Deployment of a dilemma zone protection system reduced the maximum length of the dilemma zone by 30 percent at a rural intersection in Maryland.
Improved dilemma zone protection system deployed at two rural intersections in Maryland.
Made Public Date
01/03/2018

844

Locust Point Rd & MD-213
Elkton
Maryland
United States

845

Western Maryland Pkwy & US-40
Hagerstown
Maryland
United States
Identifier
2017-01212
TwitterLinkedInFacebook

Intelligent Dilemma Zone Protection System at High-Speed Intersections

Summary Information

Drivers’ actions in an intersection’s dilemma zone, the area where the decision to stop at a yellow light or continue through it is not clear-cut, can lead to side-angle and rear-end crashes. In Maryland, researchers developed an intelligent dilemma zone protection system (DZPS) to reducing these crashes by anticipating drivers’ decisions and responding.

Methodology

The DPZS system was deployed at two high-speed rural intersections (US-40 at Western Maryland Parkway in Hagerstown, MD and MD-213 at Williams/Locust Point Road in Elkton, MD) and has three components: (1) two wide-range sensors to track speeds and locations of all vehicles within the identified dilemma zones; (2) software to predict the response of drivers during the yellow phase and to activate the all-red extension function if needed; and (3) a web-based module for engineers/technicians to monitor the system’s performance from a control center. Field evaluations of the deployed DZPS were conducted about one month after the system activation dates, and real-time system monitoring and performance analysis was carried out with respect to the traffic flow characteristics impacts and the all-red extension activations.

Findings

The maximum length of the dilemma zone was reduced by 960 to 670 feet (vehicles traveling at 75 mi/h), a 30 percent reduction, at the intersection of US 40 and Western Maryland Parkway. The total length of dilemma zones weighted by traffic volume in each speed bin (increments of 5 mi/h from 25 mi/h to 75 mi/h), a 40 percent reduction, from 73 feet to 44 feet. Similar reductions were noted at the intersection of MD 213 and Williams/Locust Point Road.

Intelligent Dilemma Zone Protection System at High-Speed Intersections

Intelligent Dilemma Zone Protection System at High-Speed Intersections
Publication Sort Date
07/01/2017
Author
Park, Sun Yoon; and Gang-Len Chang
Publisher
Maryland Department of Transportation State Highway Administration
Other Reference Number
MD-17-SHA/UM/3-32

(Our website has many links to other organizations. While we offer these electronic linkages for your convenience in accessing transportation-related information, please be aware that when you exit our website, the privacy and accessibility policies stated on our website may not be the same as that on other websites.)

Goal Areas
Deployment Locations