CATEGORY 600 SHOULDERS SECTION 605 — METAL TRAFFIC BARRIERS
605.01 Description
Furnish and Install metal traffic barriers.
605.01.01 Training and Certifications. The Traffic Barrier W-Beam Manager (TBWBM) shall
have valid certification from successful completion of the Installer option of the “SHA Traffic Barrier Certification.” At all times during the contract, maintain current valid certifications for at least one TBWBM.
605.01.02 Traffic Barrier W-Beam Manager (TBWBM). The Traffic Barrier W-Beam
Manager (TBWBM) is responsible for the appropriate installation of traffic barrier w-beam systems and end treatments, including methods of operation and implementation of corrective actions. Duties include the following
a.Attend pre-construction meeting.
b.Must be present for the entire duration of traffic barrier work to ensure compliance with the Contract Documents and adherence to the manufacturer installation manual for the product being installed.
c.Authorize mobilization of crews to make immediate repairs and implement corrective actions to damaged traffic barrier w-beam and end treatments. In situations where the Engineer determines that public safety is endangered, report for evaluation and determination of work within 24 hours of notification. Coordinate with the Engineer to ensure that all deficiencies are immediately corrected, and that the Contract remains in compliance.
d.When requested, accompany the Engineer during inspections. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS
605.02 Materials
Refer to 606.02, 609.02, 701.02, 705.02, 708.02, 709.02, and the following: Common Borrow 916.01 W-Beam/Thrie-Beam 918.01 Steel Posts 918.02 Traffic Barrier Hardware 918.03 Timber Posts 918.04 Wood Offset Blocks 918.04, grooved or routed Wire Rope 918.05 Rub Rail A36, Galvanized, A123 Galvanizing Repair 465.03.05 Composite Offset Blocks As approved, grooved or routed Reflective Delineators As approved
605.03 Construction
605.03.01 Preliminary Activities. Prior to beginning construction activities, complete the
following.
a.Attend the Pre-Construction Meeting and present a general overview of how the traffic barrier w-beam systems and end treatments will be installed. TBWBM must attend.
b.Assign a Traffic Barrier W-Beam Manager (TBWBM) and submit to the Engineer the name(s) and credentials of the TBWBM for approval at least 10 days prior to beginning traffic barrier work. Each installation crew shall have an approved TBWBM in the project files. There may be multiple TBWBMs approved for the Contract. There may be multiple or different TBWBM each calendar day designated to be available 24 hours to respond to emergency situations. The TBWBM shall hold a valid certification as specified in 605.01.01 for the duration of the traffic barrier work.
c.Do not perform excavation, grading, or post installation without the presence of an Administration representative.
605.03.02 TBWBM. Do not commence work without an approved TBWBM meeting the
certification requirements as specified in 605.01.01. Should there be no TBWBM available with valid unrevoked certifications, immediately cease construction activities and submit to the Engineer for approval the name and credentials of a new TBWBM meeting the certification as specified in 605.01.01. Resume construction activities when directed by the Engineer. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS
605.03.03 Quality Assurance Inspections. All traffic barrier activities within the Contract are
subject to routine, periodic, scheduled, unscheduled, and random field inspections by one or more representatives from the Administration. If non-conformance with the Contract Documents or with the manufacturer installation manuals is determined, the Administration representative(s) will immediately notify the Engineer of the needed corrective actions. Corrective actions may require shutdown of construction activities until the non-conformance is satisfactorily addressed. Failure to satisfactorily address the deficiencies within 72 hours of written notification from the Engineer may result in immediate revocation of the “SHA Traffic Barrier Certification” from the TBWBM for at least six months and until successful completion of the Administration’s Traffic Barrier Certification course and exam. Upon meeting 605.01.01 they may resume their former roles on the project.
605.03.04 Post Installation
a.Install posts plumb to the specified depth. Drive posts, unless otherwise directed, using a method that will not batter or distort the posts.
b.If posts are not driven, dig holes of sufficient diameter to allow tamping of the backfill and install the posts as follows. (1) When rock is encountered, drill a 12 in. diameter hole to the specified footing depth or drill into the rock to at least a depth of 24 in., whichever is less.
