Crash tests were conducted to determine the impact behavior of median-mounted luminaire supports and secondary collisions of vehicles striking downed poles on a traffic lane. A relative hazard index was developed to describe the relative hazard created by the proximity and frequency of luminaire supports. It was concluded that a 20 degree impact by a 2900 lb vehicle at 45 mph would not cause a pole to encroach on the opposing traffic lane if the median is 40 ft. wide. A 4000 lb vehicle impacting at 25 degrees and 70 mph would cause a pole to encroach approximately 11 ft. into the opposing lane. Under both conditions, the impacting vehicle would cross into the opposing lanes and may be more of a hazard than the poles themselves. A medium size vehicle impacting a downed pole within the traffic lane presents no more hazard than the original impact. From a relative hazard standpoint, median-mounted luminaire systems produce less hazard than house-side systems for median widths of 30 ft. or greater. (Author)
Evaluation of Breakaway Lightpoles for Use in Highway Medians
1972
62 pages
Report
Keine Angabe
Englisch
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