621TRAFFIC BARRIERS

621.01 DESCRIPTION . This work shall consist of furnishing, assembling, removing, repairing, or

resetting traffic barriers.

621.02 MATERIALS . Materials shall meet the requirements of the following subsections:

Grease Rustproofing Compound ................................ ................................ ................ 708.04 Coatings for Wood ................................ ................................ ................................ .....708.05 Galv anizing ................................ ................................ ................................ ................ 726.06 Posts ................................ ................................ ................................ ........................... 728.01 Beam and Cable Elements ................................ ................................ ......................... 728.02 Hardware ................................ ................................ ................................ .................... 728.03 Offset Blocks ................................ ................................ ................................ ............. 728.04 Concrete Anchors ................................ ................................ ................................ .......728.05 Manufactured Terminal Sections ................................ ................................ ............... 728.06 Energy Absorption Attenuators ................................ ................................ ................. 728.07 Temporary Traffic Barrier ................................ ................................ ......................... 728.08 Flat Sheet Aluminum ................................ ................................ ................................ .750.03 Retroreflective Sheeting ................................ ................................ ............................. 750.04 Reinforcing steel shall meet the requirements of Section 507 . Materials for removing and resetting guardrail, replacing guardrail post assemblies, replacing guardrail beam units, and adjust the height of guardrail sha ll consist of the acceptable beams and cable, posts, offset blocks, bolts, and other hardware of the existing guardrail together with the necessary new replacement parts. The new replacement parts shall match the existing components they replace as closely as possible. All welding shall conform to the requirements of Subsection 506.10 .

621.03 FABRICATION DRAWINGS . The fabricator of guardrail approach sections furnished under this

section shall submit detailed fabrication drawings in accordance with Subsect ion 105.06 .

621.04 POSTS AND OFFSET BLOCKS . Posts may be set in holes, or they may be driven if suitable

caps and driving equipment are used to prevent damage to the posts. The installed posts shall be plumb, accurately aligned, spaced as shown on the Plans, and placed to the full depth indicated. The space around the posts shall be backfilled with suitable material in 6 inch layers and tamped thoroughly with air or mechanical tampers. 6-75 Posts for steel backed timber guardrail may be driven or installed into pre -drilled holes. The dimensions of the pre-drilled hole shall not exceed the dimensions of the post by more than 1 inch. If impenetrable material is encountered while placing the post, the pre -drilled hole shall be enlarged to provide not less than 6 inches of clearance on all sides and a mini mum depth of 2 -1/2 feet and the post shall be set in concrete to within 6 inches of the top of the hole. The type of concrete shall be approved by the Engineer. The remaining 6 inches shall be backfilled with a suitable material and compacted to the satisf action of the Engineer. The guardrail designated to be removed and reset shall be carefully removed, temporarily stored when necessary, and reinstalled at the new location. Materials damaged or lost shall be replaced with new material by the Contractor at no cost to the Agency. The new materials shall be equal to or better than the material of the existing guardrail. Guardrail to be removed and reset shall be installed at the height specified on the Plans for the type of guardrail being reset. Guardrail pos ts and anchors shall be installed prior to placing the adjacent top course of pavement unless otherwise directed by the Engineer.

621.05 Rail Elements .

621.06 ENERGY ABSORPTION ATTENUATORS . Energy absorption attenuators, permanent or

temporary, shall be installed at the locations shown on the Plans or in the approved traffic control plan and per the manufacturer’s recommendations. Installation of any traffic barrier requiring protection with an energy absorption attenuator shall not begin until the complete energy absorption attenuator i s on the project site and ready to be installed. Attenuators shall be a minimum of Test Level 3 for posted speed limits greater than 40 mph and a minimum of Test Level 2 for posted speed limits of 40 mph and less, in accordance with MASH .

