Attachment D _ General Details of Solar RRFB .pdf

ATTACHMENT “D”

GENERAL DETAILS OF SOLAR RRFB INSTALLATION

Minimum Requirements or Approved “Equals To”

Figure 1 – General details of solar powered installation

Notes, Figure 1:

1) Base mounting bolts into cylindrical foundation shall be 14"x3/4" threaded elbow bolts. Conduit for grounding wire shall be installed within concrete.

2) Solar array mounting dependent upon site conditions. Mount as needed to provide adequate sun exposure per manufacturer’s recommendations.

3) Control cabinet shall be heavy duty aluminum keyed with a number 2 lock, time clock, and 1-100 amp/hour gel-cell battery. Controller per project special provisions.

4) Signal pole shall be cylindrical aluminum with an outer diameter of 4.5". Place solar array per manufacturer’s recommendations.

5) Foundation size varies with pole height (Minimum foundation 24" dia. x 40"depth with applicable reinforcement according to engineer’s design and GDOT requirements.

6) Wiring shall meet all NEC standards and local codes.

7) All wires to run through the foundation, transformer base, and inside the aluminum pedestal.

8) All attachments made to aluminum pole shall be banded or bolted as approved by engineer.

9) Installation shall be double-sided.

General Notes:

1) Design and installation of the RRFB in accordance with the 2023 MUTCD (11th Edition)- Rectangular Rapid-Flashing Beacons at Crosswalks.

2) When practical, the RRFB and mounting post on the right side of the road shall be mounted on the approach side of the crosswalk closest to approaching traffic.

3) Locate push button sign IR10-251 and push button to face crosswalk, even if it is mounted on the bock side of the sign.

4) All RRFB units associated with a given crosswalk, including those with an advance crossing sign) shall, when actuated, simultaneously commence operation of their rapid-flashing indications and shall cease operation simultaneously.

5) The RRFB unit associated with a post-mounted sign and plaque may be located between and immediately adjacent to the bottom of the crossing warning sign and the top of the supplemental downward diagonal arrow plaque.

6) Sign foundation is to be concrete per engineer approved design.

7) Contractor to provide/install poles and bases.

8) All hardware, post, push buttons shall have yellow powder finish.

9) Pedestrian beacons shall be actuated via pedestrian pushbuttons and interconnection provided via wireless communications.

10) Light displays to be double-sided for approaching traffic in both directions.

11) Final RRFB assembly hardware and exact location on site shall be approved by City Engineering.

SCHEMATIC OF RRFB INSTALLATION ON TWO WAY ROAD

Figure 2 - Schematic of Standard installation on Two-Way Road (two lanes either direction or one lane either direction)

Notes:

1) Sign is to be placed on the edge of crosswalk closest to the direction of vehicular traffic

2) RFFB units on either side of roadway shall communicate wirelessly for signal coordination

3) Automated signal dimming should be used to minimize glare at night

4) Wig wag plus simultaneous (WW+S) Flash pattern shall be used (see Figure 3)

5) At school crossing locations install two S1-1school zone crossing signs (facing each direction) , RRFBs (facing each direction), and double sided W16-7P plaques (facing each direction) on the pedestal. At other crossings locations install two double-sided W11-15 bicycle/pedestrian crossing signs (facing each direction), RRFB (facing each direction), and W16-7P plaques (facing each direction) on the pedestal.

S1-1 school zone crossing sign

W16-7P plaque

W11-15 bicycle/pedestrian crossing sign

RRFB FLASH PATTERN

Figure 3 - (WW+S) Flash pattern

Notes:

1) Duration of predetermined flash period should be based on the procedures of Section 41.06 of the MUTCD. Pedestrian clearance time should be calculated assuming a 3.0 feet/second speed to give more time for people who are wheelchair bound.

PEDESTRIAN DETECTION

Figure 4 – Audible Information Device

Notes:

1) R10-25 sign shall be used

2) Audible information device shall be as shown in figure 4

3) Message shall say “Warning lights are flashing” and shall be spoken twice.

4) Cannot have vibrotactile indications (to differentiate from Accessible Pedestrian Signal (APS ) used at intersections

Figure 5 – Mounting to ensure ADA Compliance