Which statement about interstate routes with even numbers is true?

The statement that interstate routes with even numbers travel east/west is accurate. In the United States, the numbering system for interstate highways follows a specific convention: even-numbered routes are designated for east-west travel, while odd-numbered routes are designated for north-south travel. This system helps drivers easily identify the direction of travel based on the route number. For instance, an interstate highway numbered 80 is an east-west route, while one numbered 81 would indicate a north-south direction.

The other statements do not hold true or are too broad. For example, while even-numbered routes are typically interstate highways, not every even-numbered road fulfills that criterion, as other roads may also have even numbers but are not part of the interstate system. Additionally, characterizing them as slower than local roads is misleading, as interstate highways are designed for faster travel and typically have higher speed limits than local roads, making them more efficient for long-distance travel.