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Expressways in western states can and do have occasional at-grade intersections with cross-traffic (that is, travelling perpendicular to mainline site visitors approaching at speeds with speed limits set between 40-65mph (64-104km/h)). Only freeways in those states are guaranteed to haven't any cross-traffic at grade. In most states east of the Mississippi River, the term expressway always means full access control and the term freeway is both a synonym or just isn't used. Primary Interstates have one- or two-digit numbers, with odd ones running north-south (e.g. I-5) and even ones running east-west (e.g. I-80). Although the country was nonetheless a relatively young nation firstly of the 21st century, the United States had established itself as a worldwide power. The United States’ reputation as a progressive nation took maintain after the two World Wars and the Great Depression. In 1958, NASA—the National Aeronautics and Space Administration—started exploring the potentia