Updated Minimum Retroreflectivity Levels

Carlson, Paul J.; Hawkins, Jr., H. Gene

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Updated Minimum Retroreflectivity Levels

2003-07-01
By Carlson, Paul J. ; Hawkins, Jr., H. Gene

File Language:

English

Details

Creators:

Carlson, Paul J. ; Hawkins, Jr., H. Gene
Corporate Creators:

United States. Department of Transportation. Federal Highway Administration. Office of Safety
Contributors:

Opiela, Kenneth S.
Corporate Contributors:

Turner-Fairbank Highway Research Center
Subject/TRT Terms:
Publication/ Report Number:

FHWA-RD-03-081
Resource Type:

Tech Report
Geographical Coverage:

United States
Contracting Officer:

Opiela, Kenneth S.
Corporate Publisher:

United States. Department of Transportation. Federal Highway Administration. Office of Safety
Abstract:

The development of minimum retroreflectivity (MR) levels for traffic signs has been going on for more than two decades, but it was significantly accelerated in 1984 when the Center for Auto Safety petitioned the Federal Highway Administration (FHWA) to establish retroreflectivity standards. During the past decade, several sets of recommended MR levels for traffic signs have been proposed. However, these preliminary recommendations have been based on a headlamp-beam pattern that represents vehicle design from the mid- to late-1980s. Vehicle headlamps have changed significantly since then. Other significant changes also have prompted the need to update the recommended MR levels for traffic signs before FHWA initiates the rulemaking process. This report includes an updated set of recommended MR levels for traffic signs based on recent developments in vehicle headlamps, vehicle types/sizes, nighttime driver needs, and newer sheeting materials. The updated MR levels are also based on more robust computer modeling of retroreflective sheeting performance.
Format:

PDF
Funding:

DTFH61-01-C-00182/ WO BA82B004
Download URL:

https://rosap.ntl.bts.gov/view/dot/40968/dot_40968_DS1.pdf
File Type:

[PDF - 836.15 KB]
Collection(s):

Federal Highway Administration
Main Document Checksum:

urn:sha-512:a291ae1e665b78efd51008904b9544968b08846ae48737f54604b62d6c3fb9951bb6504eca00b0ed9c4c9d663800b6fcbb28b07b4f6888236f6c266d4ad1330c

File Language:

English

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