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TransModeler Traffic Simulation Software

  • Traffic and Revenue Consultant Services for the I-70 Mountain Corridor
    For the Colorado DOT and Louis Berger, Caliper is providing traffic and revenue forecasts and modeling services to evaluate alternative tolling scenarios for the I- 70 Mountain Corridor. In the current Level 1 analysis, Caliper modified the 2003 I-70 Mountain Corridor Programmatic Environmental Impact Statement (PEIS) Travel Demand Model so that traffic assignment could support tolling, variable values of time and user classes, and variable reversible lane facilities. The input demographics were also estimated for the 2010 scenario year. Once the model updates were performed, Caliper estimated toll volumes and revenues along the corridor under several scenarios with various toll networks and values of time. Work is anticipated to advance to a Level 2 phase, where a traffic microsimulation model of the corridor will be used to evaluate several design alternatives, tolling operations for reversible lanes, and use of shoulder lanes during peak periods. This more detailed, operationally focused analysis will inform CDOT’s decisions with respect to the future of the corridor.
  • Lake County Area-Wide Microsimulation Model (LAMM)
    Caliper delivered a 450-square-mile microscopic traffic simulation model spanning most of Lake County, CA to the Lake County/City Area Planning Council. The focus of the model is the management of traffic demand between routes north and south of Clear Lake. The study area includes 720 road miles, 120 of which are on State Routes 20, 29, and 53. The model also includes considerable local network detail in the towns through which the routes pass. During the calibration and validation of the model, simulation-based Dynamic Traffic Assignment (DTA) was used to test alternative strategies for traffic calming and access management in the towns with a view to attracting traffic to the route south of the lake, which impacts local communities to a much lesser degree. Daniel Morgan was project manager for the LAMM project, and David Gerstle did much of the hands-on work calibrating the AM and PM base year scenarios to 15-minute directional and turning movement count data, developing the future-year geometries, and generating the performance metrics for various build and future-year scenarios.
  • Wide Area, High Fidelity Traffic Simulation for MAG
    For the Maricopa Association of Governments, Caliper is developing the largest, high fidelity microsimulation model ever attempted. Using TransModeler, vehicle traffic is being simulated within a 500 square mile area of Phoenix using a microscopic model with a .1 second time step. The network includes more than 1800 traffic signals which are being simulated at the same time. The network is represented at the lane level with accurate intersection placement and geography. An equilibrium dynamic traffic assignment (DTA) is performed using the microscopic loading. On a fast PC, the running times are fast enough to make a microscopic simulation-based DTA a reality.
  • Central Phoenix Inner Loop Traffic Operations Model
    Caliper completed the development of the Inner Loop Traffic Operations model, which serves as the operations analysis tool in support of MAG’s Central Phoenix Transportation Framework Study. This study aims to prioritize projects that have the best chance of delivering mobility and safety improvements across Central Phoenix. The project is the largest microscopic traffic simulation model ever completed, covering more than 500 square miles of Central Phoenix and surrounding cities. The model was developed with inputs from the regional travel demand model in TransCAD, calibrated against 15-minute traffic counts, and validated against bottleneck location and severity derived from 15-minute INRIX speed data. The project also involved the exploration of multi-resolution simulation and simulation-based Dynamic Traffic Assignment (DTA) model techniques, such as mesoscopic and hybrid microscopic-mesoscopic simulation.
