SWZDI Home Projects Board of Directors Events

Multiple Placement of Radar Speed Reporting Devices

Status: Complete

Description: The speed monitoring display (SMD) developed in the late 1970s is one of the promising technologies that have been successfully applied both in the U.S. and abroad. The SMD informs drivers of their speeds and thereby encourages them to slow down if they are traveling above the speed limit. The objective of the system is to reduce the speed of traffic and increase speed limit compliance.

The primary objective of this evaluation was to assess the long-term effectiveness of SMDs in long-term work zones on rural interstate highways. To achieve this goal, three SMDs were deployed in a work zone area on I-80 near Lincoln, Nebraska. The effectiveness of the system was studied over a period of five weeks.

The SMDs were found to be effective in lowering speeds and increasing the uniformity of speeds over a period of five weeks.

Report: MwSWZDI-2002-Pesti-Speed_Display.pdf 357 kb (published 2002)

State conducting research: Nebraska


  • Speed Measurement Labs


  • Pesti, Geza (University of Nebraska, Lincoln)
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.