2856 K shall be 0.440.
5.Lens Material The lens shall be plastic of one-piece construction and shall meet the test requirements in accordance with SAE J 576b, except that the exposure time and condition, paragraph 3.4.3, for the purposes of this standard shall be one year.
d.Head and Case 1. Swivel Head 120 If swivel capabilities as described herein are not incorporated in the device used to mount a type A or C light on a barricade or sign, the head shall be mounted on the housing in a manner allowing it to be swiveled through a minimum 90° arc in a horizontal plane. If swiveling is accomplish ed by rotation of the head, construction shall be such that the head rotation shall not damage the wiring. 2 . C a s e The case shall be so constructed and closed as to exclude moisture that would affect the specified operation of the light. The case shall have a weephole to allow the escape of moisture from condensation. 130
e.Photoelectric Controls Photoelectric controls, if provided on types A or C lights, shall keep the light operating whenever the ambient light falls below 20 footcandles.
923.04 Flashing Arrow Sign The flashing arrow sign shall be an all weather, self-contained, flashing sign
designed to display the required flashing messages continuously for a minimum of 24 h without servicing. A reserve storage battery shall be provided to automatically 923.04 1201 operate the flashing arrow sign for a minimum period of 8 h if there is a power failure 140 of the primary source. The flashing arrow sign shall have a control unit which incorporates a photo-controlled transfer relay for automatic lamp intensity settings. The highest photo-controlled setting shall be full intensity for daylight operation. The lowest photo-controlled setting shall be for night- time operation and shall be 50% of full intensity when the ambient light level drops below five footcandles. A minimum of two interim photo-controlled settings shall automatically increase or decrease the lamp intensity in direct proportion to the ambient light level. 150 The flashing arrow sign shall have a manual control unit for adjusting lamp intensity when automatic operation becomes unsatisfactory. The manual control shall be fully adjustable between the minimum limit of 30% of full lamp voltage and maximum limit of full lamp voltage. An indicator light shall be provided on the back of the sign to provide confirmation that the flashing arrow sign is operating. The indicator light shall be visible for 500 ft.
a.Solar Powered 160 Solar power assisted units shall incorporate a target sight device and leveling mechanism to aid the user for positioning of the unit prior to use. The device shall be attached to the elevated portion of the flashing arrow sign and not to the fixed support frame. The lamps shall be electronically operated by means of a solid state controller. An automatic lamp intensity regulator shall hold the lamp output constant with varying battery voltage. The control system shall incorporate a full-time tracking system designed to track ambient light for 24 h a day. The control system shall adjust lamp intensity to provide maximum system efficiency. The controller shall be in a 170 weatherproof, ventilated, lockable enclosure. The lamps shall provide amber beams with a minimum of 20° horizontal and 6° vertical field of view. The minimum effective luminance within the required beam shall not be less than one-half the ef fective luminance at the beam center. The battery bank shall consist of 12V, deep cycle batteries. The battery bank shall be of sufficient capacity to power the unit for 15 days with no assistance from the sun. A battery condition indicator and a test switch shall be provided to monitor the battery charge of the system. The batteries shall be secured in a well ventilated, weatherproof 180 lockable housing. A low battery charge indicator which shall be visible to maintenance personnel driving past the sign shall be provided to indicate the need to recharge the batteries. The battery bank shall be at full charge when delivered to the project site. 923.04 1202 The unit shall be equipped with a sign/solar panel lifting mechanism. The lifting mechanism shall be designed to safely carry the capacity of the sign’s load. The lifting mechanism shall incorporate a positive locking device to secure the panel in a raised or lowered position. Solar power assisted flashing arrow signs to be used shall be selected from the 190 QPL of Solar Power Traffic Control Devices.
b.Diesel Powered Flashing arrow sign shall be fu eled by diesel fuel only.
c.AC Powered When connected to an AC electrical power source, provisions shall be made to prevent electrocution. [continued on next page] 923.04 1203FLASHING ARROW SIGN GENERAL SPECIFICATIONS 200 TypeA T ypeB T ype C SOLAR POWER ASSISTED Minimum Board Size 2 ft high by 4 ft wide**2.5 ft high by 5 ft wide4 ft high by 8 ft wide4 ft high by 8 ft wide Minimum No. of Lamps Flashing Arrow Flashing Double Arrow Sequential Chevron (3 heads minimum )5 in. head, 5 in. shaft* 5 in. head, 4 in. shaft* 5 in. head(See Note)Same as Type A5 in. head, 5 in. shaft* 5 in. head, 3 in. shaft* 7 in. shaft Lamp TypeSealed Beam: 12.8V, not to exceed 3A Average rated life: 300 h minimum Candlepower: 1000 candles minimum 9700 candles maximum(See Note)Same as Type ASealed Beam: 12.8V, not to exceed 3A Average rated life: 300 h minimum Candlepower: 600 candles at normal voltage and >250 candles at low voltage Lens Color Amber Amber Amber Amber Board Color Flat Black Flat Black Flat Black Flat Black Flashing Rate30-50 F.P.M. (50% on time )25-40 F.P.M. (50% on time )30-50 F.P.M. (50% on time )25-40 F.P.M. (50% on time ) Message (Left or Right)Flashing Arrow, Flashing Double Arrow, or Sequential ChevronFlashing Arrow, Flashing Double ArrowFlashing Arrow, Flashing Double ArrowFlashing Arrow, Flashing Double Arrow, or Warning Bar Minimum mounting height (to bottom of board )7 ft 7 ft 7 ft 7 ft Where Allowed Where normal sp eed limit is <40 mph (See Note)All rural and urban locationsStationary Operations Tangent Sections (See 801.15(a)) Required minimum Visibilit y 0.5 mi 0.75 mi 1 mi 1 mi * When flashing a single or double arrow(s), the lamp (s) nearest the arrow points shall not be illuminated. ** Either rectangular or arrow shaped black background sign will be allowed. Note: General s pecifications for a T ypeB f l a s h i n g arrow si gn are shown in the MUTCD. 923.04 1204 923.05 Portable Changeable Message Sign Portable changeable message signs shall be capable of displaying 3 lines with 8 characters per line. Letter height shall be a minimum of 18 in. The sign shall have automatic dimming capability for nighttime operation. Portable changeable message signs shall be selected from the QPL of Solar Power Traffic Control Devices. 923.06 Temporary Worksite Speed Limit Sign Assembly The temporary worksite speed limit sign assembly shall be an all weather, self-contained unit designed to display speed limit signs in accordance with the 210 MUTCD and as shown on the plans. The signs shall be installed on frangible posts or mounted on movable stands or trailers in accordance with 910.14(f). The power source shall be capable of operating the strobe lights, without service, for the period which the sign is in effect. An on/off switch will be required.
