Overview. If you frequently experience shortness of breath or you hear a whistling or wheezy sound in your chest when you breathe, you may have asthma â a chronic condition that causes inflammation and narrowing of the bronchial tubes, the passageways that allow air to enter and leave the lungs.
1 At 47,958 kilometres (29,800 miles) in total length, the Pan-American Highway is the longest road in the world.  The road starts in Alaska, North America and ends in the lower reaches of South America.
Interstate 90 (I-90). The longest Interstate Highway 90 in the United States, the highway extends to 3,099.07 miles (4987 km. Walking parallel to U.S. Route 20 for the most part. Eastern tip is in Boston and the west end in Seattle. It crossed the Continental divide just east of Butte, Montana.