How does marijuana affect driving performance?

Marijuana significantly impacts driving performance by impairing the ability to react to unusual or emergency situations. When an individual uses marijuana, it can alter cognitive functions, slow reaction times, and diminish coordination, all of which are critical for safe driving. Drivers under the influence may find it challenging to accurately assess their surroundings or respond quickly to unexpected events, such as a pedestrian suddenly crossing the road or an obstacle in their path. This impairment can lead to poor decision-making and increased risk of accidents.

In contrast, the other options suggest effects that don't align with the well-documented consequences of marijuana use on driving ability. Enhancements in concentration or visual perception are misleading; research indicates that marijuana generally hampers these capabilities instead of improving them. Furthermore, the notion that marijuana has no effect on driving is contradicted by extensive studies showing its detrimental impact on driving skills and safety.