Final answer:
The driver should use the turn signal at least 100 feet before the turn in urban areas and farther in rural areas or higher speeds, considering factors such as driver reaction time and road conditions to ensure safety.
Step-by-step explanation:
Before making a turn, the driver should use the turn signal at a distance significant enough to alert other road users of the intended maneuver. While specific distances can vary by jurisdiction, a common rule is to activate the turn signal at least 100 feet (approximately 30 meters) before the turn in urban areas. However, when driving at higher speeds or in rural areas, the signal should be used even earlier, often suggested to be at least 200 feet (about 60 meters).
It is important to consider various factors that influence stopping distance when making decisions about when to signal and turn. These factors include driver reaction time, road conditions, and vehicle speed. For instance, the stopping distance is greater on wet pavement compared to dry pavement, and a longer distance is needed if the driver's reaction time is slow.
To ensure safe driving practices, signaling early gives other drivers ample time to react and adjust their driving accordingly. It also ensures that pedestrians and other road users are aware of what to expect, contributing to overall road safety.