SWZDI Home Projects Board of Directors Events


Status: Complete

Description: Improving freeway work zone traffic control could lead to more efficient traffic flow and greater safety to workers and the driving public. Newer technologies are being developed for improving work zone traffic control as in the case of dynamic speed advisory systems. Such systems have the potential to warn drivers of slow downs near work zones and streamline traffic approaching the work zone. An evaluation of a particular speed advisory system was conducted using multiple performance measures on I-70 in St. Louis, Missouri. The use of mean speed, speed variance, and driver surveys show that the system helped to improve the safety of the work zone. Data also show that static and dynamic operations of the system produced different effects on the traffic pattern. Time headways and conflict video were collected but were not useful in this particular evaluation.

Report: MwSWZDI-2003-Sun-Intellizone.pdf 1.2 mb (published 2003)

State conducting research: Missouri


  • Quixote/Hoosier


  • King, Tyson (University of Missouri, Columbia)
  • Sun, Carlos (University of Missouri, Columbia)
  • Virkler, Mark (University of Missouri, Columbia)

Related projects

Iowa State University does not discriminate on the basis of race, color, age, ethnicity, religion, national origin, pregnancy, sexual orientation, gender identity, genetic information, sex, marital status, disability, or status as a U.S. veteran. Inquiries regarding non-discrimination policies may be directed to Office of Equal Opportunity, Title IX/ADA Coordinator and Affirmative Action Officer, 3410 Beardshear Hall, 515 Morrill Road, Ames, Iowa 50011, Tel. 515 294-7612, Hotline: 515-294-1222, eooffice@iastate.edu.