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Abstract:In order to determine the severity of collisions with the types of supports presently in use, a "state-of-the-art" investigation was initiated as an objective of this research. Rowan and Kanak have reported the results of 12 full-scale crash tests on six different combinations of supports and bases. This study revealed the severity of accident that can be expected with the supports and bases tested. The tests showed that the type of base that would break away under the impact of a colliding vehicle produced the least severe collision. Furthermore, it was demonstrated that in collisions involving breakaway base supports the low-speed impact presented the most concern. This concern is of the secondary collision of the support post with the vehicle, which occurred only at low speeds" The severity of this secondary collision was minor, however, when compared with the primary collision with a fixed base support. The researchers found that an additional input was required to fully explore the concept of break-away luminaire supports. A technique was needed which could be used to evaluate the effects of the various support parameters on the motion of the support. Consequently, a mathematical model was formulated and verified which could be used to predict the support post trajectory. Texas Transportation Institute Research Report 75-9 documents this phase of the project.
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