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This study examines safety in the presence of large trees in curbed medians of conventional highways that are also principal streets in developed urban and suburban areas. Statistical modeling methods were used to associate collision frequency and severity with highway and traffic characteristics, with and without median trees. The methods include simple accident rates and three types of multivariate modeling and use collision data for 6 years.
The overall conclusion is that large trees in medians of major conventional urban and suburban highways of state jurisdiction are associated with more collisions and increased severity. However, some of these associations are statistically weak. For the situations examined, lower speeds and larger side clearances were not found to mitigate the increased collision impacts associated with median trees.
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More Information: https://commerce.metapress.com/content/y66043008325385r/resource-secured/?target=fulltext.pdf&sid=440c4d55coe1q4upgibzc055&sh=trb.metapress.com
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