621.07 TEMPORARY TRA FFIC BARRIER . Temporary traffic barrier shall be installed at the locations

shown on the Plans, in the approved traffic control plan, or as directed by the Engineer and per the manufacturer’s recommendations. The barrier shall be one of the barriers included in the FHWA Roadside Hardware Policy Memoranda and Guidance for crashworthy longitudinal barriers, at the Contractor’s discretion, unless otherwise specified. The Contractor shall provide the name of the temporary traffic barrier and current FHWA eligibility letter for the t emporary traffic barrier to the Engineer prior to installation. If temporary traffic barrier meeting NCHRP Report 350 is used, the Contractor shall submit an affidavit certifying that it was manufactured prior to January 1, 2020. Temporary traffic barrier components shall be in a condition satisfactory to the Engineer prior to placement on the project and maintained as such until removed from the project. Temporary traffic barrier shall be removed from the project w hen no longer needed and shall remain the property of the Contractor. The area from which the barrier was removed shall be restored to a satisfactory condition. Temporary traffic barrier and required appurtenances shall be removed and reset as shown on the Plans or as ordered in writing by the Engineer. 6-77 621.08 TEMPORARY TRAFFIC PROTECTION . Barrier used for temporary traffic protection shall be existing guardrail that is removed and reset, new guardrail, or temporary traffic barrier installed in locations detailed on the Plans to allow full -width construction. Barrier for temporary traffic protection shall only be used during the construction season on active projects as a temporary protection method. Any traffic protection measures that are requi red during shutdowns of work activities shall be permanent and conform to applicable standards.

621.09 TERMINALS AND END ASSEMBLIES . Terminals and end assemblies shall be installed at the

locations shown on the Plans and as detailed on the Plans or per the manufacturer’s recommendations. New traffic barrier installations shall be protected by a terminal or end assembly the same day the traffic barrier is installed and may be protected perm anently as shown on the Plans or temporarily as approved by the Engineer. Temporary terminals and end assemblies shall not be in place more than 48 hours and will be considered incidental to other traffic barrier items. All new terminal and end assembly installations shall include a permanent identification of the year of installation and model identified on the Agency’s Approved Products List or the Standard Drawing used. Payment will be incidental to the traffic barrier items. Terminals and end assemblies shall be of the type specified in the Contract.

621.10 ANCHORS . Anchors shall be installed at the locations s hown on the Plans. Backfill material shall

be placed in layers of not more than 6 inches and shall be thoroughly compacted by use of a mechanical tamper, to the satisfaction of the Engineer. Cables, when required, shall be drawn taut and fastened securely to the anchor assemblies as shown on the Plans and adjusted to equalize the stresses.

621.11 DELINEATION . Delineation devices shall consist of flat sheet aluminum and retroreflective

sheeting of the design shown on the Plans and shall be securely fastened to traffic barriers as shown on the Plans or as directed by the Engineer.

621.12 FIELD PAINTING . Galvanized components that have been cut, abraded, or damaged such that

base metal is exposed shall be repaired with two coats of zinc paint in accor dance with Subsection 726.06 , and paint when specified on the Plans. Wherever guardrail panels are nested, the surfaces on both panels that will be in contact with each other shall be coated with grease rustproofing compound. Overlapping at splices will no t be considered nesting. 6-78 621.13 REPLACEMENT, ADJUSTMENT, REMOVAL, AND DISPOSAL . Guardrail which is to remain in place will be inspected by the Engineer for damage, unsuitability, and conformance to current guardrail standards. The Engineer will mark guardrail components which a re to be replaced. The guardrail shall then be checked for height conformance. Guardrail sections which measure outside of the allowable heights specified in Table 621.13A shall be adjusted to the standard height described for the type of guardrail to be adjusted. All measurements shall be taken from the adjacent pavement surface to the top of rail. TABLE 621.13A – ALLOWABLE GUARDRAIL HEIGHTS Guardrail Type Low Measure Tolerance (in.) High Measure Tolerance (in.) Adjust to Height (in.) Standard W -beam (splice at post) 27-3/4 31 29 Midwest Guardrail System (MGS, splice between posts) 29-3/4 33 31 Box beam 25-3/4 29 27 Sections which generally conform for height but have many variations due to erosion or filling of the shoulder from normal mechanisms shall have the shoulder graded as specified on the Plans before being checked for height conformance. After adjustment is complete, the existing rail shall conform to cur rent design standards for height as appropriate for the type of guardrail being adjusted. Guardrail height adjustments shall be made to reflect guardrail height at final grade. The Contractor shall repair or replace all damaged or missing components. Compo nents shall be repaired or replaced as determined by the Engineer and in accordance with the Plans or current standards, as applicable. The finished appearance of the rehabilitated rail shall be a continuous smooth line without abrupt dips over the entire section, to the satisfaction of the Engineer. Offset blocks designated for replacement shall be replaced with polyvinyl blocks unless wood blocks are specifically called for on the Plans. Materials shall be in conformance with the applicable requirements o f Subsection 728.0 4. 6-79 Unless otherwise specified in the Contract, material to be removed shall become the property of the Contractor. Materials removed from service shall be removed from the state right -of-way limits at the end of each work day, unless otherwise approved by the Engineer. Materials removed shall be disposed of in accordance with applicable local, state, and federal regulations. Unless otherwise indicated, anchors which are designated for removal and disposal, not removal and salvage, may have the anchor or anchor block abandoned in place with the anchor rod cut in such a manner that no portion of the anchor assembly is within 1 foot of the ground, shoulder, or roadway surface. If posts or anchors are removed from an area where there is no other excavation or embankment work, the resulting holes shall be backfilled with suitable material matching as closely as possible the surface, subbase, and other materials in both type and de pth. The backfill shall be placed in layers not more than 6 inches in depth, thoroughly compacted using a mechanical tamper, and the area seeded in accordance with Section 651 . Existing materials to be salvaged shall be protected from damage or loss by the Contractor during construction operations. Materials lost or damaged shall be replaced with new materials by the Contractor at no expense to the Agency. New materials shall be equal to, or better than, the materials in the existing guardrail.

