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Cable Median Barrier Guidelines.
| 题名： | Cable Median Barrier Guidelines. |
| 关键词： | barrier；median；guide；cable；lines；elin；application；characteristics；effectiveness；development |
| 摘要： | Caltrans has led the way in the analysis of median barrier effectiveness and development of guidelines for median barrier implementation. Caltrans began studying median related accidents in the 1950s by comparing the accident histories of flat traversable medians to those from deterring medians with ditches, berms, or barriers. These studies led Caltrans to begin conducting before and after studies of highways where median barriers were installed. Caltrans used the findings from these before and after studies to develop the first guidelines for the application of median barriers. Due to the relatively low frequency of cross-median crashes, the accident data was insufficient to consider any characteristics beyond median width and traffic volume. These width-volume guidelines were eventually adapted for nationwide application and, with only minor changes, were employed from the 1970s through the 1990s. |
| 报告类型： | 科技报告 |
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