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California MUTCD 2014 Edition Page 1136 <br /> (FHWA's MUTCD 2009 Edition,including Revisions 1 &2,as amended for use in California) <br /> Table 61-1-3. Recommended Advance Warning Sign Minimum Spacing <br /> Road Type Distance Between Signs— <br /> IF A B c <br /> Urbanpew*pe9O- 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 01411 epwi}-more than 40 mph"' 350 feet 350 feet 350 feet <br /> Rural 500 feet 500 feet 500 feet <br /> Expressway f Freeway 1,000 feet 1,500 feet 2,640 feet <br /> " The column headings A,B.and C are the dimensions shown in Figures 6H-1 through 61-1-46. 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 percentile speed prior to work starting,or other anticipated operating speed <br /> in mph. <br /> Table 61-1-4. Formulas for Determining Taper Length <br /> Speed(S) Taper Length(L)in feet <br /> 40 mph or less L= wS;I <br /> 60 <br /> 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,or off-peak 85th-percentile <br /> speed prior to work slarting,or the anticipated <br /> operating speed in mph <br /> Chapter 6H—Typical Applications November 7,2014 <br /> Part 6—Temporary Traffic Control <br />