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California MUTCD 2014 Edition Page 1032 <br /> (FHWA's MUTCD 2009 Edition,including Revisions 1 &2,as amended for use in California) <br /> Table 6C-1. Recommended Advance Warning Sign MiMmum•Spacing <br /> Road Type Distance Between Signs" <br /> A B C <br /> Urban(leh-ape -25 mph or less"' 100 feet 100 feet 100 feet <br /> Urban-more than 25 mph to 40 mph"' 250 feet 250 feet 250 feet <br /> Urban+4gI*apao4-more than 40 mph" 350 feet 350 feet 350 feet <br /> Rural 500 feet 500 feet 500 feet <br /> Expressway/Freeway 1,000 feet 1,500 feet 2,640 feet <br /> . SI-------��._.._..._._:-_..lTr <br /> -' The column headings A,B,and Care the dimensions shown in Figures 6H-1 through 61,148.The A <br /> dimension is the distance from the transition or point of restriction to the first sign. The B dimension <br /> is the distance between the first and second signs. The C dimension Is the distance between the <br /> second and third signs (The'first sign"is the sign in a three-sign series that is closest to the TTC <br /> zone. The`third sign"is the sign that is furthest upstream from the TTC zone.) <br /> Posted speed limit.off-peak 85th-percentde speed prior to work starting,or other anticipated operating speed <br /> in mph <br /> Table 6C-2. Stopping Sight Distance as a Function of Speed on Level Roads. <br /> (Used as suggested longitudinal buffer space length or location for flagger station) <br /> Speed` Distance <br /> 20 mph 115feet <br /> 25 mph 155 feat <br /> 30 mph 200 feet <br /> 35 mph 250 feet <br /> 40 mph 305 feet <br /> 45 mol, 360 feet <br /> 50 mph 425 feet <br /> 55 mph 495 feet <br /> 60 mph 570 feet <br /> 65 mph 6:5 feet <br /> 70 mph 730 feet <br /> 75 mph 820 feet <br /> Posted speed,off-peak 85th-percentile speed prior to work <br /> starting,or the anticipated operating speed in mph. <br /> Table 6C-3. Taper Length Criteria for <br /> Temporary Traffic Control Zones <br /> Type of Taper Taper Length <br /> Merging Taper at least <br /> Shifting Taper at least 0.5 L <br /> Shoulder Taper at least 0.33 L <br /> One Lane,Two-Way Traffic Taper 50 feet minimum,100 feet maximum <br /> Downstream Taper 50 feet minimum,100 feet maximum <br /> Note'.Use Table 6C-4 to calculate L <br /> Chapter 6C—Temporary Traffic Control Elements November 7,2014 <br /> Part 6—Temporary Traffic Control <br />