  • Calibrated County-Wide Microscopic Traffic Simulation Model for Whatcom Council of Governments
    Caliper has developed a detailed, geographically accurate microscopic traffic simulation model of the entire Whatcom County located in the state of Washington. The model, in Caliper’s TransModeler traffic simulation platform, covers a geographic extent of nearly 1,000 square miles. The simulation has been calibrated using time-varying segment and turning movement counts, and a portion of the model has further been validated against speed measurements. The simulation period of 12:00 PM - 6:00 PM includes the evening peak of 4:00 PM - 6:00 PM. Learn more»
  • Capital Beltway High Occupancy Toll (HOT) Lanes
    Caliper Corporation has developed a TransModeler traffic simulation of the forthcoming High Occupancy Toll (HOT) lanes on the Capital Beltway (I-495) in Virginia with Transurban, a leading toll road owner and operator in Australia and North America. The Capital Beltway HOT Lanes project is a nearly two billion dollar public-private partnership that is intended to be an innovative solution to traffic congestion through dynamic, open-road tolling. Sensors will monitor traffic levels continuously, and a tolling algorithm designed to maintain a target level of service in the HOT lanes will adjust the price dynamically. Drivers who choose to use the HOT lanes will pay a toll conveyed to them via dynamic message signs. Carpools with three or more persons, buses, and emergency vehicles will be able to use the HOT lanes without charge.
    Caliper Corporation developed a pilot TransModeler micro-simulation model for the I-270 corridor in Montgomery County, MD. This work was conducted for the University of Maryland’s Center for Advanced Transportation Technology (CATT) and Maryland’s State Highway Administration (SHA). The objective of this project was to demonstrate the feasibility and benefits of TransModeler in supporting large-scale corridor analyses such as the Integrated Corridor Management (ICM) initiative by the US DOT. The ICM initiative aims to demonstrate the use of Intelligent Transportation Systems (ITS) to plan and manage congested traffic corridors by assisting decision-makers in identifying gaps, evaluating strategies, and investing in the best combination of strategies that would minimize congestion and improve safety. The I-270 corridor in Maryland is one of eight test sites selected by the US DOT.
  • Microsimulation of Greater Eureka Area, CA
    Caliper completed a wide-area simulation project for Caltrans District 1 that covered the entire city of Eureka, CA (16 square miles) and portions of US Highway 101 beyond Eureka’s city borders (17 miles in total). The project was a critical demonstration of the feasibility of city-wide microsimulation and integration with a regional travel demand model. Calibration of the simulation model very nearly met or exceeded FHWA standards for link flows and travel times. Calibration methods included incorporating GIS data (e.g., land use classification data) into the origin-destination matrix estimation process, and estimating dynamic trip matrices and route choices using simulation-based Dynamic Traffic Assignment (DTA) techniques. These innovative calibration methods have since become routine in TransModeler projects performed by Caliper.
  • Whatcom County Area-Wide Microsimulation Model
    Caliper developed a microscopic traffic simulation model of Whatcom County, WA. The existing microsimulation database in TransModeler was expanded to the scope of the regional travel demand model, with a detailed representation of highway geography and traffic signal control in the region. Time-varying origin-destination (OD) demand were estimated to match available field data, and a Dynamic Traffic Assignment (DTA) based on TransModeler’s microscopic traffic simulation was used to estimate a consistent set of congested travel times. The high prevalence of truck traffic and the crossings along the Canadian border caused further challenges to accurately modeling dynamic trip patterns, route selection behavior and vehicle interactions. The completed large-scale model will be used to assist planning and traffic operations staff with conducting scenario analyses and evaluating traffic management strategies for informed decision-making.
  • City-Wide Microsimulation Model for Virginia Beach
    Caliper assisted Old Dominion University in the development of a microsimulation model of Virginia Beach, VA for the City of Virginia Beach. The project required the calibration of a city-wide model for the morning, midday, and evening periods. The study region spans 250 square miles of land area–500 square miles total–and has over 300 traffic signals, each with a distinct timing plan for each study period. The model required the use of simulation-based Dynamic Traffic Assignment (DTA) and other innovative traffic simulation and model calibration methods to analyze traffic on alternative routes through the congested city. Old Dominion University researchers and City of Virginia Beach staff were trained to use the model and are presently applying the model in the study of various major roadway projects and evacuation studies with continuing support from Caliper.
