for Highway Construction Page 686 of 71 5 SECTION 712 – SIGNING MATERIALS
712.01 Plywood for Type E Signs.
Meet U.S. Product Standard for Construction and Industrial Plywood.
712.02 Retroreflective Sheeting.
Supply retroreflective sign sheeting meeting ASTM D4956 standards for class ification , color, and performance.
1.Sheet Aluminum and Plywood Signs. Provide Type IV direct applied retroreflective sheeting for signs with white backgrounds. Provide Type XI direct applied retroreflective sheeting for all other backgrounds. Provide XI direct applied retroreflective sheeting for white sign legends.
2.Extruded Aluminum Sign Panels. Provide Type XI direct applied retroreflective sheeting for the background and legend.
3.Temporary Traffic Control Devices. Provide Type IV (minimum) direct applied retroreflective sheeting.
4.Delineator s and Snow Pole Reflectors. Provide Type IV (minimum) direct applied retroreflective sheeting.
712.03 to 712 .06 Reserved.
712.07 Silk Screen Opaque Inks.
Apply opaque silk screen inks in accordance with the manufacturer’s written instructions, waterproof for outdoor use, and dry within 18 hours to a film without running, streaking, bubbling, or sagging. Visually match opaque colored silk screen inks within the limits of the current color tolerance charts pr epared by the FHWA.
712.08 Silk Screen Transparent Inks.
Apply transparent silk screen inks of the desired color onto reflective sheeting background meeting the requirements of 712.02.
712.09 Direct Applied Nonreflective Sheeting and Direct Applied Transparent Films .
Direct applied nonreflective sheeting consists of flexible, glossy sheeting. Direct applied transparent films consist of transparent, acrylic colored films. Use solvent resistant sheeting and films that are precoated with Class 1 pressure sensitive, tack -free adhesive on the back side. Ensure the sheeting and films are applied in accordance with the manufacturer’s written instructions, to form a durable bond with the background enabling it to withstand severe weather conditions.
712.10 Flexible Posts for Deli neators.
Provide flexible posts for delineators as follows:
1.White or as otherwise specified.
2.Drivable with a steel stub or sleeve. for Highway Construction Page 687 of 715 3. Flexible, nonwarping, nonmetallic, durable composite material.
4.Resistant to damage due to impact, ultraviolet light, ozone, hydrocarbons, and other effects of atmospheric weathering.
5.Resistant to overturning, twisting, and displacem ent from wind and impact forces.
6.Maintain flexibility for a 5- year minimum design life.
712.11 Flexible Snow Pol es.
Provide orange poles meeting the following:
1.One and one quarter (1¼) inches wide by ⅜ inch thick and a length as specified.
2.Nonwarping, nonmetallic, and durable fiber reinforced composite material.
3.Resistant to impacts as a result of snow plowing or twisting.
4.Resistant to displacem ent from wind, ultraviolet light, ozone, hydrocar bons, and other effects of atmospheric weathering. Maintain flexibility for a 5- year minimum design life. for Highway Construction Page 688 of 71 5 SECTION 713 – ILLUMINATION AND TRAFFIC CONTROL SIGNAL MATERIALS
713.01 Signal Poles & Structures .
Obtain approval of the submitted shop drawings before fabrication begins for non- standard steel signal poles .
A.Signal Poles . Provide poles that have a 4 inch by 6.5 inch frame and cover located 90 degrees to the right of the mast arm location. Permanently display the signal mast arm shaft (gauge) thickness in inches on each mast arm near the attachment plate (nonstandard poles only). Provide signal poles that meet the requirements for standard or nonstandard mast arm traffic control signal poles , pedestal signal poles, and pedestrian pushbutton poles with materials as specified in 708.19 . and the following additional requirements:
1.Standard mast arm traffic control signal pole requirements:
a.Maximum nominal pole height, including luminaire extension, of 40 feet.
b.Maximum luminaire mast arm length of 15 feet.
c.Maximum signal mast arm length of 55 feet.
d.Use Department approved signal pole designs.
e.Meet additional standard mast arm traffic control signal pole criteria as specified.
f.Provide 4 steel anchor bolts of the manufacturer’s recommended size with each pole. Fit each bolt with 3 nuts and 2 washers.
g.Submit shop drawings and calculations for approval before fabrication.
2.Nonstandard mast arm traffic control signal pole r equirements:
a.Designed in accordance with the current AASHTO LRFD Standard Specifications for Structural Supports for Highway Signs, Luminaires, and Traffic Signals.
b.For signal mast arm length greater than 55 feet or luminaire mast arm length greater than 20 feet, use fatig ue category I design criteria (fatigue design will include natural wind gust, periodic galloping forces, and truck -induced wind gust loads based on a truck speed of 65 mph).
c.Provide 4 steel anchor bolts of the manufacturer’s recommended size with each pole. Fit each bolt with 3 nuts and 2 washers. Include 1 extra anchor bolt per batch for destructive testing.
d.Submit shop drawings and calculations for approval before fabrication.
3.Pedes trian signal pole requirements:
a.A 4-inch rigid galvanized conduit with national pipe tapered (NPT) threads.
b.A square, frangible cast aluminum base that is:
1.Fifteen (15) inches high.
2.Nominal dimension of 14 inches by 14 inches.
3.Four (4) slotted holes for anchor bolts .
Source: Idaho Standard Specifications for Highway Construction, 2023 Edition. Pages 722–723 of 768.