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Work Zone Safety Information Clearinghouse

Library of Resources to Improve Roadway Work Zone Safety for All Roadway Users

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Merging Control

Lane-Based Dynamic Merge Control Strategy Based on Optimal Thresholds for Highway Work Zone Operations

Despite the potential effectiveness of the dynamic late merge (DLM) control, most existing DLM systems, based on static thresholds, cannot best perform under time-varying traffic conditions. This … [Read more...] about Lane-Based Dynamic Merge Control Strategy Based on Optimal Thresholds for Highway Work Zone Operations

Effectiveness of Dynamic Messaging on Driver Behavior for Late Merge Lane Road Closures

Efforts to improve safety and traffic flow through merge areas on high volume/high speed roadways have included early merge and late merge concepts and several studies of the effectiveness of these … [Read more...] about Effectiveness of Dynamic Messaging on Driver Behavior for Late Merge Lane Road Closures

Traffic Control Strategies for Congested Freeways and Work Zones

The primary objective of the research was to identify and evaluate effective ways of improving traffic operations and safety on congested freeways. There was particular interest in finding … [Read more...] about Traffic Control Strategies for Congested Freeways and Work Zones

Evaluation of Early Merge Static Work Zone Signing in Oklahoma

This research examined the safety and operational benefits of having traffic merge early into the open lane prior to a work zone merge area. A 2007 law in Oklahoma adopted the use of additional “STATE … [Read more...] about Evaluation of Early Merge Static Work Zone Signing in Oklahoma

Benefits of Using Intelligent Transportation Systems in Work Zones – A Summary Report

This study quantifies benefits of ITS deployments for work zone applications and also documents key lessons learned from previous experience. Agencies interested in deploying similar systems can … [Read more...] about Benefits of Using Intelligent Transportation Systems in Work Zones – A Summary Report

Dynamic Late Merge Control Concept for Work Zones on Rural Interstate Highways

Conventional traffic control plans for lane closures of rural interstate normally work well as long as congestion does not develop. However, when the traffic demand exceeds the capacity of the work … [Read more...] about Dynamic Late Merge Control Concept for Work Zones on Rural Interstate Highways

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Copyright © 2026 American Road & Transportation Builders Association (ARTBA). The National Work Zone Safety Information Clearinghouse is a project of the ARTBA Transportation Development Foundation. It is operated in cooperation with the U.S. Federal Highway Administration and Texas A&M Transportation Institute. | Copyright Statement · Privacy Policy · Disclaimer
American Road and Transportation Builders Association Transportation Development Foundation, American Road and Transportation Builders Association U.S. Department of Transportation Federal Highway Administration Texas A&M Transportation Institute