If you need to leave the road in a traffic emergency, you should:

Answer: C — Avoid braking until your speed has dropped to about 20 mph.

The most appropriate action to take in a traffic emergency when you need to leave the road is to avoid braking until your speed has dropped to about 20 mph. This approach minimizes the risk of losing control of your vehicle. Abrupt braking can lead to skidding, especially on slippery surfaces, making it difficult to maintain stability while steering the vehicle off the road. Reducing your speed gradually enhances your ability to maintain control as you navigate off the pavement, ensuring you can respond effectively to any obstacles or changes in terrain once you are in a safer area. This is particularly crucial for larger vehicles, which may handle differently compared to smaller cars. While it is important to consider the shoulder's condition and the need to signal intentions to other drivers, acknowledging the right speed and maintaining control of the vehicle must take precedence in a critical situation. Hence, avoiding sudden maneuvers and instead focusing on a consistent reduction of speed will help ensure your safety and that of others on the road.