Long-span,segmented-concrete,cable-stayed bridges such as Hale Boggs in Louisiana and the Sunshine Skyway in Florida,and remarkable tunnels like Fort Mchenry in Maryland and Mr.bakerin Washington developed under the nations physical challenges,Traffic control systems and methods of construction developed uder the interstate program soon influenced highway construction around the world,ang were invaluable in improving the condition of urban streets and traffic patterns.

　　Today .the interstate system links every major city in the U.S,and the U.S with Canada and Mexico,Built with safety in mind the highways have wide lanes and shoulders,dividing medians,or barriers,long entry and exit lanes,ourves engineered for safe turns,and limited access,The death rate on highways is half that of all other U.S roads

　　By opening the North American continent,highways have enabled consumer goods and services to reach people in remote and rural areas of jobs,access to the growth options in terms of jobs access to cutural progreams health care ,and other benefits.Above all,the interstate system provides individuals with what they enerish most:personal freedom of mobility.

　　The interstate system element of the nations economic growth in terms of shipping and job creation:more than 75 percent of the nations freight deliveries arrive by truck.and most products that arrive by rail or air use interstates for the last leg of the journey by vehiole.

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