To drive safely over puddles of water, it is important to **reduce speed** to prevent the vehicle from losing stability. This is due to a phenomenon called **aquaplaning**, which occurs when the tires cannot displace all the water from the road, causing the vehicle to skid and lose control.

- **Aquaplaning**: It happens more easily at high speeds and with worn or very wide tires. Therefore, it is crucial to drive slowly in areas with water to maintain control of the vehicle.

- **Driving in the rain**: Tire grip decreases, which means the vehicle needs more space to brake. Reducing speed helps maintain control and brake safely.

- **Additional precautions**: After passing through a puddle, it is advisable to check that the brakes are working correctly, as water can affect their effectiveness.

In summary, passing over puddles at a moderate speed is essential to avoid losing control of the vehicle and ensure safe driving.