I have looked at the details that you sent and have concerns over the function of the shielding of the pole outside of the allowable deflection.
As it is laid out in your detail, the signal pole is directly adjacent to the end anchorage for the thrie beam. Vehicle impacts in that area would likely release the end anchor through fracture of the BCT and allow the vehicle to impact the pole with little appreciable drop in velocity. Thus, shielding of the pole in this manner may not be effective.
That leaves a variety of options.
1. Moving the pole upstream of the end of the thrie beam and away from the anchorage may help somewhat, but the longitudinal offset may not be allowable based on where the signal needs to be placed.
2. Offsetting the pole more laterally may be the simplest answer, but I don’t know what space restrictions you have for lateral offset. A pole with an L-shaped top that allows the pole offset to increase while maintaining signal position might be an option too, but I don’t know if such an option exists.
3. A more effective post shielding could be done using a short concrete parapet with a TL-2 AGT and end terminal. This may increase the system length, but it would alleviate concerns for interaction with the signal pole.
4. Install a breakaway base on the pole to make the signal similar to a breakaway luminaire pole.
Take a look at these options and let me know what you think. I may have missed something.
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