. Use of turn signals

4. Driving without headlights at night

The correct answer is: Weaving within the lane or erratic speeding

Weaving within the lane or erratic speeding is considered a common indicator of impaired driving because it demonstrates a lack of control and coordination, which often occurs when a driver is under the influence of drugs or alcohol. Impaired drivers may struggle to maintain a steady course, leading to swerving or an inability to keep a consistent speed. This erratic behavior can be a sign that the driver is unable to respond to road conditions and traffic signs effectively, significantly increasing the risk of accidents. In comparison, consistent speed and lane alignment, as well as the proper use of turn signals, signify that a driver is likely maintaining good control of the vehicle. Driving without headlights at night could be a sign of negligence or distraction but does not specifically indicate impairment in the way that erratic movements do. Understanding these behavioral cues is critical for identifying potentially dangerous drivers on the road.