The significance of the numbers on red, white, and blue interstate signs includes which of the following?

• A. Two-digit Even numbers indicate East to West, two-digit Odd numbers indicate North to South, and three-digit numbers indicate a bypass of a city (the last two digits tell you which interstate you will join up with)
• B. Even-numbered routes indicate North to South
• C. Odd-numbered routes indicate East to West
• D. Three-digit numbers indicate a bypass of a city, but the last two digits have no meaning

Answer: (A)

Interstate numbers are designed to tell you both direction and how a route connects to others. Even two-digit routes run east–west, with lower numbers toward the south and higher numbers toward the north; odd two-digit routes run north–south, with lower numbers on the west and higher numbers on the east. When you see a three-digit route, it’s an auxiliary road that serves a city area—often a bypass or beltway—and the last two digits indicate the primary interstate it’s connected to. This setup lets you infer not just direction, but also how a route bypasses a city and which main highway it links to.

So this description matches how the numbers work: two-digit even for east–west, two-digit odd for north–south, and three-digit numbers for city bypasses with the last two digits showing the parent interstate. The other statements misstate the orientation rules or claim the final digits have no meaning, which isn’t accurate.