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Q about the w-beam perpendicular to the lanes of traffic beyond the short radius.

Should the CRT posts be placed on the portion of the guardrail which is perpendicular to the traveled way within the clear zone?

Or can these be full strength posts?

The NDOR variation of the short radius guardrail system appears to be somewhat based on the original Yuma County (YC) curved barrier system that was crash tested and evaluated by SwRI researchers. In terms of CRT posts, it would be appropriate to carry out the CRT posts along the secondary length at least as far as utilized in the original YC crash testing program.

More recently, TTI researchers conducted an LS-DYNA analysis and investigation of a modified YC system according to the NCHRP Report No. 350 TL-2 impact conditions. Following this effort, the modified YC system was submitted to and accepted by FHWA. Copies of the acceptance letter and research report are attached.

At this time, neither the YC or modified YC designs have been adapted to 31" tall W-beam guardrail systems nor accepted by FHWA.