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California MUTCD 2014 Edition Page 1137 <br /> (FHWA's MUTCD 2009 Edition,including Revisions 1 &2,as amended for use in California) <br /> Table 6H-4(CA).Taper Length Criteria for Temporary Traffic Control Zones <br /> (for 12 feet Offset Width) <br /> Minimum Taper Length" <br /> Speed- for Width of Offset 12 feet(W) <br /> S Merging Shifting Shoulder Down <br /> (mph) L L12 L13 Stream <br /> (feet) (feet) (feet) <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 /> 45 540 270 180 50 <br /> 50 600 300 200 50 <br /> 55 660 330 220 50 <br /> 60 720 360 240 50 <br /> 65 780 390 260 50 <br /> 70 840 420 280 50 <br /> 75 900 450 300 50 <br /> Posted speed limit,off-peak 85'h-percentile speed prior to work starting, or the anticipated operating <br /> speed in mph. <br /> For other offsets use the following merging taper length formula for L: <br /> For speeds of 40 mph or less, L=WS2160 <br /> For speeds of 45 mph or more,L=WS <br /> Where: L=taper length in feet <br /> W=width of offset in feet <br /> S= posted speed limit,off-peak 85th-percentile speed prior to work <br /> starting,or the anticipated operating speed in mph <br /> Maximum downstream taper length is 100 feet. See Section 6C.08. <br /> Chapter 6H—Typical Applications November 7,2014 <br /> Part 6—Temporary Traffic Control <br />