923.07 Tubular Marker
The vertically placed portion of this device shall consist of high density polyethylene plastic in accordance with ASTM D5203. The base material shall be butyl rubber in accordance with ASTM D5900 or high impact polystyrene in accordance with ASTM D4549. E poxy material used to attach the base to the roadway 220 surface shall be in accordance with the ma nufacturer’s recommendations. The tubular portion shall be reflectorized with high intensity reflective sheeting in accordance with 919.01(b)1 as shown on the plans. 923.08 Automated Flagger Assistance Device The Automated Flagger Assistance Device, AFAD, shall alternately display either a STOP sign and a SLOW sign or a steadily illuminated CIRCULAR RED and a flashing CIRCULAR YELLOW lens to control traffic while being operated by a handheld remote control. AFADs shall meet the requirements of the Indiana Manual on Uniform Control Devices, Chapter 6E. Each AFAD shall be equipped with two 230 handheld remote controls. Trailer mounted AFAD’s shall be equipped with a gate arm. Only automated flagger assistance devices from the QPL of Solar Powered Traffic Control Devices shall be used. Automated flagger assistance devices will be placed and maintained on the QPL in accordance with ITM 955. (a) Signs
1.STOP/SLOW AFAD The STOP and SLOW signs shall have a minimum width of 24 in. with lettering 240 that is at least 8 in. in height. The WAIT ON STOP sign shall be visible along the same line of view of the STOP sign face. 2. RED/YELLOW Lens AFAD A “STOP HERE ON RED”, R10-6 or R10-6a, sign shall be installed on the right- hand side of the approach at the point at which drivers are expected to stop when the CIRCULAR RED lens is illuminated. 923.05 1205 (b) Signals Red/Yellow lens AFAD shall have at least one set of CIRCULAR RED and 250 CIRCULAR YELLOW lenses that are 12 in. in diameter and in accordance with the Institute of Transportation Engineers, ITE, Purchase Specification for Vehicle Traffic Control Signal Heads. (c) Supplemental Conspicuity Devices The STOP sign face in STOP/SLOW AFAD shall be supplemented by a circular, red stop beacon. The SLOW sign face shall be supplemented by either: a circular, yellow warning beacon, or Type B warning lights with a minimum viewing distance of 1,000 ft. 260
d.Gate Arm Gate arms shall be made of reinforced thermoplastic or tubular aluminum. When in the horizontal positions the arm shall have a 2 ft to 4 ft mounting height above the pavement surface. (e) Cabinets and Controller The battery and controller cabinets sha ll be in accordance w ith NEMA Standard 250 Enclosure 3R requirements and be provided with a hasp and lock. The AFAD shall include a manual override of the handheld remote at the device. The AFAD shall not have any means by which it can operate on a pre-set or pre-timed basis. 270
f.Remote Control Device Two handheld, cordless remote controls shall be provided with each AFAD. The remote control shall be waterproof and disp lay signal receipt confirmation. The remote shall use a frequency hopping, spread spectrum radio signal with frequencies outside the 700 MHz band, 698 MHz to 806 MHz. The remote control device shall be programmable to control either one unit or two units simultaneously and shall control the units over a one-mile range.
g.Batteries and Charging System 280 Batteries shall be deep cycle type and be capable of operating the AFAD continuously for two days, 24 hrs per day without a need of re-charging. An audible low battery voltage alarm sound system shall be provided. The battery charging system shall consist of a solar panel. Solar panels shall be UL 1703 certified.
h.Trailer The trailer, if used, shall be designed to withstand a 60 mph wind loading with a 1.3 gust factor when the AFAD is set up in operating position. The trailer shall be painted safety orange, SAE-AMS-STD-595, color No. 12300. The trailer shall be provided with a minimum of two leveling jacks, each operated by a crank which locks 290 in place.
923.09 Acceptance of Temporary Traffic Control Devices Temporary traffic control devices will be accepted by visual inspection unless
otherwise indicated. 923.09
Source: Indiana Standard Specifications, 2024 Edition. Pages 1202–1206 of 1,248.