Which of the following is a direct consequence of substance abuse on driving?

Answer: C — Lack of personal readiness

Substance abuse negatively impacts an individual's overall physical and mental state, leading to a lack of personal readiness for driving. This can manifest in various ways, such as impaired judgment, decreased reaction times, and diminished coordination. When a person is under the influence of drugs or alcohol, they are less likely to be mentally and physically prepared to operate a vehicle safely. This lack of readiness can severely increase the risk of accidents, as the person may not be able to respond appropriately to dynamic driving conditions or make sound decisions while behind the wheel. The other options, which suggest positive enhancements, are misleading in the context of substance abuse, as substances typically lead to impaired functioning rather than improvement.