How should you react if you encounter a slippery road surface?

Reducing speed gradually and avoiding sudden movements is the correct approach when encountering a slippery road surface. This method allows for better control of the vehicle, as sudden changes in speed or direction can lead to loss of traction, increasing the risk of skidding or losing control. By gently easing off the accelerator and applying brakes softly, drivers can maintain stability and prevent the wheels from locking up, which enhances safety on slippery conditions. This cautious response helps to navigate the road more effectively, especially in wet or icy conditions, where maintaining traction is essential for safe driving.

The other options entail abrupt actions that could significantly compromise vehicle control. Braking hard can lead to skidding, while accelerating might also cause the wheels to spin and further reduce traction. Changing lanes quickly could result in losing control, especially if other vehicles or obstacles are nearby. Overall, a gradual approach to managing speed is vital for maintaining safety on slippery surfaces.