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California MUTCD 2014 Edition <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 (IN) <br />S Merging Shifting Shoulder Down(mph)L U2 U3 Stream <br />(feen (fe~n (feet)ffeen'" <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 of 40 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 i~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 />Page 1137 <br />-. <br />Chapler 6H -Typical Applications <br />Part 6 -TemporaryTrafflc Control <br />November 1,2014