Final answer:
You should signal approximately 500 feet before turning on the highway to provide other drivers sufficient time to react to the signal.
Step-by-step explanation:
On the highway, you should signal about 500 feet before turning. This distance allows other drivers enough time to notice and react to your signal before you make your turn or lane change. When driving at higher speeds, such as on the highway, it's important to give a longer advance notice because vehicles cover more distance in a shorter amount of time compared to slower residential or city driving. Bridget's observation of cars taking 3 seconds to cover 50 meters can help illustrate the point: at high speeds, a car can travel a significant distance very quickly, hence the need for ample signaling distance.