On October 25, 1931, 75 years ago today, the George Washington Bridge opened to traffic.

Spanning the Hudson between Washington Heights and Fort Lee, New Jersey, the bridge cost about $60 million to build.

Plans for the bridge were in the works as early as 1906. The lower deck was completed in 1962, bringing the total number of traffic lanes to 14.

The bridge span is more than 4,700 feet. Last year 107-million vehicles used the bridge.

The general manager of the bridge says a lot of work goes into maintaining the bridge.

"Lighting, paving, structural integrity, those are some of the things the maintenance force here focuses on," said Bob Durando.

When it first opened, the toll was just 60 cents. Today the cash toll is $6 for cars to cross the bridge city-bound, and trucks are now only allowed on the upper level.

The George Washington Bridge is the fourth-largest suspension bridge in the world.