for Highway Construction Page 597 of 71 5 SECTION 657 – FLASHING BEACONS
657.01 Description.
Provide and install beacons and Rectangular Rapid Flashing Beacons (RRFB).
657.02 Materials.
Provid e materials as specified in: Concrete ...................................................................................................................................... 502 Signs and Sign Supports .............................................................................................................. 616 Traffic Signal Installation ............................................................................................................... 656 Traffic Signal Materials ................................................................................................................ 713 Use Class 40 A concrete for pole foundations.
A.Beacons. Provide 120- volt AC power ed or solar powered beacons as specified . The AC powered beacon assembly consists of pole, foundation, flashers (signal indications), signs, controller cabinet, conduit, mounting hardware, and hardware to complete the assembly. The solar powered flashing beacon assembly consists of pole, foundation, solar panel, flashers (signal indicat ions), signs, controller cabinet, battery cabinet, batteries, wireless communications hardware, conduit , mounting hardware, and hardware to complete the assembly. Provide beacons with two alternately flashing circular yellow signal sections which flash at a rate of at least 50 or more than 60 times per minute and where the illuminated period of each flash is at least ½ and not more than 2/3 of the total cycle. Ensure beacons dim to automatically adjust brightness. Provide NEMA 3R enclosures. When solar powered, size solar panels and batteries to ensure 100, 30- second, activations per day for up to 14 days between charging. Provide copies of calculations used to size the solar panels and batteries. Ensure batteries are installed in a weatherproof enclosure to ensure that exposure to the weather will not interf ere beacon operation.
B.Rectangular Rapid Flashing Beacons (RRFB). Provide 120- volt AC powered or solar powered RRFBs as specified. The AC powered RRFB assemblies consist of a paired crosswalk assembly of poles, foundations, RRFBs, signs, pushbutton assemblies, controller cabinet, conduit , and mounting hardware. The solar powered RRFB assemblies consists of a paired crosswalk assembly of poles, foundations, solar panels, RRFBs, signs, pushbutton assemblies, controller cabinet, battery cabinet, batteries, wireless communications hardware, conduit, mounting hardware, and hardware to complete the assembly. Ensure the peak luminous intensity (candelas) meet the requirements of SAE J595, Class 1. When actuated by a pedestrian, ensure the RRFB provides 75 flashing sequences per minute. Ensure the left and right RRFB indications operate as follows during each 800‐ millisecond flashing sequence:
1.Illuminate the left ‐hand side indication for approximately 50 milliseconds. for Highway Construction Page 598 of 71 5 2. Darken both indications for approximately 50 milliseconds.
3.Illuminate the right ‐hand side indication for approximately 50 milliseconds.
4.Darken both indications for approximately 50 milliseconds.
5.Illuminate the left ‐hand side indication for approximately 50 milliseconds.
6.Darken both indications for approximately 50 milliseconds.
7.Illuminate the right ‐hand side indication for approximately 50 milliseconds.
8.Darken both indications for approximately 50 milliseconds.
9.Illuminate the both indications for approximately 50 milliseconds.
10.Darken both indications for approximately 50 milliseconds.
11.Illuminate the both indications for approximately 50 milliseconds.
12.Darken both indications for approximately 250 milliseconds. Ensure paired RRFB installations simultaneously illuminate and darken. Equip each RRFB with an automatic signal dimming device to reduce illumination levels duri ng periods of reduced ambient light. Provide NEMA 3R enclosures. When solar powered, size solar panels and batteries to ensure 100, 30- second, activations per day for up to 14 days between charging. Provide copies of calculations used to size the solar panels and batteries. Ensure batteries are installed in a weatherproof enclosure to ensure exposure to the weather will not interfere RRFB operation.
657.03 Construction Requirements.
A.Beacons. Install beacons as specified. Provide controller enclosure k eys.
B.Rectangular Rapid Flashing Beacons (RRFB). Install RRFBs as specified and manufacturer’s written instructions. Provide controller enclosure keys. When actuated by a pedestrian, operate the RRFBs for 30 seconds unless otherwise specif ied.
657.04 Method of Measurement.
The Engineer will measure acceptably completed work as follows:
1.Beacons will be per each assembly.
2.RRFBs will be per each assembly.
657.05 Basis of Payment .
The Department will pay for accepted quantities at the contract unit prices as follows: Pay Item Pay Unit Beacons, AC Powered ............................................................................ Each for Highway Construction Page 599 of 71 5 Beacons, Solar Powered ........................................................................ Each RRFB, AC Powered ................................................................................ Each RRFB, Solar Powered ............................................................................ Each Separate payment will not be made for signs or traffic signal materials. 658-674 for Highway Construction Page 600 of 715 SECTIONS 658 -674 - RESERVED for Highway Construction Page 601 of 71 5 SECTION 675 – SURVEYING
675.01 Description.
Surveying includes scheduling, coordinating, and providing construction surveying, field and pl an measurements, confidence point checks, grade verification point checks, calculations necessary for completing the work and to properly control the work in its entirety, and quantity computations for pay items requiring volume measurements. Measurement of all other pay quantities is excluded from this item of work. Perform work as specified and in accordance with standard engineering and surveying practices under the responsible charge of a professional engineer or an Idaho licensed PLS. Any work that falls under 54 1202(11), Idaho Code (e.g., setting centerline control, resetting land corners, locating property lines , setting right of way monuments, creating authoritative control positions) is required to be completed by an Idaho licensed PLS. Select the PLS for work required under this section from the survey firms currently listed under the Department’s consultant term agreement list (i.e., category C -1a, C -2, or C -3).
A.General. The Contractor is responsible for survey and control. Correcting errors made by the Contractor will be at no additional cost to the Department, whether the errors are discovered during the actual survey work or in subsequent phases of the work. The Engineer has the right to communicate directly with the surveyor.
B.Personnel. Furnish technically qualified survey crews and a crew supervisor experienced in highway and bridge surveying and layout. The qualified crew supervisor will be on the project site whenever surveying or staking is in progress.
C.Equipment. Furnish survey instruments and support ing equipment capable of achieving the specified tolerances. Check survey equipment for accuracy before beginning survey work and as required.
D.Submittals. Submittals for any work that falls under 54- 1202(11), Idaho Code must be signed and sealed by an Idaho licensed PLS. All other work under this item may be signed and sealed by an Idaho licensed engineer or PLS. Resubmittals may be required depending on completeness and correctness of the work. Initial ground disturbing activities or bridge deck construction is not allowed until the Contractor is notified in writing to procee d. Notification will be provided within 7 calendar days after receipt of the applicable submittal or any resubmittals. Notification to proceed does not relieve the Contractor of its responsibility to maintain the surv ey work and to correct errors, regardless if the errors are discovered during the actual survey work or in subsequent phases of the work. Full payment will not be made on the surveying contract pay item until all survey submittals are received and accepted.
E.Department -Provided Information. The Department will furnish the following data: Plans showing locations of control points at the beginning and the end of the project (e.g., point of intersection of tangents, point of curvature, point of tangency of horizontal curves, point on curve, point on tangent) that have been collected in the development of the plans, if any.
1.Plans showing locations of benchmarks, if any.
Source: Idaho Standard Specifications for Highway Construction, 2023 Edition. Pages 633–636 of 768.