Final answer:
If the # on a highway sign is a number in the 100s, it generally means that the road runs north and south. This numbering system is commonly used in the United States for the Interstate Highway System. By contrast, if the highway number is in the 1000s, it generally means that the road runs east and west.
Step-by-step explanation:
If the # on a highway sign is a number in the 100s (e.g., 100, 200, 300, etc.), it generally means that the road runs north and south.
This numbering system is commonly used in the United States for the Interstate Highway System.
For example, Interstate 95 runs north-south along the East Coast. T
he numbers increase as you move from east to west, and the even numbers are used for east-west routes.
By contrast, if the highway number is in the 1000s, such as 1000, 2000, 3000, etc., it generally means that the road runs east and west.