Final answer:
When there is water on the roadway, drivers should reduce their speed to avoid potential hazards.
Step-by-step explanation:
When there is water on the roadway, you must reduce your speed to avoid potential hazards. Water on the roadway can cause the tires to lose traction, leading to increased stopping distance and difficulty in maneuvering the vehicle. By reducing your speed, you give yourself more time and control to navigate through the water safely.