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<br />-, <br /> <br />. <br /> <br />r"1 <br /> <br />. <br /> <br />rrype Minimum Size Minimum Number 0 Minimum Legibility Distance <br />Panel Lamps <br />B 30 by 60 inches 13 3/4 mile [1.0 km] <br />[750 by 1,500 mm] <br />C 48 by 96 inches 15 1 mile [1.5 km] <br />[1,200 by 2,500 mm] <br /> <br />.., <br />. <br /> <br />II <br /> <br />. <br /> <br />., <br /> <br />For use on the state highway system, the Types "B" or "C" advance warning arrow <br />boards may be used for low to intermediate (0 to 50 mph) [0 to 80 km/h] facilities and for <br />maintenance or moving operations on high-speed roadways. Type "C" arrow boards shall <br />be used on high-speed (50 mph and up) [80 km/h and up]. <br />(b) Devices shall meet all arrow board displays identified in the MUTCD. <br />(c) The lamp lens should be 5 3/4 inches [145 mm] in diameter. Smaller lamp <br />lens diameters are permissible only if they provide an equivalent or greater brightness <br />indication and meet the legibility criteria in Section (a) of this Specification. <br />(d) The color of the light emitted shall be in accordance with the MUTCD. <br />(e) There shall be a 360-degree hood for close-up glare reduction. <br />(f) For solar powered arrow boards the bulbs shall provide a 350-candle <br />power intensity for day use and an automatic reduction or dimming capacity for night use. <br />The dimmed night operation shall provide adequate indication without excessive glare. <br />(g) The flashing rate of the lamps shall not be less than 25 nor more than <br />40 flashes per minute as required in the MUTCD. <br />(h) The minimum lamp "on time" shall be 50% for the flashing arrow and <br />25 % for the sequential chevron. <br />990-3.4 Electrical System: <br />990-3.4.1 Diesel Engine: Meet the following: <br />(a) The power supply and electrical system shall be self-contained <br /> <br />. <br /> <br />..., <br /> <br />. <br /> <br />.., <br />. <br /> <br />II <br />. <br /> <br />.., <br /> <br />. <br /> <br />..., <br /> <br />. <br /> <br />. <br /> <br />within the unit. <br /> <br />..., <br /> <br />(b) The engine shall have an electrical starting system. <br />(c) The power source furnished shall be of sufficient size so as to <br />provide the required maximum load energy plus 25%. <br />(d) The electrical system shall meet the National Electrical Code <br /> <br />. <br /> <br />.., <br /> <br />. <br /> <br />where applicable. <br /> <br />..., <br /> <br />(e) A backup power system that shall operate the unit for a minimum <br />of three hours automatically when the motor driven generator fails to operate. <br />(f) The starting batteries and back-up power supply system batteries <br />shall be automatically charged when the generator is operating. <br />(g) The engine shall be supplied with an ammeter and the generator <br />shall be supplied with a voltmeter showing voltage to the sign assembly. <br />For solar powered units the following shall apply: <br />(a) The unit shall provide automatic recharging of power supply <br />batteries to normal operating levels. <br />(b) Solar array recovery time shall be accomplished in a maximum of <br /> <br />..., <br /> <br />. <br /> <br />..., <br /> <br />. <br /> <br />. <br /> <br />,., <br />. <br /> <br />three hours. <br /> <br />r-'l <br /> <br />990-3.4.2 Battery Life Test: Meet the following: <br />(a) The photovoltaic unit shall be able to operate from a full battery <br />charge without sunlight for a period of not less than 21 days. <br /> <br />. <br /> <br />., <br /> <br />09/09 <br /> <br />01000-201 <br /> <br />03-4122.F <br /> <br />. <br />