A hazy, sunny, summer afternoon aerial view from above Bellevue, WA looking west across Mercer Island and Lake Washington to the downtown Seattle skyline. Puget Sound can barely be seen just beyond. Interstate 90, I-90, seen below runs across the country from Boston and ends in Seattle, making it a major national roadway. In the Seattle area, roughly 100,000 cars daily cross the bridge between Seattle and the suburban Eastside.