When you plan on leaving the interstate, you should:

Answer: B — Signal and move into the proper lane a mile or more before the exit

Planning your exit from the interstate requires careful consideration of safety and proper signaling. By signaling and moving into the proper lane a mile or more before the exit, you ensure that other drivers are aware of your intentions to leave the highway. This early preparation gives ample time for other motorists to adjust their positions safely and for you to navigate to the exit without rushing. It is also essential to consider traffic flow and road conditions; signaling early allows you to establish your position in the exit lane without causing disruptions or creating hazards. This practice helps maintain smooth traffic movement on the interstate and reduces the risk of accidents that can occur when drivers make sudden lane changes. In contrast, waiting until the last minute to signal could catch other drivers off guard, leading to unsafe conditions. Additionally, changing lanes without signaling disregards the rules of the road and can be hazardous, as it may prevent other drivers from recognizing your maneuver in advance. Proper signaling and lane changes are vital for safety and responsible driving on interstate highways.