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  Roadway Departure Safety
                Strategic Approach
                Keep Vehicles on the Road
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                Reduce Crash Severity
                Focus on Reducing Rural Roadway Departures (FoRRRwD)
                
                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.SearchHardware Type
                    
- Any -Barrier Terminals and Crash CushionsLongitudinal Barriers and Bridge RailsLuminaire SupportsSign Supports, Mailboxes, and Delineator PostsWork Zone DevicesStart DateEnd Date
    Letter
																								Date
																								Testing
																								ManufacturerSort ascending
																								Hardware Type
																								Device DescriptionSS-24A
																																				October 22, 1997
																																				NCHRP 350
																																				Xcessories Squared
																																				Sign Supports, Mailboxes, and Delineator Posts
																																				Reference Xcessories Squared as the manufacturer.SS-175
																																				May 4, 2012
																																				NCHRP 350
																																				Xcessories Squared
																																				Sign Supports, Mailboxes, and Delineator Posts
																																				Surface Mount Slip Bases SMSB10-10-G and SMSB8-10-GSS-38A
																																				October 22, 1997
																																				NCHRP 350
																																				Xcessories Squared
																																				Sign Supports, Mailboxes, and Delineator Posts
																																				Reference Xcessories Squared as the ManufacturerSS-68D
																																				February 22, 1999
																																				NCHRP 350
																																				X-Cessories Squared
																																				Sign Supports, Mailboxes, and Delineator Posts
																																				3-bolt slip base, 10-inch varietySS-68C
																																				October 22, 1997
																																				NCHRP 350
																																				X-Cessories Squared
																																				Sign Supports, Mailboxes, and Delineator Posts
																																				3-bolt slip base for perf. square steel posts. Accepted previously via SS-52 on 2/8/65 under different nameSS-68B
																																				October 7, 1997
																																				NCHRP 350
																																				X-Cessories Squared
																																				Sign Supports, Mailboxes, and Delineator Posts
																																				Slip Base for Retrofit Square Steel Tube PostsSS-68A
																																				December 20, 1996
																																				NCHRP 350
																																				X-Cessories Squared
																																				Sign Supports, Mailboxes, and Delineator Posts
																																				Slip Base, Triple Square supports in Standard soilSS-68
																																				September 18, 1996
																																				NCHRP 350
																																				X-Cessories Squared
																																				Sign Supports, Mailboxes, and Delineator Posts
																																				Slip Base (8-inch) for Square Steel Tube posts **WZ-148
																																				March 21, 2003
																																				NCHRP 350
																																				X-Cessories Squared
																																				Work Zone Devices
																																				Revision to Type III Barricade from WZ-51B-37
																																				July 1, 1996
																																				NCHRP 350
																																				Wyoming DOT
																																				Longitudinal Barriers and Bridge Rails
																																				DOT 2 Bridge Railings (Steel Post & Rail w/ Curb)
(TL-3 and TL-4)
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