Golden+Gate+Bridge

Golden Gate Bridge

Jessica Levin Kyle Peters Dan Greenspan Golden Gate Bridge

1. There are 6 lanes and the width of the lanes vary because the barrier between lanes is movable the bridge is 90 feet in width so that gets divide by 6 plus the shoulders. 2. The barrier for this bridge is a moveable one. It is only one foot wide. And there is only one barrier. It separates between north bound and south bound. The number of lanes going each way can change everyday. So if there is a lot of southbound traffic they can make southbound lanes. 3. There is no shoulder on this bridge but there is a walkway. The walkway only opens up on cretin days because of the barrier. It only on the west side of the bridge. 4. The vertical clearance of the bridge is 14 feet at the gate. If a truck is too big the bridge does get higher but not you need to be able to clear the gate of 14 unless you are driving a truck. 5.The bridges height is 746 feet. So I would say is the total height of the bridge.

History -Construction began on January 5th 1933 - Was built to connect the city of San Francisco on The northern tip of the San Francisco Peninsula to Marin county as a part of US highway 101 - Was open to the public on May 27th 1937 - Cost a little over $27 million dollars - The toll when first open was 3 dollars - On September 1, 2002 U.S raised the tolls from 3 To 5 dollars, rate for two axle vehicles and Motorcycles Is 5 dollars cash or 4 dollars with Fas Trek, and Vehicles with more than two axels the toll rate is 2.50 per axle. - Between 1973-1976 the Golden Gate suspension ropes Were replaced, 1980-1982 the bridge was retrofitted to Make it more earth quake resistance

Construction: • The longest part of the bridge, the part between the two towers, in a parabola. • A parabolic shape was chosen because it is strong and can support a lot of weight.

North Tower, Point 1: (0, 746)* Middle of the Bridge, Point 2: (2100, 246)* South Tower, Point 3: (4200, 746)* Parabola: Each side (North and South) of the main towers is a parabola. The total distance on the x-axis of each parabola is 1,125 ft and the change in height on the y-axis is 500 ft. One can be shown as an increasing exponential and the other as a decreasing exponential.* If you wanted to represent the Bridge as one single curve, it would be a "4th order" curve, or something similar to this: y=Ax^4+Bx^3+Cx+D*

Bibliography: "Research Library." Golden Gate Bridge. 11 Apr. 2006. Highway and Transportation District. 13 Dec. 2007 .

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