What should you do to avoid tipping when making sharp turns with a double trailer?

Answer: C — Reduce speed

Reducing speed is the key action to take when making sharp turns with a double trailer. When negotiating sharp turns, especially with longer combinations like doubles, the risk of tipping can increase significantly. By reducing speed, you lower the center of gravity and help maintain control over the vehicle, which minimizes the chances of the trailers overturning or becoming unstable. Sharp turns can create a significant lateral force on the trailers; therefore, approaching the turn at a slower speed allows for smoother navigation without abrupt changes in momentum that could cause the trailers to sway excessively. This controlled approach also enables better steering coordination to effectively manage the twin units without losing balance. In contrast, increasing speed can exacerbate instability, while braking suddenly may lead to skidding or loss of control at critical moments. Using overdrive gear, which is typically meant for fuel efficiency on straight paths, would not be appropriate in this scenario as it can affect the vehicle's power and responsiveness during complex maneuvers.