Final answer:
The normal position of the operating brake valve when running over the road is (22-99). It ensures efficient brake operation and optimal performance.
Step-by-step explanation:
The normal position of the operating brake valve when running over the road is (22-99).
When a truck is running over the road, the operating brake valve is typically set to the (22-99) position. This position allows for the efficient operation of the brakes and ensures optimal performance.
The (22-99) position may vary depending on the specific truck and brake system, but generally, it represents the normal position for the operating brake valve during road travel.