621.14 METHOD OF MEASUREMENT . The quantity of Removal of Guardrail to be measured for

payment will be the number of linear feet removed in the complete and accepted work, measured from end post to end post to whi ch rail was attached. The quantity of Removal of Guardrail Posts and Removal of Guardrail Offset Blocks to be measured for payment will be the number of each removed in the complete and accepted work. The quantity of Remove and Reset Temporary Traffic Barr ier to be measured for payment will be the number of linear feet removed and reset, measured from end -to-end of the allowable length, including energy absorption attenuators as needed, as described herein, as shown on the Plans, or as directed by the Engin eer. The quantity of Remove and Reset Guardrail to be measured for payment will be the number of linear feet reset in the complete and accepted work, measured in accordance with the type of guardrail specified. 6-80 The quantity of Adjust Height of Guardrail to be measured for payment will be the number of linear feet of adjusted guardrail complete in place measured from center to center of the end posts to which the rail elements are attached. Payment will not include measurement of any rail element or anchorage which extends beyond the last post to which the rail elements are attached, nor will any factor based on post spacing distances be applied to the measured distance. The quantity of Replace Guardrail Beam Unit, W -Beam; Replace Guardrail Beam U nit, Box Beam; and Replace Guardrail Beam Unit, Thrie Beam to be measured for payment will be the number of 12.5 -foot rail panels replaced. Those rail panels that are longer or shorter than 12.5 feet in length shall be converted to an equivalent number of 12.5-foot rail panels. The quantity will not be factored for post spacing. The quantity of Replace Guardrail Post Assembly, W -Beam with 6 Foot Posts; Replace Guardrail Post Assembly, W -Beam with 8 Foot Posts; Replace Guardrail Post Assembly, Box Beam; and Replace Guardrail Post Assembly, Thrie Beam to be measured for payment will be the number of individual posts replaced in the complete and accepted work. The quantity of Steel Beam Guardrail; Steel Beam Guardrail with 8 Foot Posts; Steel Beam Guardrail, Nested; Steel Beam Guardrail with 8 Foot Posts, Nested; HD Steel Beam Guardrail; HD Steel Beam Guardrail with 8 Foot Posts; HD Steel Beam Guardrail, Nested; HD Steel Beam Guardrail with 8 Foot Posts, Nested; and Thrie Beam Guardrail to be measured for paymen t will be the number of linear feet of each kind specified installed in the complete and accepted work, measured center to center of end posts to which rail is attached. The measured quantity will not include those portions of the installation within the p ay limits for manufactured terminal section (MTS) or terminal connector items. Where terminal end sections are installed, an additional 2 feet of guardrail will be included for each end section. W -beam to Thrie beam transition sections will be paid for as an equal length of Thrie beam guardrail. The measured quantity of Steel Beam Guardrail of the type specified, HD Steel Beam Guardrail of the type specified, and Thrie Beam Guardrail will be multiplied by the post spacing factors specified in the Table 621. 14A. TABLE 621.14A – BEAM GUARDRAIL POST SPACING FACTORS Post Spacing Factor 6 ft 3 in. 1.0 4 ft 2 in. 1.2 3 ft 1 -1/2 in. 1.4 6-81 The quantity of Steel Beam Guardrail Offset Block; Terminal Connector for Steel Beam Guardrail; Anchor for Steel Beam Guardr ail; Anchor for Steel Beam Guardr ail, MGS; Anchor for Steel Beam to Box Beam Transition; and Traffic Barrier Delineator to be measur ed for payment will be the number of each component installed in the complete and accepted work. The quantity of Guardrail Transition, Steel Beam to Box Beam to be measured for payment will be the number of linear feet of transition rail used in the comple te and accepted work. Measurement will be made along the face of the rail from end to end or between the pay limits specified. The quantity of Box Beam Guardrail to be measured for payment will be the number of linear feet installed in the complete and acc epted work, measured from center to center of end posts. An additional 1 foot of guardrail will be allowed for each overhang. The quantity of Temporary Traffic Barrier to be measured for payment will be the number of linear feet installed and removed in the complete and accepted work, measured from end to end of each installation, including terminals. Any barrier removed and not reset will not be measured for payment under this item, but will be considered incidental to the original installatio n of the barrier. No measurement for payment will be made for barrier that is removed and reset for the convenience of the Contractor, for minor adjustments of 2 feet or less in any direction, or for any removal and resetting that was not approved by the E ngineer. The quantity of Temporary Traffic Protection to be measured for payment will be the number of linear feet of barrier placed in the complete and accepted work, measured from end to end of each installation, including end terminals and anchors. Only the initial removal and resetting of existing guardrail, placement of new guardrail, or placement of temporary traffic barrier used for temporary traffic protection will be measured for payment. Any other interim placements or adjustments prior to install ation of permanent guardrail, either for the convenience of the Contractor, damage after initial placement, or as directed by the Engineer, will be considered incidental to the work. The quantity of Steel Backed Timber Guardrail to be measured for payment will be the number of linear feet installed in the complete and accepted work, measured from end to end along the face of rail, including terminal sections. The measured length will be multiplied by a factor of 1.4 for a post spacing of 5 feet. The quantit y of MTS of the type specified; Box Beam Guardrail End Assembly, Type IIA; and Guardrail Approach Section of the type specified to be measured for payment will be the number of units of each type specified, installed in the complete and accepted work. 6-82 The quantity of Energy Absorption Attenuator, Temporary of the type specified and Energy Absorption Attenuator, Permanent of the type specified to be measured for payment will be the number of each unit installed in the complete and accepted work. The spar e temporary energy absorption attenuator will not be measured for payment since supplying a spare on the project will be considered incidental to the Energy Absorption Attenuator, Temporary item.

