NTL Record

Title Minimum sign retroreflective guidelines : summary report
Record ID 11058
Source 4p.
Corporate Creator United States. Federal Highway Administration
Publisher United States. Federal Highway Administration
Publication Date 19970601
Language English
Abstract Retroreflective traffic control devices are designed to help offset the lack of visual cues in the nighttime driving environment. Currently, the Manual on Uniform Traffic Control Devices requires that signs be retroreflectorized, but no minimum in-service values are given for the level of retroreflectivity. Due to the degradation of retroreflective materials over the course of years, it is important to have a basis for knowing when to replace signs. A two-phased approach was taken in defining minimum retroreflectivity values for signs. Human factors requirements were considered, as well as economic implications in setting replacement values. This summary report describes the Federal Highway Administration's Computerized Analysis of Retroreflective Traffic Sign (CARTS) model and its use in developing proposed minimum sign retroreflectivity guideline values. Also described are a laboratory study and field evaluation of the values.
Rosap ID dot:3640
Rosap URL https://rosap.ntl.bts.gov/view/dot/3640
TRT Terms Retroreflectivity; Traffic control devices; Traffic signs; Night visibility; Guidelines; Human factors; Economic factors; Field studies; Mathematical models
General Subjects Manual on Uniform Traffic Control Devices
Classification NTL - SAFETY AND SECURITY - Highway Safety;
NTL - OPERATIONS AND TRAFFIC CONTROLS - Traffic Control Devices
Geographical
Coverage		 United States
TRIS Online
Accession No		 00814102
Report Number FHWA-RD-97-074
Resource type Manual
URL https://ntlrepository.blob.core.windows.net/lib/jpodocs/repts_te/2581.pdf
Alternative URL http://www.fhwa.dot.gov/publications/research/safety/humanfac/97074/index.cfm
Format PDF
Database NTL Digital Repository