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California MUTCD 2014 Edition <br />(FHWA's MUTCD 2009 Edition, including Revisions 1 & 2, as amended for use in California) Page 1137 <br />Table 6H-4(CA). Taper Length Criteria for Temporary Traffic Control Zones <br />(for 12 feet Offset Width) <br />` - Posted speed limit, off-peak 85kpercenfile 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=WS2/6o <br />For speeds of 45 mph or more, L=WS = <br />Where: L = taper length in feet <br />W= vridth of offset in feet <br />-S-= posteer speedli`mit,—off-peak 85'x-perc-emile speefc 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 OH - Typical Applications November 7, 2014 <br />Part 6 -Temporary Traffic Control <br />