General Terminal Questions 1. What are the recommended grading details adjacent to guardrail terminals?
• Special grading is required around guardrail terminals to assure that field performance is similar to that observed during full-scale crash testing. Relative to the placement of the terminal, FHWA refers to this as Advance Grading, Adjacent Grading and Run-out Grading. Note that crash testing is normally conducted on flat and level ground and it is important to avoid installing terminals on or too near steep slopes. Relatively flat terrain is required in front of guardrail terminals in order to assure that vehicles are not vaulted into the air or diving into the ground when the terminal is struck. Further, modest slopes are utilized behind guardrail terminals in order to allow sufficient recovery areas for vehicles gating through the end treatment. The FHWA has developed guideline requirements based on engineering judgment for both tangent and flared terminals. See FHWA Memo titled “Supplemental Guidance for the Selection of W-Beam Barrier Terminals” dated November 17, 2005 and the a
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