SR-91 Geometric and Design Alternatives Analysis
As a heavily traveled highway, SR-91 experiences some of the highest congestion levels in Orange County. An Alternatives Analysis Report has been developed, exploring options to accommodate these high traffic volumes.
SR-91 is one of the busiest highways in Orange County, particularly the corridor stretching from Anaheim Hills into Corona. This corridor sees over 250,000 motorists per day, and traffic volumes are projected to increase. In coordination with RCTC, OCTA is proposing the implementation of an additional EB general purpose lane between SR-241 and SR-71 to address congestion issues in the City of Corona.
Preparation of the Feasibility Study Report required coordination with adjacent projects, such as the improvements to the SR-91/SR-241 interchange.
Advanced Civil Technologies led the preparation of an Alternative Analysis Report, which proposed four alternatives for the implementation of the EB general purpose lane. This corridor is heavily constrained, as the Mindeman Landslide to the south and the Santa Ana River to the north limit the amount of widening that can occur. Each alternative was designed to minimize impacts to both features, allowing OCTA to determine the most feasible approach to constructing the new lane. In addition to managing the project, our team led the preparation of design options, project schedule, and cost estimates.
Preparation of the Feasibility Study Report has required coordination with adjacent projects, such as the improvements to the SR-91/SR-241 interchange.
Additionally, Advanced Civil Technologies led the complex stakeholder coordination efforts necessary for this project. Because the project spans multiple counties, coordination was required with OCTA, RCTC, Caltrans Districts 12 and 8, TCA, and multiple cities. Interviews were conducted to ensure stakeholder priorities were accommodated in the design of each alternative. Coordination also took place with several adjacent project efforts, including improvements to the SR-91/SR-241 and SR-91/SR-71 interchanges. Our team worked closely with these efforts to ensure compatibility, minimize throwaway costs between projects, and reduce construction impacts to motorists.
