For decades, residents in Indiana debated the need for an interstate to connect Indianapolis to Evansville in Southwestern Indiana. Lochmueller Group (Lochgroup) helped the Indiana Department of Transportation (INDOT) produce the Tier 1 Environmental Impact Statement (EIS), which selected a broad corridor for the 142 miles of interstate.
In April 2004, INDOT initiated the I-69 Tier 2 Studies & Environmental Impact Statements, which then narrowed the study to an actual alignment within the selected corridor. INDOT hired Lochgroup as the Program Manager to oversee the project development activities of six section consultants. Lochgroup also performed corridor-wide traffic modeling and analysis and environmental and ecological studies.
The traffic-related services included travel demand modeling, forecasting, microsimulation, and transportation systems analysis and traffic operations analysis. Lochgroup also developed a highly disaggregated I-69 Corridor sub-area model based on the Indiana Statewide Travel Demand Model, which will serve as a basis for long-range traffic forecasts and as an input to microsimulation models.
Microsimulation analysis was also performed on the segments of I-69 that serve heavily urbanized areas, specifically Bloomington, Martinsville, and Indianapolis. In these three areas, questions concerning access, frontage roads, roadway and interchange design, and traffic operations were addressed.
The microsimulation models featured detailed network, 3D environment and terrain, vehicle-actuated signalized intersections, and mix of vehicle fleet composition. All models were calibrated for the base year with extensive mainlane counts and turning movement volumes. Video footage from main intersections was compared visually with the animations resulting from the simulation.
Lochgroup’s professionals then calculated the average performance measures for each design concept based on repeated modeling runs.