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Existing Conditions & Project Requirements defined in Task 2: Existing…

- - - - Retain for alignment development
        
        2 - HORIZONTAL & VERTICAL ALIGNMENT
        
        DEVELOP HORIZONTAL AND VERTICAL ALIGNMENT OPTIONS
        TMR: Sections 2.3, 3.2.3.2, 3.3 and 3.5
        
        Constant-radius curved bridge
        
        Crested vertical profile
        
        Constant grade
        
        Approximately level bridge
        
        Straight bridge with curved approaches
        
        CHECK:
        
        Horizontal curvature and superelevation
        
        Vertical geometry and approach grades
        
        Crossing skew
        
        Bridge width and cross-section
        
        Required vertical and hydraulic clearances
        
        Structural-depth envelope
        
        Pier and abutment placement
        
        Span regularity
        
        Construction-method compatibility
        
        Design speed and sight distance
        
        IS THE ALIGNMENT FEASIBLE?
        
        YES
        
        1 more item...
        
        NO
        
        4 more items...
    - - ► Modify ferry/construction staging
      - ► Reject if the constraint cannot be resolved
      - ► Refine corridor or tie-ins
- - - - 3 - HORIZONTAL ALIGNMENT
        
        H1: Straight bridge
        
        H2: Compound curve bridge
        
        H3: Constant radius bridge
- - - - REJECT:
        
        Too costly
        
        High environmental disturbance
        
        Hydraulic