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.
The longest Interstate is I-90, which runs from Seattle, Washington to Boston, Massachusetts, a distance of 3,020.54 miles. The second longest is I-80, which covers the 2,907 miles between New York City and San Francisco. The shortest Interstate route segment is I-95 in the District of Columbia which is 0.11 mile long. Interstates 5, 10, 15, 20, 25, 35, 40, 70, 75, 80, 90, 94 and 95 are all more than 1,000 miles long.