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FHWA Highway Safety Programs

Archived Hardware Eligibility Letters – NCHRP 350

These letters are archived and are posted for "historical and research purposes only" per the sunset dates in the AASHTO/FHWA Joint Implementation Agreement and exceptions to these dates as posted on the AASHTO Committee on Design website.

Letter Date Testing Manufacturer Hardware Type Device Description
SS-68 NCHRP 350 X-Cessories Squared Sign Supports, Mailboxes, and Delineator Posts Slip Base (8-inch) for Square Steel Tube posts **
SS-67 NCHRP 350 Franklin Industries Sign Supports, Mailboxes, and Delineator Posts 60 KSI U-Channel Posts recertification
SS-65 NCHRP 350 Southwestern Pipe Sign Supports, Mailboxes, and Delineator Posts Poz-Loc Slip Base**
B-38 NCHRP 350 Connecticut DOT Longitudinal Barriers and Bridge Rails Merritt Parkway Guiderail (Aesthetic) TL-3
CC-36 NCHRP 350 J. Carney Barrier Terminals and Crash Cushions Vanderbilt TMA @ TL-2
SS-66 NCHRP 350 HwyCom Sign Supports, Mailboxes, and Delineator Posts Universal Anchor System for FRP & Poz Loc Posts
SS-64 NCHRP 350 Marion Steel Sign Supports, Mailboxes, and Delineator Posts Metric "Rib-Bak 2" Posts
SS-56B NCHRP 350 Marion Steel Company Sign Supports, Mailboxes, and Delineator Posts Redesigned Rib-Bak
SS-57A NCHRP 350 Marion Steel Company Sign Supports, Mailboxes, and Delineator Posts Redesigned Rib-Bak
SS-05A Marion Steel Company Sign Supports, Mailboxes, and Delineator Posts Redesigned Rib-Bak