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Research Project Description

Center Identification Number: 473-14

Project Title: Worksite Trip Reduction Model and Manual

Principal Investigators:
Philip L. Winters

Francis Cleland

Center for Urban Transportation Research
University of South Florida
Tampa, Florida

External Project Contact:Michael Wright, Program Manager, FDOT

I. Project Objective 

To develop a Worksite Trip Reduction Model and Manual that will estimate the vehicle trip reduction impacts of various combinations of transportation demand management (TDM) on reducing vehicle trips.

II. Project Abstract

Transportation engineers and urban planners rely on the Institute of Transportation Engineers' Trip Generation Manual and the Parking Generation Manual to estimate the traffic impact and parking needs of new developments.  These estimates drive public policy regarding growth and development.  The trip generation estimates predict the traffic volumes of these development proposals and decisions regarding developer provided improvements are tied to these estimates. The link between development and available capacity is especially in areas with insufficient roadway "supply" to absorb the new development without degrading the level of service. The parking manual is used to establish minimum parking requirements.  What are missing are modifications to the demand side of the equation.    How would worksite trip reduction programs reduce the estimated number of vehicle trips?  This project proposes to compile the thousands of worksite trip reduction plans that have been developed and tracked for several years from a few urban areas in the country.  

The project will focus on updating the data from the three cities that participated in 1997 with the development of the FDOT Research Center-funded project to develop software to predict worksite trip reduction impacts based on programs, incentives and disincentives provided by the employer.  The update also will investigate the availability of additional data sets.  From this model, a Worksite Trip Reduction Manual will be produced.

III. Task Descriptions

Task 1:  Literature Review and Site Visits  

A review of the current worksite trip reduction programs, including Rule 2202 in Los Angeles, Commute Trip Reduction law in the State of Washington, and the air quality based trip reduction requirements in the Phoenix and Tucson areas, will be conducted.  Site visits may be arranged at existing worksite trip reduction programs in the United States to explain the project, view data handling procedures, and seek their cooperation with the sharing of data for the development of the worksite trip reduction manual and model. A description of data issues and operational difficulties encountered in the development of these types of projects will be prepared.

Task 2: Acquire and Compile Worksite Trip Reduction Data. 

Using the results of Task 1, the research team will acquire and compile the data in a similar format for analysis.  

Task 3: Model development and validation.  

Using various modeling techniques, a model will be developed to predict the impacts of worksite trip reduction programs.  The research team will validate the model with a subset of the data not used to build the model.  NCTR Researchers will develop the Worksite Trip Reduction Manual will be as a standalone product.

Task 4: Review Worksite Trip Reduction Manual and Model   

FDOT and peer reviewers will review and comment on the worksite trip reduction modal and manual.

Task 5: Final manual and model.  

NCTR researchers will provide final versions the manual and model.  NCTR researchers will provide ten (10) copies of the manual and model to FDOT's central office.

 IV. Student Involvement

Graduate students will be used in the collection and compilation of data into a common format.  They will assist in the development of the model and validation as well as the user interface design. 

V. Relationship to Other Research Projects

The project would involve a literature review of current worksite trip reduction models including the TDM Model and the COMMUTER model particularly in the United States. FHWA is moving toward an update to the Employer Guidance Manual from the FHWA TDM Series and has interest in a manual method for projecting results.

VI. Technology Transfer Activities/Peer Review

NCTR researchers will participate in conferences such as the Institute of Transportation Engineers, the Association for Commuter Transportation, Transportation Research Board annual or mid-year conferences and other transportation conferences or workshops. As part of this project, NCTR researchers will make the model and manual available for download on the NCTR website.  NCTR researchers will notify known previous users of the CUTR_AVR model.  An announcement of its availability will be posted on the NCTR TDM listserv (currently reaching ~450 TDM professionals in Florida, U.S. and abroad).  In addition, NCTR research team will make a brief streaming video and PowerPoint presentation explaining the project for easy access on the Internet. Proposed peer reviewers for this project include Wayne Berman with FHWA, Eric Schreffler with ESTC and director of research for the Association for Commuter Transportation's TDM Institute, and Erik Herzog with EPA.  NCTR will invite additional reviewers from the industry, in particular those areas that provide the data from which the model is developed.

VII. Potential Benefits of the Project 

Developers, local communities, and the transportation system should benefit from this project. Quantifiable impacts of various mixes of worksite trip reduction plans will allow developers, local communities and transportation professionals to do the following:

  • Increase the development intensity without increase vehicle demand
  • Reduce the cost of constructing parking by decreasing the demand
  • Evaluate impacts of mixes of strategies rather than incremental changes
  • Reduce onsite traffic congestion by securing ongoing commitment by developers and employers to various worksite trip reduction strategies
  • Improve air quality by reducing the number of privately owned vehicles on the road 

VIII. TRB Keywords

Transportation demand management, trip reduction, congestion, Telework 


National Center for Transit Research at the Center For Urban Transportation Research University of South Florida 4202 E. Fowler Ave., CUT100 Tampa, FL 33620-5375 (813) 974-3120 (813) 974-5168 Comments: