SS-01021
(New)

THE STANDARD SPECIFICATIONS, SERIES 2001, ARE AMENDED BY THE FOLLOWING MODIFICATIONS AND ADDITIONS. THESE ARE SUPPLEMENTAL SPECIFICATIONS AND THEY SHALL PREVAIL OVER THOSE PUBLISHED IN THE STANDARD SPECIFICATIONS.

01021.01  DESCRIPTION.
This work consists of furnishing, installing, and maintaining a modular glare screen system on the top of temporary concrete barrier rail in accordance with the contract documents and the modular glare screen system manufacturer's instructions. The modular glare screen system consists of modular base units attached to the top of concrete barrier rail with blades evenly spaced and securely mounted to the base units.

The Contractor shall apply Type III or Type IV retroreflective sheeting to specific glare screen blades in accordance with the contract documents.

01021.02  MATERIALS.
The modular base units and glare screen blades shall be compatible so the base unit and blades can be securely attached to each other.  The base units and blades shall be supplied from the same manufacturer.

The length of individual modular base units shall be no longer than the nominal length of individual temporary concrete barrier rail sections.  The width of the modular base units shall be no wider than the top width of the temporary concrete barrier rail.

The glare screen blades shall be FHWA highway green in color and made of impact resistant non-metallic high density plastic material.  The blades shall have a height from 24 inches to 30 inches (600 mm to 750 mm) and a width from 6 inches to 9 inches (150 mm to 225 mm).  The same uniform sized blades shall be used throughout the work.

The modular glare screen system shall be manufactured by a company on the approved manufacturer's list in Materials I.M. 486.06, Appendix A.

Type III or IV retroreflective sheeting to be applied to specific glare screen blades shall be 3 inches by 6 inches (75 mm by 150 mm) yellow or white strips meeting the requirements of Section 4186 of the Standard Specifications.

01021.03 CONSTRUCTION
The Contractor shall install the modular glare screen system in accordance with the manufacturer's instructions and with the approval of the Engineer.  The Contractor shall install the modular glare screen system so that it is centered along the longitudinal axis length of the top of the concrete barrier rail.  The Contractor shall install the system so the overhang of the base units, blades, and associated assembly over the edges of the top of the concrete barrier rail is kept to a minimum.

The Contractor shall install the modular base units so they are flush with the top of the concrete barrier rail and they do not extend over the joints between concrete barrier rail sections.

The Contractor shall install glare screen blades so the combination of blade width and spacing provide for a minimum 22 degree sight cut-off angle.

The Contractor shall apply a retroreflective strip to the appropriate glare screen blades at 10 foot (3 m) intervals along the glare screen installation.  The strip shall be applied at the vertical midpoint of the glare screen blade and to the side of the blade nearest to traffic.  The strip shall be applied with the longer dimension vertical and shall be white or yellow, appropriate to the direction of traffic.

The Contractor shall maintain the modular glare screen throughout the work.  The Contractor shall replace or repair damaged parts of the modular glare screen system, as soon as practical, at no additional cost to the Contracting Authority.

When moving temporary barrier rail with the modular glare screen system, the Contractor may temporarily remove base units and glare screen blades, if necessary, to assist in the moving.  The Contractor shall reinstall the removed base units and glare screen blades as soon as the temporary concrete barrier rail has been moved to its new location.

The Contractor shall perform final removal of the modular glare screens from the concrete barrier rail when directed by the Engineer.  Upon removal, there shall be no protrusions on the top of the concrete barrier rail.

Upon completion of the work, the Contractor shall retain ownership of the modular glare screen system.

01021.04  METHOD OF MEASUREMENT.
The Engineer will measure the installed Modular Glare Screen System for payment in liner feet (meters).

01021.05  BASIS OF PAYMENT.
For the quantity of installed Modular Glare Screen System, the Contractor will be paid the contract unit price per foot (meter).  This payment shall be considered full compensation for material, equipment, and labor to furnish and install the system on the top of the temporary concrete barrier rail, furnishing and applying retroreflective strips, maintenance of the system, repairing or replacing damaged parts of the system, removing and reinstalling the system if necessary when moving the concrete barrier rail, and final removal of the system from the top of the concrete barrier rail.