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Modern poles are made to break away.
"Pole-SafeŽ Omni-Directional Breakaway Supports for Poles
Transpo's "Double Neck" Pole-SafeŽ breakaway support system is designed for poles located within roadside clear zones and other locations vulnerable to vehicular impacts. The primary component of the system is a high-strength coupling, designed to break away quickly and cleanly upon impact, thus saving lives and reducing property damage. Pole-SafeŽ couplings are omni-directional, meaning the system breaks away with consistent, predictable behavior, regardless of the vehicle's angle of impact.
Vehicle crash-tested in accordance with NCHRP Report 350, Pole-SafeŽ is approved for use on all FHWA funded projects. In addition to superior safety performance, Pole-SafeŽ provides high structural load-carrying capacity. Extensive finite element analysis and simulated wind-load testing has been used to optimize the system for maximum loading conditions.
Pole-SafeŽ is designed for use with the maximum allowable pole mass as specified by AASHTO. Pole-SafeŽ can be used on a large range of light pole sizes and configurations for increased safety and efficiency. The high-strength coupling design offers exceptional resistance to forces created by wind and dead loads. Independent fatigue testing has demonstrated that Pole-SafeŽ couplings are capable of withstanding more than two million loading cycles with no reduction in structural capacity. "
Last edited by group911@aol.co; 12-27-2011 at 11:46 AM..
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