SWZDI Home Projects Board of Directors Events

Asset Management Strategies to Mitigate Freeway WZ Congestion

Status: Complete

Description: Traffic volume increases and an aging infrastructure create the need for reconstruction, rehabilitation, and maintenance of existing facilities. As more motorists feel that delays should be minimal during highway renewal projects, lane closures that reduce capacity through the work zone should not create unreasonable delays. In order to facilitate the determination of when a lane closure is permitted during the day, some state transportation agencies (STAs) have developed lane closure policies, or strategies, that they use as guidance in determining daily permitted lane closure times. Permitted lane closure times define what times of the day, week, or season a lane closure is allowed on a facility and at a specific location or segment.

This research addresses the lane closure policies of several STAs that were reputed to have good lane closures policies or strategies and that were selected by the project advisory committee for further research. These agencies include the following: --California Department of Transportation (Caltrans) --Colorado Department of Transportation (CDOT), Region 1 and Region 6 --Indiana Department of Transportation (INDOT) --Minnesota Department of Transportation (Mn/DOT), Metropolitan District --Missouri Department of Transportation (MoDOT) --Ohio Department of Transportation (ODOT) --Wisconsin Department of Transportation (WisDOT)

A survey was sent to each STA to help determine its actions with respect to the undocumented mechanics of the policy and to find some common ground for policy comparison.

Report: 2007-maze-lane_closure.pdf 987 kb (published 2007)

Other Document: Optimizing Work Zone Road Closure Capacity 305 kb *pdf

State conducting research: Iowa


  • None


  • Maze, Tom (Iowa State University)
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.