Effect of Flaggers and Spotters in Directing Work Zone Traffic for Illinois Expressways and Freeways

El-Rayes, Khaled; Liu, Liang; El-Gohary, Nora; Abdelmohsen, Ahmed Zafer

Permalink

https://hdl.handle.net/2142/46994 Copy

Description

Title

Effect of Flaggers and Spotters in Directing Work Zone Traffic for Illinois Expressways and Freeways

Author(s)

• El-Rayes, Khaled
• Liu, Liang
• El-Gohary, Nora
• Abdelmohsen, Ahmed Zafer

Issue Date

2014-01-17

Keyword(s)

• work zone
• flagger
• spotter
• safety
• mobility
• freeway
• expressway

Abstract

This research project focused on assessing the effectiveness and essential role of flaggers and spotters in directing traffic for expressway and freeway work zones in Illinois with a posted speed limit greater than 40 mph. The objectives of this project were to (1) conduct a comprehensive literature review to study the latest standards and research on the use of flaggers and spotters to direct work zone traffic on expressways and freeways; (2) perform site visits and field studies to evaluate flagger practices currently used in work zones in Illinois; (3) collect and fuse the latest data on work zone crashes in Illinois during a 14-year period from 1996 to 2009 from all available sources; (4) analyze the gathered data to study the frequency and severity of traffic-related work zone crashes in Illinois highways, and investigate the probable causes and contributing factors of these work zone crashes; (5) investigate the feasibility and effectiveness of work zone safety measures that can be used to supplement or replace the use of flaggers and/or spotters, such as intrusion alarm systems, portable changeable message signs, and portable speed monitoring displays; (6) conduct an online survey of resident engineers and construction personnel in the Illinois Department of Transportation (IDOT) and other state DOTs to gather their feedback on the essential roles and effectiveness of flaggers and spotters in directing work zone traffic for expressways and freeways; (7) identify the effectiveness and risks of using spotters and/or flaggers in work zones with a posted speed limit greater than 40 mph on Illinois expressways and freeways, and identify effective work zone safety measures that can be used to supplement or replace flaggers in these works zones; and (8) develop recommendations on the use of flaggers, spotters, and other safety measures in work zones with a posted speed limit greater than 40 mph on Illinois expressways and freeways. These recommendations can be used by IDOT to update and/or expand related IDOT policies, specifications, and standards in order to improve work zone safety and mobility.

Publisher

Illinois Center for Transportation

Series/Report Name or Number

ICT-14-001; UILU-ENG-2014-2001

ISSN

0197-9191

Type of Resource

text

Language

en

Permalink

http://hdl.handle.net/2142/46994

Sponsor(s)/Grant Number(s)

Illinois Department of Transportation, R27-109

Copyright and License Information

No restrictions. This document is available to the public through the National Technical Information Service, Springfield, Virginia 22161

Owning Collections