Final answer:
The driver of the vehicle on the left must yield the right-of-way to the vehicle on the right when multiple vehicles approach or enter an intersection at approximately the same time.
Step-by-step explanation:
When two or more vehicles approach or enter an intersection at approximately the same time, the driver of the vehicle on the left must yield the right-of-way to the vehicle on the right. This rule is based on the principle of giving priority to the person on the right in situations where multiple vehicles are entering a space simultaneously. It helps to ensure smoother traffic flow and prevent accidents.