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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 Sort ascending Testing Manufacturer Hardware Type Device Description
SS-31 NCHRP 350 Allied Tube and Conduit Sign Supports, Mailboxes, and Delineator Posts Single Perforated Square Steel Tube 2 ½" 12 ga in 7 ga anchor
CC-17 NCHRP 350 Roadway Safety Service Barrier Terminals and Crash Cushions FITCH Sand Barrel Attenuator with "Zip-Strip" Connectors and "Unicore" Sand Support Structure
SS-30A NCHRP 350 Hapco Division Sign Supports, Mailboxes, and Delineator Posts Extend range of pole heights and correct aluminum spec called for in SS-30
SS-30 NCHRP 350 Hapco Division Sign Supports, Mailboxes, and Delineator Posts Cast Aluminum Shoe Base for Motorist Aid Call box Supports
LS-27A NCHRP 350 Hapco Division Luminaire Supports Change in handhole dimensions
B-20 NCHRP 350 Mobil Chemical Company "Timbrex" Longitudinal Barriers and Bridge Rails Recycled Blockouts for use on Wood Strong-Post W-Beam Guardrail
LS-28 NCHRP 350 Adian Engineering Luminaire Supports Adian Breakaway Base for Luminaire Supports Model TB-01, 16" to 17" B
LS-27 NCHRP 350 Hapco Division Luminaire Supports Breakaway Aluminum Shoe Base, 11" BC
SS-29 NCHRP 350 A.B. Chance Sign Supports, Mailboxes, and Delineator Posts Helical Screw Foundations for Motorist Aid Call boxes
LS-26 NCHRP 350 Sherman International Luminaire Supports Direct Burial Breakaway Fiberglass Luminaire Supports