621.15 BASIS OF PAYMENT . The accepted quantity of Removal o f Guardrail will be paid for at the

Contract unit price per linear foot. Removed guardrail that is not reset will be paid for as Removal of Guardrail. Payment will be full compensation for removing and disposing of materials, including treated timber curbi ng and the associated bituminous concrete fillet, and for restoration of the old site when required. The accepted quantity of Removal of Guardrail Posts and Removal of Guardrail Offset Block s will be paid for at the Contract unit price for each. Payment w ill be full compensation for removing and disposing of materials and for restoration of the old site when required. The accepted quantity of Remove and Reset Temporary Traffic Barrier will be paid for at the Contract unit price per linear foot. Payment wil l be full compensation for removing, transporting, storing, reassembling all parts necessary, cutting, furnishing of new parts when necessary, reinstalling at the new locations, reinstalling required terminals or energy absorption attenuators, and for furn ishing all labor, tools, equipment, and incidentals necessary to complete the work. Payment will also include removing and replacing anchors. The accepted quantity of Remove and Reset Guardrail will be paid for at the Contract unit price per linear foot. P ayment will be full compensation for removing, transporting, storing, reassembling all parts necessary; removing and disposing of treated timber curbing and the associated bituminous concrete fillet; cutting; furnishing of new hardware when necessary; rein stalling at the new locations; furnishing and applying stain, paint, and preservative material; and for furnishing all labor, tools, equipment, and incidentals necessary to complete the work. Payment for removing and replacing anchors, terminals, and end a ssemblies when required will be paid for under the applicable Contract items. Replacing panels, offset blocks, and posts will be paid for separately under the applicable Contract items. The accepted quantity of Adjust Height of Guardrail will be paid for a t the Contract unit price per linear foot. Payment will be full compensation for adjusting the height of the existing guardrail to conform to current standards; for any necessary excavation and backfill, including proper compaction; for furnishing, transpo rting, handling, and installing components which are necessary to make the adjusted guardrail a complete installation and which are not part of any other pay item in the Contract; for disposing of removed components which are not reused; and for furnishing the labor, tools, equipment, and incidentals necessary to complete the work. Replacing panels, offset blocks, and posts will be paid for separately under the applicable Contract items. 6-83 The accepted quantity of Replace Guardrail Beam Unit, W -Beam; Replace Guardrail Beam Unit, Box Beam; and Replace Guardrail Beam Unit, Thrie Beam will be paid for at the Contract unit price for each. Payment will be full compensation for removing and disposing of the designated beam panel; for furnishing, transporting, handl ing, and installing the replacement components needed, including new rail beam units of the required length; replacement backer plates if required and not covered under another Contract item, new reflectors or other delineation if required and not covered under a post assembly replacement item; new bolts, nuts, washers, and any other necessary hardware; for drilling holes as required to complete the installation of the replacement panel; and for furnishing all labor, tools, equipment, and incidentals necess ary to complete the work. Minor repairs and replacement of parts for anchorage devices, such as tightening nuts, adjusting turn buckles, replacing nuts or bolts, rethreading rod ends, etc. will be considered incidental to the other Section 621 pay items in the Contract. The accepted quantity of Replace Guardrail Post Assembly, W-Beam with 6 Foot Posts; Replace Guardrail Post Assembly, W-Beam with 8 Foot Posts; Replace Guardrail Post Assembly , Box Beam ; and Replace Guardrail Post Assembly , Thrie Beam will be paid for at the Contract unit price for each. Payment will be full compensation for removing and disposing of the designated post and hardware; for any necessary excavation and backfill, including proper compaction; for furnishing, transporting, h andling, and installing the replacement post or backup plate if required; new bolts, nuts, washers and any other necessary hardware; steel strapping as necessary; stain, paint, and preservative; and for furnishing all labor, tools, equipment, and incidenta ls necessary for the work. The accepted quantity of Steel Beam Guardrail; Steel Beam Guardrail with 8 Foot Posts; Steel Beam Guardrail, Nested; Steel Beam Guardrail with 8 Foot Posts, Nested; HD Steel Beam Guardrail; HD Steel Beam Guardrail with 8 Foot Pos ts; HD Steel Beam Guardrail, Nested; HD