KEY LARGO, Florida Keys -- The Florida Keys Overseas Highway, from just north of Key Largo to Key West, is now an All-American Road.

The designation was announced Oct. 16 by U.S. Transportation Secretary Ray LaHood and a plaque was presented by Victor Mendez, administrator of the Federal Highway Administration, during a ceremony in Washington, D.C.

The Keys highway is the only All-American Road in Florida. It's the highest recognition possible under the National Scenic Byways program established by the U.S. Congress in 1991. Only 30 other roadways in the nation have earned the prestigious title.

Originally completed in 1938, the Overseas Highway incorporates 42 bridges over the waters of the Atlantic Ocean, Florida Bay and the Gulf of Mexico. They include the Seven Mile Bridge at Marathon, which stretches 6.79 miles across open water and was referred to on its completion as "the eighth wonder of the world."

Under the Federal Highway Administration’s National Scenic Byways program, roads can be recognized as National Scenic Byways or All-American Roads based on their archeological, cultural, historic, natural, recreational and scenic qualities.

To earn All-American Road status, a thoroughfare must possess characteristics of national significance and features that don't exist elsewhere, making it a visitor destination in itself.

"The All-American Road designation will bring status to us with international and domestic visitors, so that they know driving U.S. 1 from Key Largo to Key West is a one-of-a-kind driving experience," said Judy Hull, president of the Florida Keys Scenic Corridor Alliance that spearheaded a multi-year effort to achieve the distinction, who was in Washington for the ceremony. "It should help us with tourism and future highway grant funding."

The Overseas Highway follows a trail originally blazed in 1912 when Standard Oil millionaire Henry Flagler completed the extension of his Florida East Coast Railroad from Miami to Key West. Construction of the highway began after the railroad ceased operation following a 1935 hurricane.

In 1982, 37 of the original bridges including the Seven Mile Bridge were replaced with wider spans. Most of the historic bridges still stand alongside the newer ones and now serve as fishing piers for anglers.

In 2001, the roadway was named a Florida Scenic Highway, laying the foundation for its national designation.

As well as the Overseas Highway, officials announced four other All-American Roads. They are Historic Route 66 in Arizona, Maine's Acadia All-American Road Trenton Extension, the Harriet Tubman Underground Railroad Byway in Maryland and Michigan's Woodward Avenue (M-1) Automotive Heritage Trail.