Illiana Expressway Preliminary Design

Location: Washington and Will Township in Will County, Illinois

Status: Completed


IDOT Contract No. P-91-749-10

Project Description

ILLIANA Corridor known as “B3” Segment # 6 (4.1 miles)

The Illinois department of transportation (IDOT) ,The Indiana department of transportation (INDOT) , and the Federal Highway administration (FHWA) Segment # 6 The project included the design of main line “ILLIANA Corridor”, “S. Dixie Hgwy.”, Four interchange ramps and “S. Ashland Ave”.


GSG provided interchange design study and functional phase plans relative to the existing roads and topography. GSG’s services consisted of the following:

  • Design new horizontal and vertical alignment for each road.
  • Horizontal and vertical sight distance analysis.
  • Geometric design for road elements and Vehicle movement turning radius analysis.
  • Superelevation design for varies types of curves.
  • Intersection design with turning and storage lanes.
  • Vertical clearance calculations for two over passing bridges.
  • Apply Roadside safety measures with clear zones, front slopes and road side barrier and medians.
  • Generate proposed cross sections using corridor modeler from GeoPak program according to IDOT standards.
  • Typical section design and stationing limits for each case.
  • Pavement marking and pavement section design.
  • Earth work volume computation and balancing.
  • Quantities and cost estimate calculations.
  • Cross streets closure analysis
  • Delineated the new right of way limits based on the new design.

GSG Advantage

This was fast track project which requires coordination between multi-disciplinary team. GSG provided the required geometric and topographic studies for different alternatives and conditions. GSG worked closely with the project team and delivered the required services within time and budget.

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