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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#inir uni Spacing <br /> Road Type Distance Between Signs" <br /> A B C <br /> Urban25 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 4l»944paso-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 /> The column headings A,B,and C are the dimensions shown in Figures 6H-1 through 6H-46. The A <br /> dimension is the distance from the transition or point of restriction to the fust sign. The B dimension <br /> is the dstance 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 dosest 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 6H-4. Formulas for Determining Taper Length <br /> Speed(S) Taper Length(L)in feet <br /> WS2 <br /> 40 mph or less L= — <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 65th-percentile <br /> speed prior to work starting,or the anticipated <br /> operating speed in mph <br /> Chapter 6H–Typical Applications November 7,2014 <br /> Part 6–Temporary Traffic Control <br />