These factors include calcium intake, seasonal variations of 25-hydroxyvitamin D levels, sun exposure, air pollution levels, exercise, obesity (resistance to standard doses of vitamin D), comorbid conditions, and medications.
FDOT estimates that the 55,000 cars per day cross the three-mile long bridge connecting Pensacola and Gulf Breeze, and that the number will be exceed 70,000 by 2040. The bridge was built in the 1960s and a 2009 federal survey declared the bridge was in need of replacement.
The Mackinac Bridge is the longest suspension bridge in the western hemisphere. The total length of the Mackinac Bridge is 26,372 feet. The length of the suspension bridge (including anchorages) is 8,614 feet. The length from cable bent pier to cable bent pier is 7,400 feet. Length of main span (between towers) is 3,800 feet. The width of the roadway is 54 feet.