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原文传递 Effects of Delineation Post Density on Vehicle Speed, Lateral Position and Driver Acceptance

题名：	Effects of Delineation Post Density on Vehicle Speed, Lateral Position and Driver Acceptance
作者：	Mahoney, K. M.; Porter, R. J.; Donnell, E. T.; Lee, D.; Pietrucha, M. T.
关键词：	Rumble strips##Two-lane roads##Evaluation##Highway safety##Centerline warnings##Highway design##Traffic safety##Traffic control devices##Road shoulders##Accident reduction##Comparison sites##Data analysis##Statistical data##Speed control##Lateral vehicle placement##Tapeswitches##
摘要：	Delineator posts are designed to help drivers detect the direction of the road, especially in the dark and in otherwise poor visibility. The regulations for delineator posts differ substantially between the Nordic countries in regard to both design and density. There are also differences in the criteria for delineator post placement, as summarized by Nygårdhs (2008). On straight roads, for example, the distance between posts varies between 50, 60 and 100 m depending on the regulation. Kallberg (1993) showed that delineator posts along a winding road with an 80 km/h speed limit actually create a greater risk of accident in the dark because the driver increases speed. On roads with good geometry, however, delineator posts seem to improve safety. There is also older evidence indicating that delineator posts do not always promote safety (see Nygårdhs 2008). In 2009, NMF commissioned a multi-stage research project with the main objective of delving into the delineator post issue. This would serve as a foundation for revising and perhaps harmonizing delineator post regulations in the Nordic countries. The project included a simulator study and a field study. In 2011–2012, the Swedish National Road and Transport Research Institute (VTI) conducted simulator measurements with different delineator post configurations (Lundkvist et al. 2013). The last phase of the simulator study comprised six delineator placement configurations: three currently in use in the Nordic countries and three new ones. Overall, the results indicated that some of the new configurations could be promising. Speeds were lower for configurations with fewer delineators. However, drivers seemed to prefer dense configurations. The road had a 9 m wide pavement and included both very sharp (radius 250 m) and gentle (radius 1,000 m) curves. Fourteen test drivers took part in this final phase.
总页数：	70
报告类型：	科技报告