19 1/2-mi route is limited-access highway in rugged topography; project involves 10 major and five minor interchanges, two tunnels, and double deck bridge; standards provide for max grades of 5%, horizontal curvature of 4° and design speed of 60 mph; Squirrel Hill Tunnel carries two parallel tubes, each tube having two 12-ft one-directional traffic lanes and sidewalk.


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    Title :

    Design is complicated on Penn-Lincoln Parkway


    Additional title:

    Better Roads


    Published in:

    Better Roads ; 24 , n 1


    Publication date :

    1954


    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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