Spokane's streets use a grid plan that is oriented to the four cardinal directions; generally, the east–west roads are designated as avenues, and the north–south roads are referred to as streets. Major east–west thoroughfares in the city include Francis, Wellesley, Mission, Sprague, and 29th Avenues. Major north–south thoroughfares include Maple–Ash, Monroe, Division, Hamilton, Greene–Market (north of I-90), and Ray–Freya (south of I-90) Streets. Division Street divides the city into East and West, while Sprague Avenue splits the city into North and South. Division Street is Spokane's major retail corridor; Sprague Avenue serves the same purpose in Spokane Valley. With over 40,000 vehicles per day in average daily traffic from Interstate 90 north to the US 2–US 395 junction, North Division is Spokane's busiest corridor.