Describe the "two-second rule."

The "two-second rule" is a technique used to maintain a safe following distance between your vehicle and the one in front of you. This method involves identifying a fixed, stationary object on the side of the road, such as a sign or a tree. When the vehicle ahead of you passes that object, you begin counting seconds until you reach the same object. If you reach it in less than two seconds, you are likely following too closely and should increase your distance for safety. Adopting this rule helps in providing adequate reaction time in case the vehicle in front of you suddenly stops or slows down, thereby reducing the risk of collisions.

Other answers pertain to different driving scenarios. The rule for overtaking involves different considerations such as visibility and speed. Adjusting speed in rain focuses on adapting driving behavior according to weather conditions, while parallel parking techniques are related to maneuvering a vehicle into a confined space. These do not pertain to following distances on the road.