Design Guidelines for Mitigating Collisions with Trees and Utility Poles (2022) / Chapter Skim
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7 Trees and utility poles are the roadside objects most likely to be struck in fatal and injury crashes involving vehicles that run off the road. As noted in Chapter 1, approximately 12% of traffic fatalities in the United States involve collisions with trees and utility poles.
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From page 8... ...
8 Design Guidelines for Mitigating Collisions with Trees and Utility Poles The FHWA Guide to Management of Roadside Trees presents detailed information on identifying and evaluating the potential for crashes in roadside environments; provides guidance for implementing roadside tree removal; and addresses environmental issues, alternative treatments, mitigation efforts, and maintenance practices (Ziegler et al.
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From page 9... ...
Crash Reduction Programs for Removing or Relocating Roadside Trees and Utility Poles 9 • If a tree, or group of trees, is in a vulnerable location but cannot be removed, a properly designed and installed traffic barrier can be used to shield it. Roadside barriers should be used only when the severity of striking the tree is greater than striking the barrier.
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From page 10... ...
10 Design Guidelines for Mitigating Collisions with Trees and Utility Poles Utility poles should be located where they are least likely to be struck. In some situations, it may be preferable to bury utility lines, thereby eliminating the poles as obstacles.
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From page 11... ...
Crash Reduction Programs for Removing or Relocating Roadside Trees and Utility Poles 11 Breakaway poles are designed to reduce crash severity rather than crash frequency. The designs shown in RDG Figure 4-14, consisting of a ground-level slip base and upper hinge assembly, have been successfully crash tested.
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