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section (at a spacing not to exceed 15 feet) and positioned in such a manner as to permit total <br /> right angle observation by parallel traffic . When glare screen is utilized on temporary concrete <br /> barriers , warning lights will not be required. <br /> (e) Prior to approval an impact test shall be performed by the manufacturer to <br /> verify the safety performance of the proposed system . The minimum impact strength of the <br /> posts , blades , rail and the barrier attachment design shall be sufficient to prevent the unit from <br /> separating from the barrier when impacted by a 3 inches outside diameter steel pipe traveling at <br /> 30 mph and impacting mid-height on the glare screen assembly. <br /> ( f) All hardware shall be galvanized in accordance with ASTM A- 123 or stainless <br /> steel in accordance with AISI 302/305 . <br /> Alternative designs for temporary glare screen may be submitted as a Cost <br /> Savings Initiative Proposal in accordance with 4- 3 . 9 . <br /> 4 " <br /> SUBARTICLE 990 -7 . 1 (Pages 965 and 966) is deleted and the following substituted : <br /> 990-7 . 1 General : Temporary Traffic Control Signals shall be one of the products listed <br /> on the APL . Meet the physical display and operational requirements of conventional traffic <br /> signal described in the MUTCD for portable traffic signals . The standard includes but is not <br /> limited to the following : <br /> (a) Use signal heads having three 12 inch vehicular signal indications (Red, <br /> Yellow and Green) . Ensure there are two signal heads for each direction of traffic . <br /> (b) The traffic signal heads on this device will be approved by the Department . If <br /> 1 <br /> (c) Department approved lighting sources will be installed in each section in <br /> accordance with the manufacturer ' s permanent directional marking(s) , that is , an "Up Arrow" , <br /> the word "UP " or "TOP , " for correct indexing and orientation within a signal housing . <br /> (d) The masts supporting the traffic signal heads will be manufactured with the <br /> lowest point of the vehicular signal head as follows : <br /> ( 1 ) Eight feet above finished grade at the point of their installation for <br /> "pedestal" type application or <br /> (2 ) Seventeen to 19 feet above pavement grade at the center of roadway <br /> for "overhead" type application . <br /> (e) The yellow clearance interval will be programmed three seconds or more . <br /> Under no condition can the yellow clearance interval be manually controlled . It must be timed <br /> internally by the controller as per Department specifications . <br /> (f) The green interval must display a minimum of five seconds before being <br /> advanced to the yellow clearance interval . <br /> (g) The controller will allow for a variable all red clearance interval from 0 to <br /> 999 seconds . <br /> (h) Portable traffic control signals will be either manually controlled or traffic <br /> actuated . Indicator lights for monitoring the signal operation of each approach will be supplied <br /> and visible from within the work zone area . <br /> (i) When the portable traffic control signals are radio actuated the following will <br /> apply : <br /> ( 1 ) The transmitter will be FCC Type accepted and not exceed 1 watt . <br /> output per FCC , Part 90 . 17 . The manufacturer must comply with all " Specific limitations" noted <br /> in FCC Part 90 . 17 . <br /> - 251 - <br /> FPID ( S ) : 423186 - 1 - 58 - 01 <br />