It is a busy road, but busy doesn't always equal primary. International Drive mainly serves as a connection to the commercial and residential areas that are within the northeastern quadrant of Tysons rather than serving as a major arterial road like Gallows Road, Route 123, and Route 7, which all connect several towns and cities in the area and serve as alternatives to nearby freeways. International Drive does have a connection to the DTR, but if you're going up Gallows Road to get onto the DTR, it is more direct to make a left onto VA 7 rather than to follow International Drive.