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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(link is external).

Letter Date Testing Manufacturer Hardware Type Device Description
WZ-03(b) NCHRP 350 TTI Report, Note 1 Work Zone Devices 1) Spring Mounted Sign Support with Plastic/Fabric Sign3 (see Figure II.1, "Figure 21")

2) Portable Sign Support with Plastic/Fabric Sign3, with flags added on top (see Figure II.2, "Figure 29")

3) D-4 Sign Trailer with Wooden sign Panel
(see Figure II.3, "Figure 33")

4) Skid Mounted Sign Support with Plywood Sign Panel (see Figure II.4, "Figure 37")

5) Perforated Steel Tube Type III Barricade with Plastic Panels (see Figure 11.5 "Figure 41" & "Figure 45")

6) Perforated Steel Tube Type III Barricade with 1x8 Wood Panels (see Figure 11.6 "Figure 42")

7) Schematic of Plastic Type III Barricade by Tex-Mex Barricade (see Figure II.7 "Figure 57")[this hardware may no longer be in production.]

8) Hollow Core Recycled Plastic Type III Barricade 4
(see Figure II.8 "Figure 61"
WZ-79 NCHRP 350 Alusuisse Composites Work Zone Devices Equivalence for Dibond and Alpolic.
WZ-03(g) NCHRP 350 Wyoming DOT Work Zone Devices Wood Type III Barricade (150-mm square wood horizontals and uprights, 3000-mm wide panels. See AASHTO Roadside Design Guide Figure 9.18. Mass of tested unit was 150 kg, not 725 as shown.)
WZ-03(d) NCHRP 350 Flasher Handling Work Zone Devices Air Spill Barricade. Flexible vertical panel fixed to a 44.5-mm wide, 1170-mm tall fiberglass support. Support is fixed to a low-profile rubber base.(See Figure II.18)
WZ-03(a) NCHRP 350 TTI for Texas D.O.T. Work Zone Devices TTI tested numerous work zone traffic control devices. All the devices listed here were successfully tested in these two crash test programs and met TL-3 criteria. The attached drawings illustrate the tested hardware but do not necessarily provide enough information to fabricate the device. The crash testing is fully documented in the two reports1,2 which should be consulted for additional details of the hardware
WZ-03(f) NCHRP 350 Nevada DOT Work Zone Devices Breakaway Type III Barricade (PVC Pipe, cable or rope through all pipes). See FHWA Implementation Package
IP 75-6 "Breakaway Barricades". See Figures II.19 and II.20 (Drawings A-8 & A-9) of the final designs.
WZ-03(c) NCHRP 350 TTI Report, Note 2 Work Zone Devices 1) Type III Hollow Core Plastic Barricade4 (see Figure II.9 "Figure 1.")(Vertical braces were added to support the panels prior to putting them in place on the barricade.)

2) Type III Perforated Tubing Barricade (3.7 m) (see Figure II.10 "Figure 2.")

(Vertical braces added, as noted above. Base connection detail also modified. Acceptable with 1x8 wood or hollow core plastic rails.)

3) Type III perforated Tubing Barricade (1.2 m) (see Figure II.11 "Figure 3.")

(Vertical braces added, as noted above. Base connection detail also modified. Acceptable with 1x8 wood or hollow core plastic rails.)

4) HwyCom Fiberglass Type III Barricade with plastic panels (see Figure II.12 "Figure 4.") (Round 76-mm diameter fiberglass pipes were used as the supports.)

5) Price Fiberglass Type III Barricade (see Figure II.13 "Figure 5.") (89 mm x 32 mm x 6.4 mm fiberglass U-channel supports were used.)

6) Spring-loaded Portable Sign Support (3) (see Figure II.14 "Figure 7") (Tested with mounting height of 610-mm.)

7) Ground-mounted Type III barricade (see Figure II.15 "Figure 8.") (Steel supports ground mounted in Poz-Loc sockets. Also acceptable with fiberglass supports in a "Universal" anchor, and with perf. square steel tubes in anchors.)

8) Vertical Panel Assembly (three shown in Figure II.16 "Figure 11.") (Plywood panels mounted on wood, steel angle, and plastic c-channel posts.)

9) Skid-mounted Sign Support. (See Figure II.17
"Figure 10.") (No modifications, but was tested end-on.)