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California Joint Utility Traffic Control Manual <br /> Table D— Lon itudinal Buffer Space or Flagger Station Spacing on Downgrades <br /> % Downgrade (Buffer Space) <br /> Speed <br /> (mph) 0% -3% -6% -9% <br /> (ft) (ft) (ft) (ft) <br /> 20 115 116 120 126 <br /> 25 155 158 165 173 <br /> 30 200 205 215 227 <br /> 35 250 257 271 287 <br /> 40 305 315 333 354 <br /> 45 360 378 400 427 <br /> 50 425 446 474 507 <br /> 55 495 520 553 593 <br /> 60 570 598 638 686 <br /> 65 645 682 728 785 <br /> 70 730 771 825 891 <br /> Table E — Taper Length Criteria for Temporary Traffic Control zones for 12 feet Offset <br /> Width <br /> Minimum Taper L.ength** <br /> Speed* For Width of Offset 12 ft <br /> S Merging Shifting Shoulder Down <br /> (mph) L U2 U3 Stream <br /> ft ft ft ft *** <br /> 20 80 40 27 50 <br /> 25 125 63 42 50 <br /> 30 180 90 60 50 <br /> 35 245 123 82 50 <br /> 40 320 160 107 50 <br /> 45 540 270 1180 50 <br /> 50 600 300 x'.00 50 <br /> 55 660 330 220 50 <br /> 60 720 360 240 50 <br /> 65 780 390 260 50 <br /> 70 840 4202'80 50 <br /> * Posted Speed, off peak 85th percentile speed prior to work starting, or the <br /> anticipated operating speed. <br /> ** For other offsets use the following merging taper length formula for L: <br /> For speeds of(40 mph) or less (L=WS2/60) <br /> For speeds of(45 mph) or more (L=WS) <br /> *** Maximum downstream taper length is 100 feet. <br /> 19 <br />