Pavement Markers Art. 1096.01
o.Material Retainage. The manufacturer shall retain the test sample for a minimum of 18 months. SECTION 1096. PAVEMENT MARKERS
1096.01 Raised Reflective Pavement Markers. Raised reflective pavement
markers shall meet the following specifications.
a.The markers shall be low profile units consisting of an iron casting according to ASTM A 536-84, Grade 72-45-05 hardened to 52-54RC to which is attached a replaceable prismatic retroreflector for reflecting light from one or two directions as specified. The casting shall be shaped to deflect a snowplow blade upward, thus preventing damage to the reflectors. The bottom of the casting shall incorporate two parallel keels and a bow shaped web designed to fit into a grooved road surface. The casting shall have leveling tabs to ensure proper embedment and shall be fastened to the road surface using an epoxy adhesive. The casting shall be designed for bidirectional plowing. The casting shall be marked with the manufacturer's name and the model number of the marker shall be visible after installation.
b.The overall dimensions for raised reflective pavement markers shall be approximately 10 in. (250 mm) long by 5.5 in. (140 mm) wide and a maximum of 1.76 in. (45 mm) high. The surface of the keel and web shall be free of scale, dirt, rust, oil, grease, or any other contaminant which may reduce bond.
c.The reflector shall be of the prismatic type consisting of a methyl methacrylate or suitably compounded acrylonitrile butadiene styrene (ABS) shell filled with a mixture of an inert thermosetting compound and filler material. The exterior surface of the shell shall be smooth and contain one (monodirectional) or two (bidirectional) methyl methacrylate prismatic reflector faces of the colors specified. The shell shall be fabricated in a manner that will provide a mechanical interlock between the thermosetting compound and the shell. The thermosetting compound shall bond directly to the backside of the metalized lens surface. The manufacturer's trademark shall be molded in the face of the reflector lens or on the reflector body so as to be visible after installation.
d.The reflector lens shall be high-intensive type corner cube prismatic and shall provide total internal reflection of the light entering the lens face. The reflector shall be 4 in. (100 mm) long x 2 in. (50 mm) wide x 0.44 in. (11 mm) high and fit securely into a recessed area on the upper surface of the marker casting web. The reflective surface shall be a minimum of 1.6 sq in. (1,030 sq mm) in area. The reflector shall have an abrasion resistant reflective surface. Art. 1096.01 Pavement Markers
e.The specific intensity of the reflective surface at 0.2 degrees divergence angle shall be as follows when the incident light is parallel to the base of the marker. Minimum Specific Intensity (candelas/footcandle (candelas/lux)) Entrance Angle Crystal Amber Red 0° 20° 0° 20° 0° 20° Observation Angle 0.2° 0.2° 0.2° 0.2° 0.2° 0.2° Specific Luminance 3.0 (0.28) 1.2 (0.11) 1.8 (0.16) 0.7 (0.07) 0.7 (0.07) 0.3 (0.03) The marker color(s) shall be as specified in the plans.
1096.02 Temporary Raised Reflective Pavement Markers. Temporary
raised reflective pavement markers shall be according to the following.
a.The marker shall be of the prismatic type consisting of a methyl methacrylate or acrylonitrile butadiene styrene (ABS) shell. The exterior surface of the marker shall be smooth and contain one (monodirectional) or two (bidirectional) methyl methacrylate cube corner prismatic reflector faces of the color specified. The cube corner prismatic reflectors shall either be molded within the marker or sonically sealed to the face of the shell. The manufacturer's trademark shall be molded either in the face of the reflector lens or on the shell so it is visible after installation.
b.The marker shall have a maximum height of 3/4 in. (19 mm), either rectangular or octagonal in shape and a minimum 4 x 3 in. (100 x 75 mm) overall. The base of the marker shall be flat. The reflector face shall slope from the base toward the top of the marker. The reflective area of each face shall be a minimum of 0.35 sq in. (225 sq mm) and may be divided into no more than three separate segments.
c.The markers, without an adhesive pad, shall support a load of 1,000 lb (450 kg). This shall be determined by centering a marker over the open end of a vertically-positioned hollow metal cylinder. The cylinder shall be 1 in. (25 mm) in height and have an internal diameter of 3 in. (75 mm) and a wall thickness of 0.25 in. (6.3 mm). The load shall be applied slowly to the top of the marker through a 1 in. (25 mm) diameter x 1 in. (25 mm) high metal rod centered on top of the marker. Breakage or significant deformation of the marker shall constitute failure.
d.The marker shall have a finish and color that will not fade in ultraviolet conditions or be conducive to tire tracking and will provide good daytime delineation. The specific intensity of the reflective surface at 0.2 degrees divergence angle shall be as follows when the incident light is parallel to the base of the marker. Reflectors Art. 1097.02 Minimum Specific Intensity (candelas/footcandle (candelas/lux)) Color Incidence Angle 0º 20º Crystal 1.0 (0.09) 0.4 (0.04) Amber 0.6 (0.06) 0.2 (0.02) The marker color(s) shall be as specified in the plans. SECTION 1097. REFLECTORS
1097.01 General. Reflectors shall meet the following criteria and shall be on
the Department’s qualified product list. Reflectors shall be constructed of methyl methacrylate (acrylic) plastic and shall have a smooth face free of cracks and checks. The rear surface of the lens shall provide reflectivity by a prismatic configuration such that it will affect total retrodirective internal reflection of light incident to the lens surface without the necessity of any plating or separate reflector. The manufacturer's trademark shall be molded in the face of the reflector lens or on the reflector body so it is visible after installation. The reflectors shall be the color specified in the plans and shall be ready for mounting. The manufacturing quality of reflectors will be tested as follows.
a.Sealing. Submerge one reflector in a water bath at room temperature. Subject the submerged reflector to a vacuum of 5 in. (125 mm) gauge for five minutes. Restore atmospheric pressure and leave the reflector submerged for five minutes. The reflector shall show no evidence of water intake.
b.Heat Resistance. Place three reflectors in a circulating air oven for four hours at 125 ºF (52 ºC) for non-centermounted reflectors and 150 ºF (66 ºC) for centermounted reflectors. The reflectors shall be placed in a horizontal position on a grid or perforated shelf permitting free air circulation. At the conclusion of the test, the reflectors shall be removed from the oven and permitted to cool in air to room temperature. The reflectors shall show no significant change in shape and general appearance when compared with unexposed control reflectors.
1097.02 Guardrail and Barrier Wall Reflectors. Guardrail and barrier wall
reflectors shall be according to the following.
a.Type A Reflectors. Type A reflectors shall be according to Article 1097.03, except for the addition of a metal L-bracket. One side of the L-bracket shall be securely fastened to the reflector with an aluminum rivet. The other side of the the L-bracket shall have a slot to receive a mounting bolt. The L-bracket shall be fabricated from 12 gauge (2.75 mm) steel and galvanized according to AASHTO M 111 (M 111M).
Referenced in this section
PAVEMENT MARKERS in other states
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Source: Illinois Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 1136–1138 of 1,217. View official source ↗