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California MUTCD 2014 Edition Page 1145 <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 Minimm" Spacing <br />Road Type <br />A <br />Distance Between Signs*" <br />B <br />c <br />Urban few-epeeo- 25 mph or lase"" <br />100 feet <br />100 feet <br />100 feel <br />Urban - more than 25 mph to 40 mph*** <br />250 feet <br />250 feet <br />250 feet <br />Urban (L»gNapeaA}- more than 40 mph"' <br />350 feel <br />350 feet <br />350 feet <br />Rural <br />500 feet <br />Soo feet <br />500 feet <br />Expressway/Freeway <br />1,000 feet <br />1,500 feet <br />2,640 feet <br />" The column headings A. B, and Care the dimensions shown In Figures 5H-Vthrough 6H-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-pereenfile 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 />WSz <br />40 mph or less <br />L= — <br />50 <br />45 mph or more <br />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 starting, or the anticipated <br />operating speed in mph <br />Chapter 6H —Typical Applications November 7, 2014 <br />Part 6—Temporary Traffic Control <br />