Trivia Tuesday, June 2

Last week's answer

Question: When you're driving down an interstate, the mile markers don't just tell you how far you've traveled—they tell you exactly where you are in the country's grid. If you are driving on a primary, two-digit U.S. Interstate (like I-10, I-80, I-75, or I-95), how can you tell if you are on an East-West route versus a North-South route just by looking at the route number?

Answer: East-West interstates always use even numbers, while North-South interstates always use odd numbers.

The American Association of State Highway and Transportation Officials (AASHTO) created the numbering procedure for interstates across the country. Each interstate is given a one- or two-digit number. Interstates running east and west use even numbers, with the lowest numbered east-west routes starting in the south. Meanwhile, routes running north and south use odd numbers with the lower numbered interstates beginning in the west. 

Sources: Federal Highway Administration