Evaluation of Alternative Work Zone Signing, August 2017

(2017) Evaluation of Alternative Work Zone Signing, August 2017. Transportation, Department of

Final Report_alternative_work_zone_signing_eval_w_cvr.pdf

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Many work zones require lane closures, and road users need to be notified of these closures through appropriate upstream signage. A literature review prepared for this study found several previous investigations indicating insufficient comprehension of the U.S. standard lane closure sign and similar signs used internationally. The W4-2 sign is also unsuitable for signing interior lane closures on roadways with three or more lanes. Driver comprehension of several alternative sign faces was tested through a survey using the ANSI Z535.3 process and was followed by a driving simulator study. The driver comprehension survey suggests that an Upward Drop Arrow design is a promising alternative to the existing W4-2 sign for its sites where two upstream lanes are reduced to one lane in the work zone. In addition, one-arrow-per-lane signs developed as Americanized versions of the Vienna Convention G12a sign template are a promising option for interior lane closures on multi-lane roadway segments. A driving simulator study compared the W4-2, a MERGE text sign with a horizontal arrow, and an Americanized version of the Vienna Convention G12a sign. In terms of sign comprehension, the W4-2 was the least understood of the three signs. The W4-2 resulted in more late merge maneuvers than the other two signs. Field evaluation of the Upward Drop Arrow and Americanized G12a signs is recommended as a follow-up to this study.

Item Type: Departmental Report
Keywords: alternative sign survey—crash mitigation—driving simulator study—lane closure signs—merging control—traffic control devices—work zone safety
Subjects: Transportation
Transportation > Roads and highways
Transportation > Traffic safety > Work zones
ID Code: 27269
Deposited By: Hannah Gehring
Deposited On: 16 Apr 2018 12:23
Last Modified: 16 Apr 2018 12:23
URI: https://publications.iowa.gov/id/eprint/27269