When are the two special conditions where you should downshift?

Downshifting is an important technique that helps maintain control of a vehicle, especially under specific driving conditions. The correct choice highlights two situations where downshifting is particularly beneficial: before starting down a hill and before entering a curve.

Before starting down a hill, downshifting allows the driver to use engine braking, which helps to maintain a safe speed without relying solely on the brakes. This is crucial because going downhill can cause the brakes to overheat, leading to reduced effectiveness and potentially dangerous situations. By downshifting, the driver engages a lower gear that helps to control the vehicle's speed and ensures a smoother descent.

Before entering a curve, downshifting also plays a critical role in maintaining control. When a driver approaches a curve, reducing speed is essential to negotiate the turn safely. Downshifting allows the driver to slow down without having to use the brakes excessively, which can cause the vehicle to skid or lose traction. By downshifting, the driver positions the vehicle in a lower gear, enabling better acceleration out of the curve once the steering input is applied, enhancing stability and control.

In contrast, the other options provided do not specifically relate to scenarios where downshifting is a standard practice for maintaining vehicle control or safety. Hence