01099300

Component

In 2003, the Federal Highway Administration (FHWA) published research recommendations for minimum maintained retroreflectivity (MR) levels for traffic signs. The recommendations included most sign types but not white on blue signs or white on brown signs. In addition, the 2003 recommended maintained retroreflectivity levels were based on conditions representing dark rural environments. This report describes the research activities and consequent findings related to the development of recommendations for MR levels for white on blue signs and white on brown signs. This report also includes an investigation related to MR levels needed for complex visual conditions that include glare from on-coming headlamps and fixed roadway lighting. The research used a summary of the pertinent literature to develop an experimental plan to produce luminance thresholds that could be used with a previously developed analytical model to develop a set of recommendations for MR levels for white on blue signs and white on brown signs. The results for the white on blue signs and the white on brown signs were integrated into one table that includes the current set of MR levels. Both legend and symbol signs were consolidated into the same recommendations because of similar requirements for luminance thresholds.

01084478

08-0717

English

16p

2008

Transportation Research Board 87th Annual Meeting

DVD

Figures (2) ; References (5) ; Tables (9)

Glare; Headlamps; Operations; Reflectivity; Retroreflectivity; Street lighting; Traffic control devices; Traffic signal control systems; Traffic signs

Headlamp illuminance

Administration and Management; Highways; Operations and Traffic Management; Safety and Human Factors; I73: Traffic Control; I85: Safety Devices used in Transport Infrastructure

Transportation Research Board Annual Meeting 2008 Paper #08-0717

TRIS, TRB

Jan 29 2008 3:03PM