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California AWTCD 2012 Edition Page 1136 <br /> (FH-WA's MUTCD 2009 Edition,as amended for use in California) <br /> 'Table 6H-4. 1=ormulas for ID&6iiriiningTaper Ling#h <br /> Speed(S) Tapee Length(L)in feet <br /> ao.6ph or less L <br /> . 60, <br /> 5 To.or more L= Ws <br /> Where.L =taperlenglhMfeet <br /> W=width of ofrsel iri feet <br /> S posted skE d limit,or off-peak 851h•per6enlile <br /> speed prior to starling,or the aivicipated <br /> operalirig 90ee1 in mpli <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(W) <br /> S Merging Shifting Shoulder Down <br /> (mph) L- U2 L/3 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 /> *-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. <br /> Chapter 6H—Typical Applications January 13,2012 <br /> Part 6—Temporary Traffic Control <br /> Temporary Traffic Control(Parts 1 &6)Page 194 of 320 <br />