Steel Beam Guardrail with 8 Foot Posts, Nested; Thrie Beam Guardrail; and Box Beam Guardrail will be paid for at the Contract unit price per linear foot. Payment will be full compensation for furnishing, transporting , handling, and placing the materials specified; removing and disposing of damaged guardrail components; and for furnishing all labor, tools, equipment, and incidentals necessary to complete the work. The accepted quantity of Steel Beam Guardrail Offset B lock; Terminal Connector for Steel Beam Guardrail; Anchor for Steel Beam Guardr ail; Anchor for Steel Beam Guardr ail, MGS; Anchor for Steel Beam to Box Beam Transition; and Traffic Barrier Delineator will be paid for at the Contract unit price for each. Pay ment will be full compensation for furnishing, transporting, handling, and placing the materials specified; removing and disposing of damaged guardrail components; and for furnishing all labor, tools, equipment, and incidentals necessary to complete the wo rk. The accepted quantity of Guardrail Transition, Steel Beam to Box Beam will be paid for at the Contract unit price per linear foot. Payment will be full compensation for detailing, furnishing, handling, placing, delineating, and galvanizing the railing components, including W -beam sections requiring replacement; and for furnishing all labor, tools, equipment, and incidentals necessary to complete the work. 6-84 The accepted quantity of Temporary Traffic Barrier will be paid for at the Contract unit price pe r linear foot. Payment will be full compensation for furnishing and installing barrier and any required terminals or protective end devices, and for removal and site restoration where required. The accepted quantity of Temporary Traffic Protection will be paid for at the Contract unit price per linear foot. Payment will be f ull compensation for furnishing, detailing, transporting, handling, and installing the temporary traffic protection system , including, but not limited, to excavation, backfill, re -grading the installation area as necessary, delineation devices, posts, blocks, terminals, and hardware, and for furnishing all labor, tools, equipment, and incidentals necessary to complete the work. N ew guardrail installed permanently on the project will be paid for separately under the appropriate Contract items. Existing guardrail removed and not reset on the project, either temporarily or permanently, will be paid for separately under the appropriate Contract items. Placement of barrels o r other delineation devices for the purpose of providing temporary traffic protection will not be paid for under this item but will be incidental to the appropriate traffic control item. The accepted quantity of Steek Backed Timber Guardrail will be paid f or at the Contract unit price per linear foot. Payment will be full compensation for furnishing, transporting, handling, and placing the materials specified; removing and disposing of damaged guardrail components; enlarging holes as necessary for placement of posts; furnishing and placing concrete fill and backfill material, and compacting backfill to the satisfaction of the Engineer; and for furnishing all labor, tools, equipment, and incidentals necessary to complete the work. The accepted quantity of MT S of type specified; Box Beam Guardrail End Assembly, Type IIA; and Guardrail Approach Section of the type specified will be paid for at the Contract unit price for each. Payment will be full compensation for furnishing, detailing, transporting, handling, and installing the terminal sections, assemblies, and approach sections used, including, but not limited to, excavation, backfill, re -grading the installation area as necessary, delineation devices, restraining devices, hardware, preservative treatment, an d for furnishing all labor, tools, equipment, and incidentals necessary for installing a complete and properly functioning unit. The accepted quantity of Energy Absorption Attenuator, Temporary will be paid for at the Contract unit price for each. Payment will be full compensation for fabricating, furnishing, transporting, handling, and installing the materials required, including all hardware; any necessary manufacturer’s supervision; the furnishing of all labor, tools, equipment, and incidentals necessary for installing the attenuator; maintaining, repairing, or replacing the attenuator as necessary while it is in service; and for removing and disposing of the attenuator when it is no longer needed. 6-85 The accepted quantity of Energy Absorption Attenuator , Permanent will be paid for at the Contract unit price for each. Payment will be full compensation for fabricating, furnishing, transporting, handling, and installing the materials required, including all hardware; any necessary manufacturer’s supervision ; and the furnishing of all labor, tools, equipment, and incidentals necessary for installing the attenuator, complete and in place.

