Final answer:
A driver should signal at least 100 feet before their intended turn to ensure road safety. This signal distance provides other road users with sufficient time to react to the turning vehicle's intentions. Safety on the road depends on clear communication and proper reaction times.
Step-by-step explanation:
The correct answer to when a driver should signal before an intended turn is a) 100 feet. It's important for safety reasons that drivers signal their intentions in advance to communicate with other road users. This distance allows other drivers and pedestrians to become aware of the turning vehicle's intentions and respond accordingly. The distance can also be related to the length of cars; typically, a car length is about 15 to 20 feet, so signaling at 100 feet would be equivalent to signaling about 5 to 6 car lengths ahead.
When crossing the road, it is essential to ensure there is enough distance for an approaching car to stop or for you to safely reach the other side without any risk. The required distance depends on various factors such as the speed of the car, road conditions, and the driver's reaction time. As an example, if a car is 28 meters away, which is the length of approximately 8 cars, and it is traveling at a slow speed with a clear view, it might be safe to cross. However, if the car is moving quickly or road conditions are not ideal, more distance would be needed to ensure safety.