Utilities and Roadside Safety (2004) / Chapter Skim
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Pages 53-62
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From page 53... ...
APPENDIX A Example of Recommended Guidelines for Utility Installations and Modifications Session on Highway Rights-of-Way: Safety in the Clear Zone and Utility Installations Don L
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44 Utilities and Roadside Safety not been recommended by the entity responsible for the roadway, Table 1 may be used as a guide. Note that the lateral distance values in Table 1 were taken directly or interpolated from the 1977 AASHTO Guide for Selecting, Locating, and Designing Traffic Barriers (1)
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Example of Recommended Guidelines for Utility Installations and Modifications 45 poles with cross-arm structures, it is usually necessary to place the pole inside the right-ofway line to prevent the power lines from encroaching on private property. The presence of existing underground facilities, such as gas and water lines, may also preclude the placement of utility facilities at the right-of-way line.
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Safety measures can be divided into two approaches. The first approach is to reduce the probability of a vehicle collision.
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• The pole is not within a zone of significant pedestrian activity (as defined by benefit– cost considerations)
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48 Utilities and Roadside Safety Crash Cushions Crash cushions protect errant vehicles from impact with a rigid utility pole or luminaire support primarily by decelerating the errant vehicle in a controlled manner and bringing it to a relatively safe stop before the rigid pole is reached. As stated in the Barrier Guide, crash cushions "are used to shield rigid objects or hazardous conditions that cannot be removed, relocated or made breakaway." The use of a crash cushion may be determined on the basis of engineering judgment or a cost-effectiveness analysis.
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Example of Recommended Guidelines for Utility Installations and Modifications 49 that an inattentive or physically impaired driver might not be able to accurately perceive the lane drop or lane narrowing. These situations are presented in Figures 3 and 4.
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50 Utilities and Roadside Safety FIGURE 5 Inappropriate location of poles within a traffic island or median. If placement of a utility pole on an island is a practical necessity, consideration should be given to protecting errant vehicles with a crash cushion.
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Example of Recommended Guidelines for Utility Installations and Modifications 51 REFERENCES 1. Guide for Selecting, Locating, and Designing Traffic Barriers.
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10. New Guardrail End Treatment.
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