Updated minimum retroreflectivity levels for traffic signs.

Description

Main Author

Carlson, Paul J. (Paul John), 1969-

Related Names

Hawkins, H. Gene.

Language(s)

English

Published

2003.

Subjects

Standardization.
Signs.
Reflectivity.
Night.
Highway safety.
Design.
Absorptivity.
Signs/ Signals.
Sign Design.
Reflectance/ Absorptivity/ Reflectivity.
Nighttime.
Highway Safety Program Standards.

Summary

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.
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 midto 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.

Physical Description

101 p. :.

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