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Bullnose Questions

Question
State MO
Description Text

See attached for questions.

Keywords
  • End Treatments & Crash Cushions
Other Keywords none
Date June 14, 2006
Attachment Bullnose.pdf


Response
Response

I have looked at your bullnose barrier question regarding the distance from the nose of the system to the hazard. Based on a somewhat less conservative approach than our original guidelines, we believe you can reduce the 69.5' minimum distance shown in your drawing to 50'. We do not recommend that you shorten the distance any more than that as it may allow larger vehicles impacting the end of the system to impact your sign supports with significant velocity. The new 50' distance should shorten your installation 19.5' on the narrow side of your median.

 

As for your second question regarding the red area in your drawings, I am afraid I do not understand. The red area in your drawing is not a critical number. The critical number is the distance from the nose of the system to the rigid hazard. This distance is based on the amount of system deflection we saw in tests of a pickup truck impacting the end of the barrier system under NCHRP Report 350 impact conditions. We do believe that this distance can be safely reduced to 50' if need be as stated above.

Date June 19, 2006


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