Type 2B signal pedestals are not deemed frangible. However, that rating only tells part of the story.
Frangibility is not about how a support looks. It is about how it behaves under impact. If a support can shear, yield, or detach to reduce crash severity for a defined user, and it has been tested and accepted as such, it is classed as frangible. The one in this video is not deemed frangible, but speed and mass can make almost anything bend.
Austroads assigns a trauma index of 8.6 to traffic signal poles, and some will be more rigid than others [for example, mastarms].
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