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 majority of the world's 10 longest highways are located in the US, including the world's longest-the Pan American Highway-which spans a whopping 48,000km. Roadtraffic-technology.com lists the 10 longest highways in the world by total length.