RETROREFLECTIVITY REQUIREMENTS FOR PAVEMENT MARKINGS

Auteur(s)
GRAHAM, JR KING, LE
Samenvatting

Subjective evaluations by 59 observers and quantitative measurements of in-place roadway markings were made in order to determine minimum field luminance and retroreflectivity levels for pavement markings. A minimum luminance value was also determined for the same observers through subjective evaluations and quantitative measurements under controlled and repeatable laboratory conditions. For the fieldtest, more than 90% of the subjects rated a marking retroreflectance of 93 mcd/sq m/lx as adequate or more than adequate for night conditions. More than 98% of the subjects rated all locations having a marking luminance of 3.84 Cd/sq m or greater as adequate or more thanadequate, corresponding to a measured retroreflectivity of 94 mcd/sq m/lx. For the laboratory study, more than 90% of the subjects rated the simulated markings with a luminance of 0.38 Cd/sq m as adequate or more than adequate. Subjects used in this research represented a relatively young population, and the study was conducted under theideal field conditions. It is likely that an older driver, operating in a real-world driving situation, would require a retroreflectivity value higher than 93 mcd/sq m/lx. This paper appears in transportation research record no. 1316, Visibility for roadways, airways, and seaways 1991: proceedings of a conference, july 25-26, 1990, washington, d.C.

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Publicatie

Bibliotheeknummer
I 851672 IRRD 9211
Uitgave

TRANSPORTATION RESEARCH RECORD WASHINGTON D.C. USA 0361-1981 SERIAL 1991-01-01 1316 PAG: 18-23 T5

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