726
Barrier Reflector MATERIALS
726.01 Barrier Reflectors. Furnish
concrete barrier, retaining wall and bridge parapet reflector body housings
that are made of acrylic or polycarbonate plastic, or corrosion resistant
metal. Ensure that the minimum reflective surface area of the reflector is 7
square inches (4400 mm²).
Furnish
white reflectors that reflect the following minimum candela of light at the
indicated observation angles for each 1 foot-candle (10.76 lx) of incident
light at the indicated entrance angles. Furnish amber reflectors that reflect
at least 60 percent of these values.
MINIMUM SPECIFIC INTENSITY,
cd/10.76 lx
Entrance angle |
Observation Angle |
|
0.2° |
2.0° |
|
-4° |
62 |
0.25 |
15° |
52 |
0.18 |
The
entrance angle is measured in the horizontal plane between the direction of
incident light and normal to the face of the reflector. The observation angle
is measured in the vertical plane between the observer’s line of sight and the
direction of light incident to the reflector face.
Furnish
guardrail blockout reflectors that are a minimum size
of 4.5 × 10 × 0.125 inches (112.5 × 250 × 3.1 mm) and made of corrosion
resistant metal with 1/4" (6 mm) predrilled mounting holes. One or both
sides shall be covered with a minimum 4.5 × 5 inches (112.5 × 125 mm) of Type
G, H or J reflective sheeting.
Furnish
materials according to the Department’s Qualified
Products List (QPL).