TY  - JOUR
PY  - 2020//
TI  - Assessing the visibility of raised pavement markers and alternative forms of delineation
JO  - Transport
A1  - Bullough, John D.
A1  - Liu, Xiang
SP  - 98
EP  - 107
VL  - 35
IS  - 1
N2  - Raised Pavement Markers (RPMs) are used by a number of transportation agencies with the objective of improving roadway safety, especially in complex roadway geometries and along wet roads. Because of maintenance and cost issues, many transportation agencies are exploring alternatives to RPMs such as wet reflective pavement tape and barrier-mounted reflective delineators. In order to assess the relative potential of these devices to contribute to nighttime driving safety, the luminances of new and used RPM samples from different manufacturers and having different colors and of several alternative delineation devices were measured in the laboratory using a range of geometric conditions relevant to the driving task. From these data, Luminances under representative low-beam headlight illumination were determined and these quantities were used to estimate driver visual performance. Large variations in luminance yielded relatively small differences in visual performance for a viewing distance of 100 m, primarily because of the plateau characteristic of visual performance. Differences in threshold visibility distances were greater, with distances at identification threshold for the devices measured ranging approximately from 150 to 400 m. Used RPMs had luminances 20…30% lower than new RPMs but similar visibility characteristics as new devices. The analysis method in this study may be useful for practitioners seeking to characterize the visual effectiveness of RPMs and other roadway delineation devices and systems.   													Keyword :   																											visual performance,   																			pavement markings,   																			roadway delineators,   																			visibility distance,   																			retroreflectivity  																								  						  													  								How to Cite  								  									  										    Bullough, J. D., & Liu, X. (2020). Assessing the visibility of raised pavement markers and alternative forms of delineation. Transport, 35(1), 98-107. https://doi.org/10.3846/transport.2020.12072    									  									  										  											More Citation Formats  											  										  										  																							  													  														ACM  													  												  																							  													  														ACS  													  												  																							  													  														APA  													  												  																							  													  														ABNT  													  												  																							  													  														Chicago  													  												  																							  													  														Harvard  													  												  																							  													  														IEEE  													  												  																							  													  														MLA  													  												  																							  													  														Turabian  													  												  																							  													  														Vancouver<p />  <p>Language: en</p>
LA  - en
SN  - 1648-4142
UR  - http://dx.doi.org/10.3846/transport.2020.12072
ID  - ref1
ER  -