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,Caillornia MUTCD 2014 Edition(FHWA's MUTCD 2009 Edition,including Revisions 1 &2,as amended for use in Califomia) <br />Table 6H-4(CA).Taper Length Criteria for Temporary Traffic Control Zones <br />(for 12 feet Offset Width) <br />Page 1137 <br />Minimum Taper Length" <br />Speed'for Width of Offset 12 feet (1fII), <br />S Merging Shifting Shoulder Down <br />(mph)L L/2 L13 Stream <br />(feet)(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 85th-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 0140 mph or less,L=WS2/60 <br />For speeds of 45 mph or more,L=WS <br />Where:L =taper length in feet <br />W =width of offset in feetS=posted speed limit,off-peak 85th-percentiie speed prior to work <br />starting,orthe anticipated operating speed in mph <br />.,._Maximum downstream taper length is 100 feet.See Section 6e.08. <br />Chapter 6H -Typical Applications <br />Part 6 -TemporaIY Traffic Control <br />November 7,2014