715.01 Signs and Channelizing Devices
Meet the Detailed Drawings and MUTCD requirements. Use rigid materials for sign backing. Flexible signs are not permitted. Adjust signs within specified distances to prevent obstruction from or to existing signs. Mount signs so they are vertical and stable. Posts must not extend more than 2 feet (610 mm) above the top of signs. Construction signs may be horizontally hinged at the midpoint of the sign face provided the hinge gap does not exceed ½-inch (13 mm) and the sign legend is legible.
715.02 Construction Sign Support Assemblies
Construct sign support assemblies from lightweight yielding material. Meet the following requirements:
A.Use wood members with a maximum 16 square inch (10,325 mm2) cross section for base construction and 8 square inch (5,160 mm2) cross section for uprights and braces. Provide wood members that are free of bark.
B.Use tubular metal members with a maximum 9 square inch (5,805 mm2) cross section.
C.Use solid metal members with a maximum 1 square inch (645 mm2) cross section. Signs may be portable trailer mounted if:
1.The weight of the trailer assembly does not exceed 250 pounds (113.5 kg).
2.The axle, frame, support assembly, and other structural members cannot exceed the dimensions of the portable sign support assembly; and
3.The trailer tire outside diameter does not exceed 28 inches (715 mm). Automotive and equipment axle assemblies cannot be used for trailer-mounted sign supports.
715.03 Advance Warning Arrow Panels
Furnish advance warning arrow panels (arrow boards) in accordance with Part 6 of the MUTCD, equipped with at least 25 lamps. Use 36 x 72-inch (915 x 1,830 mm) Type “B” arrow boards on striping units and shadow vehicles. Use Type “C”, 48 x 96-inch (1,220 x 2,440 mm) for all other applications. Equip the arrow board with a dimming device to automatically reduce the intensity of the flasher at night.
715.04 Warning Lights
Equip all vehicles, hauling units, and mobile construction equipment operating within the project limits and operating on roadways used by the traveling public with an amber flashing or strobe light visible from all directions for at least 0.4 mile (0.6 km) during daylight and clear weather conditions.
715.05 Advance Warning Signs
Illuminate the W20-7a (advance flagger ahead sign) and the W3-3 (advance traffic signal ahead sign) to meet the following: • Signs may be illuminated either internally or externally. • Use 8 high-power amber LEDs. • Mount LEDs to illuminate each corner of the sign with an additional LED spaced equally between the corners. 715 – TRAFFIC CONTROL DEVICES 2020 EDITION V5.1 715-2 • All LEDs activate simultaneously with a flash rate of 50 to 60 times per minute. • LEDs must be visible a minimum of 1,000 feet upstream from the W20-7a, W3-3 during both daylight and nighttime use. • Power the LEDs using a generator, solar panel, or battery power, or a combination of the three. Meet Subsection 715.02 requirements for mounting portable sign support assemblies and the illumination power source.
Sections that cite this one
Traffic Control Devices in other states
Get an email when 715 changes
Montana revises spec sections through supplementals and new editions. We check this one every week and email you the day it changes. Free, no account.
Source: Standard Specifications for Road and Bridge Construction, 2020 (v5.1) Edition. Pages 599–600 of 611. View official source ↗