Parametric Blocks - Intersection Blocks

Last updated: 2021-11-05

These blocks are based on SDD 9a1 At-Grade Side Road Intersections

Parameters

  • RadETW: Radius of edge of travelled way
  • Q: Angle of side road to mainline
  • W: Width of mainline widening at intersection
  • SRLaneWidth:Width of 1 lane on sideroad. The 2 side road lanes in these blocks are equal.
  • R1: Radius of curb return entering mainline.
  • R2: Radius of curb return exiting mainline.
  • TurnLaneLength: Length of full width turn lane for A1, A2, B1, and B2 intersections.
  • Visibility1: Visibility1 can have 2 values
    • Design mode: This visibility state has construction elements to assist with locating and optimal edgeline creation for modeling.
    • Graphics mode: This visiblity state shows only the elements that would be shown in typical plan sheets.

Characteristics

  1. All blocks have an insertion point at the intersection of the edge of the traveled way and the centerline of the side road.
  2. All blocks have the attributes appropriate to their specific classifications (curb & gutter, turn lanes)
  3. All half intersections have a block for
    1. tangent
    2. inside of curve
    3. outside of curve
  4. All geometry is stored in polylines and curves.