Blood urea nitrogen (BUN) test. Overview. A common blood test, the blood urea nitrogen (BUN) test reveals important information about how well your kidneys and liver are working. A BUN test measures the amount of urea nitrogen that's in your blood. 1  Your liver produces ammonia â which contains nitrogen â after it breaks down proteins used by your body's cells.  The nitrogen combines with other elements, such as carbon, hydrogen and oxygen, to form urea, which is a chemical waste product.
Shortly after the Turner Turnpike was built in 1953, the Oklahoma Turnpike Authority proposed other toll roads including one to be built from Oklahoma City north to the Kansas border near Braman to tie in with the southern terminus of the Kansas Turnpike at the state line.
By the time Congress created the Interstate Highway System in 1956, nearly all Chicago-area expressways were laid out, but federal funding pushed construction into high gear. The Kennedy Expressway opened in 1960, linking the Loop to the new O'Hare Airport and the Northwest Tollway (I-90). The Dan Ryan Expressway opened to 95th Street in 1961â62. The abandoned Illinois & Michigan Canal provided a convenient right-of-way through the city for the Stevenson Expressway (I-55), opened in 1964.