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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 6H4(CA). Tapes 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 U2 U3 Stream <br />(feet) (feet) (feet) (feet)#" <br />20 80 <br />40 <br />27 <br />50 <br />25 125 <br />63 <br />42 <br />50 <br />30 180 <br />90 <br />60 <br />50 <br />35 245 <br />123 <br />82 <br />50 <br />40 320 <br />160 <br />107 <br />50 <br />45 540 <br />270 <br />180 <br />50 <br />50 600 <br />300 <br />200 <br />50 <br />55 660 <br />330 <br />220 <br />50 <br />60 720 <br />360 <br />240 <br />50 <br />65 780 <br />390 <br />260 <br />50 <br />70 840 <br />420 <br />296'50 <br />75 900 <br />450 <br />300 <br />50 <br />' - Posted speed limit, off-peak 85'n -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 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 />