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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 />Chapter 6H – Typical Applications November 7, 2014 <br />Part 6 – Temporary Traffic Control <br />Page 1137 <br />Table 6H-4(CA). Taper Length Criteria for Temporary Traffic Control Zones <br />(for 12 feet Offset Width) <br />Speed* <br />S <br />(mph) <br />Minimum Taper Length** <br />for Width of Offset 12 feet (W) <br />Merging <br />L <br />(feet) <br />Shifting <br />L/2 <br />(feet) <br />Shoulder <br />L/3 <br />(feet) <br />Down <br />Stream <br />(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 /> <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 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.