Request For Proposals Are Invited For Update To Aashto M 180 18 And Associated Highway Guardrail Specifications Many States Use Aashto And Astm Standard Specifications For Their Guardrail Components Changes To The State Of Practice And To Guardrail Materials Have Created A Need To Revise Aashto Standard Specification M 180 18 Corrugated Sheet Steel Beams For Highway Guardrail And Its Associated Material Standards Including Those Referenced In M 180 18 A Lack Of Consistent Standards Can Increase Fabrication Costs For Hardware Suppliers And Ultimately Transportation Agencies A Manufacturer Can Spend A Significant Amount Of Resources Matching One StateS Standards Only To Start Completely Over To Match Another StateS Standards Consistency Of Specifications Will Also Help To Increase Competition Allowing For The Possibility Of Lower Hardware Costs For Transportation Agencies Some Examples Of Developments In Materials And The State Of Practice For Highway Guardrail Systems That Are Not Currently Addressed By Aashto M 180 18 Are The Asymmetrical W Beam To Thrie Beam Transition Section That Has Been In Use For A Number Of Years Inconsistency In The Material Requirements For Thrie Beam Terminal Transitions And Connections Use Of High Strength Steel Bolts Connecting Thrie Beam Terminal Connectors To Rigid Barrier Multiple Slot Patterns For Thrie Beam Terminal Connectors Thrie Beam And W Beam Rails Lack Of Consistent Markings For Components Of The Highway Guardrail System Changes To The Applicable Locations And Geometric Equivalents For Astm Standard Bolts Use Of Multiple Grades For Steel Posts Lack Of Guidance For Shop Bent W Beam Or Thrie Beam Rails E G Longitudinal Radius Of Curve Radius Tolerances Marking Of Beam Radius To Aid Maintenance Etc Lack Of Changes To The Appropriate Dimensions And Tolerances Metric And Inch For Holes In Steel Guardrails And Posts Lack Of Inclusion Of Anchor Wire Rope Standards In Aashto M 180 18 Lack Of Standards For Swage Fittings Changes To Bolt Tolerance Shape And Torque Requirements Lack Of Paint And Thermal Spray Specifications For Guardrail Beams And Posts To Meet The Requirements For Type Iii Guardrails Implications Of The Greater Longevity Of Painted Weathering Steels Compared To Ordinary Carbon Steels Need For Specifications For Stainless Steel Beams Posts And Bolting To Meet The Requirements For Type Iv Guardrails
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