A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
The objective of this study was to ascertain whether the employment of physical barriers within the highway median is effective in promoting highway safety. An uncontrolled before and after study of 54.2 miles of urban freeway in California was conducted to determine the effect of cable chain link barrier and double blocked-out metal beam barrier on accident experience. Cable barrier was installed on 26.6 miles and the beam barrier on the remaining 27.6 miles of the study section. The two types of barrier were not installed under comparable geometric design and volume conditions. For example, the beam barrier was used primarily on medians having a width of less than 16 feet whereas the cable barrier was installed where the median width exceeded 16 feet. Findings which warrant mention are as follows: median barriers were effective in preventing cross median accidents; fatal accidents were reduced at barrier locations; injury accidents and total accidents increased at barrier locations; accidents involving the median increased at barrier locations; cable barriers are expensive to maintain. If no cost of repair is recovered by the State from the party responsible for the damage, it requires 13 years for the added maintenance costs to counteract its initial lower construction costs in comparison to the beam barrier. (Author)
The objective of this study was to ascertain whether the employment of physical barriers within the highway median is effective in promoting highway safety. An uncontrolled before and after study of 54.2 miles of urban freeway in California was conducted to determine the effect of cable chain link barrier and double blocked-out metal beam barrier on accident experience. Cable barrier was installed on 26.6 miles and the beam barrier on the remaining 27.6 miles of the study section. The two types of barrier were not installed under comparable geometric design and volume conditions. For example, the beam barrier was used primarily on medians having a width of less than 16 feet whereas the cable barrier was installed where the median width exceeded 16 feet. Findings which warrant mention are as follows: median barriers were effective in preventing cross median accidents; fatal accidents were reduced at barrier locations; injury accidents and total accidents increased at barrier locations; accidents involving the median increased at barrier locations; cable barriers are expensive to maintain. If no cost of repair is recovered by the State from the party responsible for the damage, it requires 13 years for the added maintenance costs to counteract its initial lower construction costs in comparison to the beam barrier. (Author)
Effectiveness of Median Barriers
R. T. Johnson (author)
1964
44 pages
Report
No indication
English
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