626.05 Method of Measurement
626.06 Basis of Payment
626.01 Description. This work consists of furnishing and installing barrier reflectors on galvanized steel guardrail, concrete barrier, retaining wall, and bridge parapets.
Barrier Reflectors.................................................... 720.04
Conform to the manufacturer’s recommendations for corrosion resistant fasteners, brackets, or adhesives.
Use barrier reflectors that are mountable on guardrails, concrete barriers, retaining walls, and bridge parapets. For guardrail mount, the unit must fit within the channel exposed to traffic and not protrude beyond the depth of the channel. For wall or parapet mount, the barrier reflector may not extend further than 5 inches (125 mm) in a horizontal direction towards the traffic lanes.
626.03 Layout. Lay out all locations to ensure proper placement. The Engineer will approve the layout before installation of the reflectors.
Furnish reflectors at the beginning and the end of all barrier runs and at least one additional point evenly spaced between the termini. Space the reflectors at 100 feet (30 m) on tangents and on curves of less than 5 degrees (more than 350 m radius). Space the reflectors at 50 feet (15 m) for curves of greater than 5 degrees (350 m radius or less).
The Contractor may vary the spacing on tangents and curves of less than 5 degrees (more than 350 m radius) from 65 feet to 125 feet (20 m to 40 m) in the final 250 feet (80 m) to achieve even spacing of the reflectors.
If using a guardrail anchor assembly or a guardrail bridge terminal assembly, place the first (or last) reflector near the first (or last) post rather than at the end of the assembly.
If using a buffer end section or similar device on the end of the guardrail, place the first reflector so that it is visible to approaching traffic.
If tying guardrails, barriers, retaining walls, or bridge parapets together in a continuous run, use the total length of the run for determining the number and location of reflectors.
If installing a run of rail or barrier that is at varying distances from the edge of pavement, place a reflector where the run first approaches closest to the pavement. If this results in spacing greater than 125 feet (40 m), or 65 feet (20 m) in cases where 50-foot (15 m) standard spacing is required, install an additional reflector. If a non-reflectorized impact attenuator is in place, place an additional reflector on the face of the attenuator nearest to, and directed toward, approaching traffic.
626.04 Installation. Attach the reflector with a suitable corrosion resistant fastener, bracket, or adhesive conforming to the manufacturer’s recommendations.
On concrete barriers, retaining walls, and bridge parapets, place the top of the reflector so its height is 26 inches (650 mm) above the near edge of pavement, except that the top of the reflector is at least 3 inches (75 mm) below the top of the concrete barrier.
Install guardrail reflectors within the concave surface of the guardrail. The Contractor may attach guardrail reflector by using a bracket that fits under the head of the post bolt, by applying the above referenced adhesive according to the manufacturer’s recommendation, or by other acceptable method.
Remove loose concrete, rust, dirt, and other loose material from the surface of the concrete barrier or guardrail using a wire brush. Remove dust created by wire brushing before applying adhesive. Apply adhesive to clean and moisture-free surfaces according to the manufacturer’s recommendations.
Ensure that the reflector face is clean and free of dust, dirt, adhesive, or any foreign material after installation.
Except if mounted in the concave recess of guardrail, rotate the reflective face of one-way reflectors upward from the vertical (or plumb) position 2 to 3 degrees to facilitate “rain washing” of the reflector face.
When replacing reflectors on a concrete surface, locate the new reflector approximately 3 inches (75 mm) horizontally in either direction from the old location.
If specified, use bi-directional reflectors (white/white) on the outside of curves on two-lane highways.
Use barrier reflectors that are the same color as the adjacent edge line.
626.05 Method of Measurement. The Department will measure Barrier Reflector, Type ___ by the number of each in place, completed and accepted. The Department will classify the reflectors for measurement as follows:
Concrete barrier, retaining walls, or bridge parapets
If a bi-directional reflector consists of two one-way reflectors mounted back-to-back, the Department will measure it as one bi-directional reflector.
626.06 Basis of Payment. The Department will pay for accepted quantities at the contract prices as follows:
Item unit Description
626 Each Barrier Reflector, Type A
626 Each Barrier Reflector, Type B
626 Each Barrier Reflector, Type A2
626 Each Barrier Reflector, Type B2