What can be caused if the road surface suddenly becomes worse?

You answered correctly. When the road surface suddenly worsens, for example due to potholes, loose gravel, or uneven pavement, it can increase the risk of sliding and skidding because tires have less grip. It can also cause changes in tire noise, as rough surfaces create different sounds compared to smooth ones. It does not influence the reaction distance, which depends on your attention and speed, not the surface. Recognizing these signs helps you adjust your driving and remain safe when the road condition suddenly changes.