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Evaluation of the Effectiveness of Converging Chevron Pavement Markings.
| 题名： | Evaluation of the Effectiveness of Converging Chevron Pavement Markings. |
| 关键词： | effectiveness；chevron；evaluation；mark；speed；tiles；analysis；mean；statistical；percent |
| 摘要： | Converging chevron pavement markings have recently seen rising interest in the United States as a means to reduce speeds at high-speed locations in a desire to improve safety performance. This report presents an investigation into the effectiveness of chevron markings in reducing vehicle speeds on two-lane freeway-to-freeway directional ramps in Atlanta, Georgia. The evaluation is based on a statistical comparison at pre-selected sites of speeds before and after the installation of the chevron markings. The analysis focuses on the impact of converging chevrons over the range of speed percentiles and on the mean speed. The analysis indicates that the chevrons had a minimal impact on vehicle speeds, with drivers adjusting back to their previous speeds as they acclimate to the treatment. The effect of the chevron's treatments on speed tended to be most pronounced immediately after the chevron implementation. However, by the ninth month after implementation the magnitude of the effect dropped to under 1 to 2 mph for the mean speed and most vehicle speed percentiles. While this result does not necessarily imply that the chevron treatment is not a meaningful safety treatment, any safety benefits are not likely to result from a general decrease in speeds. |
| 报告类型： | 科技报告 |
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