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Short Radius Questions

Question
State WI
Description Text Here are some questions I have about the short radius.

When we indicate that there is a radius in our plans, how accurate should be the radius (nearest ft, 2 ft 5 ft quarter of an inch)?

As I look at the FHWA drawings, it appears that there are two cables shown. One being 9’ long and no information about the other cable.

1. Am I looking at this wrong?
2. Is the other cable just a standard BCT cable (see attached)? I have done some searching around and have not had much luck in finding that cable labeled.

Keywords
  • Bullnose Median Barrier & Short Radius
Other Keywords none
Date October 19, 2015
Attachment cable barrier question.pdf


Response
Response

(1)    Radii accuracy are dependent on construction tolerance etc. There is some leeway for radii between 8 and 16 ft, but whatever leeway you give you will end up stretching the rail a bit if the radius isn’t close because you won’t get the rail to exactly 90 degree turn. I think your tolerance is more on your rail curvature, so the total radius tolerance might be nearest foot, maybe less.

(2)    The second cable he described is a normal BCT cable.

Date October 19, 2015


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