Mapquest – “Ranking the Lower 48’s two-digit, primary interstates—66 in all, 47,000 miles (and counting)—is a subjective business. What do you make of an I-70? In parts it’s bumper-to-bumper with commuters, elsewhere isolated fields of corn. To help, we turned to algebra, and created a “traffic rating” based on vehicle travel miles per mile of interstate (1.0 is least busy, 5.0 the most). We weigh that against the general joy of the ride as a whole, often rewarding longer highways—the true “interstates”—or thematic regional rides, over mere connectors to suburbs or coastal towns. Also, remembering the time when many roads had names (eg “Lincoln Highway”) not numbers, we’re suggesting new monikers for each road too. And, honestly, we can’t wait to see the merch for I-10’s new name, The Neck Beard. Here we go, worst interstate to best.”