We have had a lot of question about guardrail over large culverts adjacent driveways or roadways. With the close proximity of the roadways, our standard nesting system is too long. We are in the process of possibly moving toward the MGS system but are still showing strong post guardrail with an 8" blockout in our standard drawings. Could you recommend a good connection system for culvert mounted strong post guardrail? Would it still be an option to use the SRG05 Culvert Mounted W-Beam Guardrail in the Guide to Standardized Highway Barrier Hardware, see attached.
I also have one other question, a lot of designers have proposed to just cross these large culverts with our modified post that we use in our nested guardrail system, see attached standard drawing sheets. We believe these modified post should only be used as part of a system, modified posts (E 601-NWGA-03, attached) should be proceeded and followed by 4-6'-0" length steel posts w/routed wood blockouts (E 601-NWGA-01 and -02, attached). They should not stand alone. Do you know of any mounted post systems that are similar to our nested guardrail modified post that can stand along over a bridge?
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