Who We Serve

Traffic/Transportation Operations

I-95 Corridor Planning Study

RS&H completed a Corridor Planning Study for improvements to Interstate 95, a key north/south arterial highway through Broward and Palm Beach counties, Florida. We developed an innovative feasibility study process, which integrated key elements of travel demand forecasting, traffic operations, and managed lane design. Additionally, we developed a managed lanes access tool to assist in determining the optimum access points and viability of incorporating managed lanes on I-95 for 64 miles from Ft. Lauderdale to West Palm Beach. I-95 continues to serve as a test bed and model for emerging traffic operations and nontraditional capacity solutions throughout Southeast Florida and the state.

Related Services: Planning

SR 1700 Travel Demand Modeling

RS&H performed travel demand modeling and traffic forecasting for the planned widening of SR 1700 in Pitt County, North Carolina.  Alternatives for the proposed improvements include a:

  • three-lane roadway
  • four-lane, median-divided roadway
  • combination three-lane/four-lane roadway
  • five-lane roadway

We prepared traffic forecasts by comparing different methodologies, such as historic and projected growths in traffic volumes, population and employment, and results from the travel demand model.  We then modeled base-year and future-year scenarios with and without the proposed projects using the Greenville Metropolitan Planning Organization (MPO) Regional Travel Demand Model (TransCAD).

The project included extensive coordination with the Greenville MPO and Town of Winterville.

I-85 Traffic Operations Analysis

RS&H performed traffic operations analysis for the proposed improvements to I-85 in North Carolina. The planned project includes widening a 13.5-mile stretch of the existing facility, adding a new interchange, and improvements to two existing interchanges.

The traffic operations analysis involved a two-step process. First, we evaluated the traffic flow conditions in the study area for the 2008 Existing Conditions and 2035 No-Build Conditions to define the purpose and need of the proposed projects. Second, we evaluated different interchange configurations and recommended roadway improvements accommodating the 2035 Build Conditions traffic volumes.

We performed an extensive interchange alternative analysis using Synchro, HCS, and CORSIM and VISSIM software to determine the best fit interchange configuration for each location.  This analysis included minimizing environmental and right-of-way impacts, as well as construction costs, while providing the maximum traffic service to satisfy future travel demand. Findings will be presented in the Interchange Modification Reports and Interchange Justification Reports.

The project was initiated to accommodate the I-85 Master Plan and includes extensive coordination with other projects in the area, as well as Cabarrus and Rowan Counties, the Cities of Concord and Kannapolis, and the Federal Highway Administration.

I-75 Master Plan & Traffic Analysis

RS&H completed a Master Plan for 100 miles of I-75 from the Marion/Alachua County line in North Florida to the Florida/Georgia state line. The goal of the study was to guide development of the intermodal interstate system in order to best serve the travel needs of people and freight, foster economic growth, and minimize fuel consumption and noise pollution.

The study identified improvements based on expected roadway conditions in 2035 and included a wide range of traffic analysis services. We performed regional travel demand forecasting to determine how the forecasted population and employment of the region would affect traffic congestion. We also completed a traffic capacity analysis of the interstate, arterial highways, and intersections using the latest available Highway Capacity Software and Synchro traffic signal software, as well as microsimulation software for complex interchange and arterial traffic signal configurations. 

Related Services:  Planning

I-4 Ultimate Corridor Improvements

RS&H is providing Owner’s Representative services to the Florida Department of Transportation (FDOT) for the $2 billion I-4 Ultimate Corridor Improvements. This project is being developed under our Statewide Public-Private Partnership and Engineering Support Services agreement with FDOT and includes the complete reconstruction of I-4, construction of 141 new bridges, upgrades to 19 urban interchanges, and new ITS systems. Also included are 20 miles of new tolled express lanes, two eastbound and two westbound.

We are producing a value engineering study to identify and develop innovative alternatives to reduce project cost without sacrificing the overall level of service and project intent. We are also developing a detailed cost estimate for the combined project and costs evaluations of each alternative under review. As part of this assignment, the team is undertaking a complete geometric analysis of the whole corridor and updating and analyzing the traffic model.

Concessionaires, general contractors, specialty contractors, and subconsultants interested in the project will be invited to attend an industry forum to hear how FDOT plans to repackage and advance the project. Individual meetings with concessionaire teams will be scheduled to solicit comments on the draft RFP. Following the industry forum, we will work closely with FDOT to refine the RFP and define the project for further refinement and advancement.

95 Express Managed Lanes

To improve congestion on I-95, the 95 Express project in South Florida set out to convert existing high-occupancy vehicle (HOV) lanes to high-occupancy toll (HOT) lanes, or managed lanes. Due to design, operational, and safety issues that can arise when adding managed lanes to an existing highway system, the Florida Department of Transportation partnered with RS&H to to conduct a study that would ensure the express lanes would not disrupt the integrity or safe operations of the corridor.  

Using traffic modeling software, RS&H analyzed traffic operations for the intermediate northbound and southbound HOT lanes access and terminal points. The team successfully integrated the design and operational analysis phases of the project in a feedback loop to ensure that the addition of HOT lanes to the inside of I-95 would not compromise operations or safety. The models provided a complete picture of the proposed operations, which justified the need for the managed lanes project, as well as led to several recommendations for design improvements.  The study ultimately accelerated approval and implementation of the project.

Since opening in 2009, the new express lanes have improved mobility and overall quality of life for drivers along one of the nation’s most heavily travelled corridors.