2.When the 24 in. depth is reached prior to the specified footing depth, discontinue drilling, and cut the post to the appropriate length and paint the cut edge with galvanizing repair paint.
3.Backfill with approved common borrow, CR6, or other material as directed. Place backfill in horizontal layers not exceeding a depth of 6 in. and thoroughly compact. Do not use concrete or grout material.
c.Do not install posts into pavement.
d.Remove and dispose of unsuitable materials and restore areas to match adjacent turfgrass, asphalt millings or grindings, or crusher run aggregate CR-6.
e.Align posts to within 1/4 in. of line and grade before installing rail.
605.03.05 Rail Assembly. Install rail elements in accordance with the SHA Book of Standards.
Ensure a smooth and continuous installation, with laps in the direction of traffic flow. Ensure all bolts are tight.
605.03.06 Offset Blocks. Install wood or composite offset blocks with grooves or router lines to
prevent the blocks from rotating. Do not mix different types of composite offset blocks. Do not mix composite and wood blocks.
605.03.07 Grading Adjustment. When grading adjustment is required for installation of traffic
barrier, adjust the grading using topsoil, crusher run aggregate CR-6, asphalt millings or grindings, subsoil, common borrow, or other approved materials as follows:
a.Non-Landscaped Areas. For grading adjustment, install common borrow or subsoil as specified in 204.03.04 or 701.03.04 to the grade that is 4 in. below the final grade. Complete the grading adjustment with crusher run aggregate CR-6 or asphalt millings or grindings.
b.Landscaped Areas. For grading adjustment up to 8 in. depth, complete the adjustment with topsoil as specified in Section 701, and perform sodding or seeding as described in 605.03.07 (c). For surface adjustment more than 8 in. depth, the use of aggregate fill is prohibited. Install subsoil or approved common borrow as specified in Section 204 or Section 701 to the grade that is 4 in. below the final grade. Complete the adjustment with topsoil as specified in Section 701 and perform sodding or seeding as described in605.03.07 (c).
c.Sodding or Seeding. Immediately after placing topsoil, perform Turfgrass Sod Establishment as specified in Section 708. Alternatively, perform Turfgrass Establishment as specified in Section 705 and install Soil Stabilization Matting as specified in Section 709.
605.03.08 Traffic Barrier Reflective Delineators. Install reflective delineators as specified.
605.03.09 Remove and Reset Existing Traffic Barrier. Replace severely corroded or damaged
individual traffic barrier panels as directed. When removing and resetting an entire run or a portion of a run of traffic barrier, replace any steel offset brackets with either wood or composite offset blocks as specified in 605.03.06. When removing and resetting an entire run, use 8 in. offset blocks. When removing and resetting only a portion of a run, match the offset blocks of the existing run as directed. Ensure that the holes in the blocks match the holes in the existing posts. When resetting the rail, measure the height of the rail to ensure that it conforms to the current height shown in the Book of Standards. Raise existing rail and posts that do not conform to the current height without damaging the traffic barrier, posts, offset blocks, or surrounding area. Unless otherwise directed, maintain the existing offset distance from the edge of the roadway. After replacing traffic barrier panels, restore the disturbed areas as specified in 605.03.07. 605.03.10 Remove and Reset Existing Median Traffic Barrier. Refer to 605.03.09. 605.03.11 End Treatments. As specified in Section 606. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS
605.03.12 Removal and Disposal of Traffic Barrier. Make every effort to recycle or stockpile
all existing metal components of traffic barrier. Submit written certification of material recycled or stockpiled to the Administration upon construction completion, including date, time, materials, measurement, and other pertinent information. After removal and disposal of traffic barrier, restore the disturbed areas as specified in 605.03.07.
605.04 Measurement and Payment
Payment will be full compensation for all driving, excavating, drilling, traffic barrier rail elements, offset blocks, traffic barrier posts, backfill, compaction, and for all material, labor, equipment, tools, disposal fees, and incidentals necessary to complete the work.
605.04.01 Traffic Barrier W-Beam Using 6 Foot Post or 8 Foot Post will be measured and paid for
at the Contract unit price per linear foot. 605.04.02 Traffic Barrier W-Beam Panel. When a bottom W-beam panel is specified for the Traffic Barrier W-Beam item, it will be measured and paid for at the Contract unit price per linear foot.