  • A Regional Microscopic Dynamic Traffic Assignment for Jacksonville, FL
    For the North Florida Transportation Planning Organization (NFTPO) and HNTB Corporation, Caliper developed a Dynamic Traffic Assignment (DTA) model that links with the NFTPO’s activity-based model (ABM) in DaySim and, for truck and external trips, with NFTPO’s regional trip-based travel demand model. The simulation-based DTA model relies on a high-fidelity microscopic traffic simulation of the entire six-county NFTPO service area. The model is designed to serve the NFTPO as an operational and visualization tool for the study and evaluation of managed lanes and other proposed projects. The DTA model can read trips from the DaySim and trip-based model scenarios and perform a dynamic assignment. In the future, the DTA model can be integrated with the ABM as a dynamic substitute for the current static traffic assignment. In parallel with the project, Caliper developed state-of-the-art network conflation and GIS tools to create a master network that combines the geographic accuracy of the HERE street network with the functional class and model attributes of the travel demand model network, giving the NFTPO a more accurate basis for the highway and transit assignments in their current ABM framework.
  • County Route 93 (Myers Corners Road/Middlebush Road) Corridor Management Plan
    The Poughkeepsie-Dutchess County Transportation Council (PDCTC) is working with Wilbur Smith Associates to develop a Corridor Management Plan that identifies and recommends policy and project actions to improve vehicular and non-vehicular movement along CR 93 in the Town of Wappinger, New York. The Town of Wappinger sits in the southern part of Dutchess County, which has experienced a large increase in population over the past ten years. This increase in population has contributed to increased traffic volumes on the CR 93 corridor and, in turn, resulted in poor levels of service during peak periods. Dutchess County and the Town of Wappinger expect future population growth and the continued appeal of CR 93 to intensify already poor traffic conditions. The CR 93 Corridor Management Plan will inform decision-makers, the public, local agencies, and other stakeholders about the causes of traffic congestion on CR 93 and recommend potential solutions. As part of the analysis, Wilbur Smith Associates will use TransModeler to prepare micro-simulations of the corridor, including current year and future year base scenarios as well as several future year alternatives implementing various land use and transportation strategies. The TransModeler micro-simulations will allow the PDCTC, the project’s Advisory Committee and the public to visualize alternatives for the corridor and understand trade-offs between the alternative scenarios.
  • State Route 91 corridor system management plan
    CLR Analytics is developing, calibrating, and validating a traffic microsimulation model for the State Route 91 (SR-91) Corridor System Management Plan (CSMP) study in Orange County, CA. The calibrated model will be used as the base model for testing alternative build scenarios under future conditions. The Orange County section of the SR-91 is 25 miles long from the Los Angeles County line to the Riverside County line and includes interchanges with 5 different freeways. SR-91 contains both HOV, Toll, and mixed use lane facilities. All freeway facilities as well as most major arterials and their signalized intersections are included in the model. This model focuses on both the morning and afternoon rush hours from 6:00 to 10:00 AM and 2:00 to 8:00 PM, respectively, in order to cover all periods of congested travel.
  • Downtown Owensboro traffic study
    ENTRAN, PLC is evaluating the impacts of the Downtown Owensboro Master Plan, a comprehensive set of recommendations that will change and revitalize the face of downtown in this western Kentucky city. The recommendation to convert downtown streets from one-way flow to two-way operation is a keystone of the entire plan. The simulation model in TransModeler will be integrated with the TransCAD county-wide travel demand model to predict changes in travel patterns that would result from the conversion and to evaluate the associated operational impacts. From the analyses, improvements to the street system, including the addition of turn lanes and modifications to traffic signals, will be identified. The study also will involve a complete street analysis using methods from the recently completed National Cooperative Highway Research Program (NCHRP) Report 616, Multimodal Level of Service Analysis for Urban Streets. The methods predict level of service from the perspective of the traveler for the four modes most commonly found on urban streets – autos, buses, bicycles and pedestrians. Finally, the project includes a parking inventory and analysis that will be used to develop a downtown parking management plan.

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