The **braking distance** is the space a vehicle travels from the moment the brake is applied until it comes to a complete stop. This distance can be affected by several factors, including the **weather** and **road conditions**.

- **Snow or ice on the road**: These weather conditions can make the road slippery, increasing the braking distance. When the ground is covered with snow or ice, the tires have less grip, meaning the vehicle needs more space to stop safely.

- **Rain**: Although not directly mentioned in the question, rain is also an example of how weather can affect the braking distance. Rain reduces tire grip, similar to snow or ice, and requires the driver to maintain a greater safety distance and brake gently.

Therefore, the presence of **snow or ice on the road** is a condition that can clearly increase the braking distance, making it necessary to take additional precautions when driving in these conditions.