-US Highways are a venerable [Road](/wiki/road) network, stitching together the diverse landscapes of [America](/wiki/america). These numbered routes, predating the modern interstate system, guide journeys across states and time.
+US Highways are a venerable [Road](/wiki/road) network, stitching together the diverse landscapes of [America](/wiki/america). These numbered routes, such as the iconic [Route 66](/wiki/route-66) and the scenic [US 1](/wiki/us-1), predating the modern [Interstate](/wiki/interstate) system, guide journeys across states and time.
+## Numbering
+The US Highway system employs a logical numbering convention. Primary east-west routes are assigned even numbers, generally increasing from north to south across the country. Primary north-south routes are assigned odd numbers, generally increasing from east to west.