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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 Minimum*Spacing <br />Road Type <br />A <br />Distance Between Signs** <br />B <br />c <br />Urban+ww-speed}- 25 mph or less*** <br />100 feet <br />100 feet <br />100 feet <br />Urban - more than 25 mph to 40 mph*** <br />250 feet <br />250 feet <br />250 feet <br />Urban JW@lo speed}- more than 40 mph*** <br />350 feet <br />350 feet <br />350 feet <br />Rural <br />500 feet <br />500 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 C are the dimensions shown in Figures 61-1-1 through 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 -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 />WS? <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 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 />