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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-58 NCHRP 350 Flexstake Sign Supports, Mailboxes, and Delineator Posts Flexible delineator posts
SS-57 NCHRP 350 Sign Supports, Mailboxes, and Delineator Posts Minuteman coupler on Triple 3ppf and 4ppf (w/soil plate on 4ppf),in all soils.
CC-26C NCHRP 350 Barrier Terminals and Crash Cushions Design change
SS-46A NCHRP 350 Sign Supports, Mailboxes, and Delineator Posts Dual Unmodified Cedar Posts full dimension 4"x6"
B-29B NCHRP 350 RAMCO Longitudinal Barriers and Bridge Rails Polylumber Blockouts on Steel Post W-beam
LS-42 NCHRP 350 P&K Pole Products Luminaire Supports SB-3G Cast Aluminum Call Box Base, 8.5" BC
LS-39 NCHRP 350 P&K Pole Products Luminaire Supports BA-3 Cast Al. Breakaway Base for 10" Poles, 15" BC
LS-40 NCHRP 350 P&K Pole Products Luminaire Supports TB-2CBA Cast Al.Transformer Base for 10" Poles, 15" BC
LS-43 NCHRP 350 P&K Pole Products Luminaire Supports SB-2g Cast Al. Shoe Base for Slotted Al. Shaft, 12" BC
LS-41 NCHRP 350 P&K Pole Products Luminaire Supports TB-2A Cast Aluminum Transformer Base, 15" BC