MPC
Research Projects (2002-03)

Identifying Number

MPC-233

Project Title

Evaluate Effectiveness of Dilemma Zone Advanced Signal Warning

University

University of Utah

Project Investigator

Peter T. Martin
University of Utah
Salt Lake City, Utah
(801)581-7144
martin@civil.utah.edu

External Project Contact

N/A

Project Objective

A literature search will be conducted to determine the relative effectiveness of the different types of advance signal warning devices. Determine the effectiveness of the dilemma zone advance warning signal device. If appropriate develop guidelines with regard to the installation of dilemma zone advance warning devices. Give recommendations to standardize future installations.

Project Abstract

The Utah Department of Transportation has installed two dilemma zone advanced warning signal systems in the state. The locations of these systems are outside St. George and Brigham City. The systems alert drivers, with the use of flashing warning lights located at the dilemma zone. The lights begin flashing when the signal ahead is about to change phase from green to yellow to red. The two warning device systems were installed on high speed, low volume rural highways. Both systems were installed with the understanding that UDOT would evaluate the effectiveness of the systems. Currently, we have no standards with regard to when, how or what we will install with regard to advance signal warning devices. Before installing more, we need to determine effectiveness of the system and produce guidelines for future installation. Some of the measures of effectiveness would include reduction in accidents, decrease in red light running and reduction in speeds.

Task Descriptions

• Task 1 – Literature search of state-of-the-art and other state's practices.
• Task 2 – Field review of installations.
• Task 3 – Conduct a before and after installation study.
• Task 4 – Motorist interviews.
• Task 5 – Develop installation guidelines.
• Task 6 – Develop recommendations for standardizing installations.

Milestones, Dates

• Starting Date: July 1, 2002
• Project Milestones:
• Ending Date: June 30, 2003

Yearly and Total Budget

$35,000

Student Involvement

One graduate student will be supported for one year; One MS thesis.

Relationship to Other Research Projects

N/A

Technology Transfer Activities

Workshop; Publication in both peer reviewed and professional journals.

Potential Benefits of the Project

Consistency and uniformity in the installation of these devices. Increased safety through the effective use of these devices. Improved cost/benefit by only installing devices in locations and ways that they have a benefit.

TRB Keywords

Traffic management, traffic signal systems