605.04.03 Traffic Barrier W-Beam Median Barrier will be measured and paid for at the Contract
unit price per linear foot. 605.04.04 Traffic Barrier W-Beam Median Barrier with Bottom Panel will be measured and paid for at the Contract unit price per linear foot. 605.04.05 Traffic Barrier Thrie-Beam will be measured and paid for at the Contract unit price per linear foot. 605.04.06 Traffic Barrier Thrie-Beam Median Barrier will be measured and paid for at the Contract unit price per linear foot. 605.04.07 Replacing 6 foot or 8 foot posts, installing additional 6 foot or 8 foot posts, splice joints, and replacing W-beam and Thrie-beam panels will be measured and paid for at the pertinent Contract unit price.
605.04.08 Traffic Barrier Reflective Delineators will be measured and paid for at the Contract unit
price per each. 605.04.09 Remove and Reset Existing Traffic Barrier W-Beam or Thrie Beam will be measured and paid for at the Contract unit price per linear foot. 605.04.10 Remove and Reset Existing Median Traffic Barrier W-Beam or Thrie Beam will be measured and paid for at the Contract unit price per linear foot. 605.04.11 Remove and Reset Existing Median Traffic Barrier W-Beam with Bottom Panel will be measured and paid for at the Contract unit price per linear foot. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS
605.04.12 Removal and Disposal of Existing Traffic Barrier W-Beam or Thrie Beam will be
measured and paid for at the Contract unit price per linear foot, including all costs required for disposal and certification. Certification of material recycled or stockpiled will be required prior to payment.
605.04.13 Grading Adjustment using topsoil and subsoil will be measured and paid for at the
Contract unit price as specified in 701.04. 605.04.14 Grading Adjustment using CR-6 crusher run aggregate, or asphalt millings or grindings, will be measured and paid for as specified in 606.04.06. 605.04.15 Grading Adjustment using common borrow will be measured and paid for at the contract unit price per cubic yard as specified in 203.04. 605.04.16 Grading Adjustment using other approved materials will be measured and paid for as pertinent items. 605.04.17 Type A Soil Stabilization Matting or Type E Soil Stabilization Matting will be measured and paid for at the Contract unit price per square yard. 605.04.18 Turfgrass Sod Establishment or Turfgrass Establishment will be measured and paid for at the Contract unit price per square yard. 605.04.19 The Traffic Barrier W-Beam Manager(s) will not be measured but the cost will be incidental to the Traffic Barrier W-Beam items. Replacement of the Traffic Barrier W-Beam Manager(s) with another will be at no additional cost to the Administration. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS 606 — PERMANENT TRAFFIC BARRIER END TREATMENTS 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS CATEGORY 600 SHOULDERS SECTION 606 — PERMANENT TRAFFIC BARRIER END TREATMENTS
606.01 Description
Furnish and install permanent traffic barrier end treatments. Refer to 605.01.01 and 605.01.02.
606.02 Materials
Refer to 605.02, 701.02, 705.02, 708.02, 709.02 and the following: End Treatments As specified by the manufacturer Spare Parts Packages As specified by the manufacturer Antifreeze Agent As approved Reflectorization 950.03 Plastic Barrels (Yellow) Standard MD 104.01-70 Sand 901.01 Portland Cement Concrete 902.10, Mix 2 and 6 Concrete 902.10, Mix 7
606.03 Construction
606.03.01 Refer to 605.03.01, 605.03.02, and 605.03.03. Document each step of the installation,
and complete and submit to the Engineer the manufacturer installation checklist for the installed product.
606.03.02 End Treatments
a.Buried-in-Backslope End Treatment (Type A). Excavate the slope to install these components. Bury the ends of the traffic barrier, the end treatment anchorage, and the bottom rail, when required, in a cut slope. Upon installation, backfill and stabilize the area as specified in 606.03.03 to match the adjacent slope. For single rail systems, use 6 ft posts throughout the entire end treatment. For double rail systems, use 8 ft posts, except for the last three posts buried in the cut slope.
Source: Maryland Standard Specifications for Construction and Materials, 2025 Edition. Pages 769–774 of 1,113.