621.80 40 Guardrail Approach Section, HD Steel Beam with 8 Foot Posts ............. Each

621.8 120 Guardrail Approach Section, 2 Rail Box Beam ................................ ........ Each 621.8130 Guardrail Approach Section, 3 Rail Box Beam ................................ ........ Each 621.8140 G uardrail Approach Section, 4 Rail Box Beam ................................ ........ Each 621.8230 Guardrail Approach Section, 3 Rail Box Beam, Curbless ........................ Each 621.8231 Guardrail Approach Section to 3 Rail Aluminum ................................ ....Each 621.8232 Guardrail Approach Section to 3 Rail Aluminum, Pedestrian .................. Each 621.8320 Guardrail Approach Section to Concrete Bridge Rail, TL -2 .................... Each 621.8330 Guardrail Approach Section to Concrete Bridge Rail, TL -3 .................... Each 621.9980 Guardrail Approach Section, Metal Truss Bridge ................................ ....Each 621.9990 Guardrail Approach Section, Covered Bridge ................................ .......... Each 6-88 SECTIO N 622 – INSULATIO N BOARD 622.0 1 DESCRIPTION . This work shall consist of furnishing and installing extruded or expanded polystyrene insulation board on a prepared surface. 622.0 2 MATERIALS . Materials shall meet the requirements of the following subsection s: Sand Borrow and Cushion ................................ ................................ ......................... 703.03 Polystyrene Insulation Board ................................ ................................ ..................... 735.01 Skewers shall conform to the requirements of the insulation manufacturer. 622.0 3 PREPARATIO N OF SURFACE . The s urface shall be prepared as follows: