Final answer:
An operator of a vehicle must yield right-of-way to the vehicle on the right at an uncontrolled intersection.
Step-by-step explanation:
When approaching an uncontrolled intersection of equal design and surface, an operator of a vehicle must yield right-of-way to the vehicle on the right. This means that if two vehicles arrive at the intersection at the same time, the vehicle on the right has the right-of-way and should go first. It is important to be cautious and follow this rule to avoid accidents.