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California MUT CD 2014 Edition Page 1136 <br />(FHWA's MUTCD 2009 Edition, including Revisions 1 & 2, as amended for use in California) <br />Table GH -3. Recommended Advance Warning Sign Minimum Spacing <br />Road Type <br />Taper Length (L) infeet <br />Distance Between Signs" <br />WSR <br />A B <br />C <br />Urban+w*vpewi}- 26 mph or less"' <br />100 feel <br />100 feel <br />100 feet <br />Urban - more than 25 mph to 40 mph— <br />250 feet <br />250 feel <br />250 feet <br />Urban4hkOwp@@*- more than 40 mph"' <br />350 feet <br />350 reel <br />350 feet <br />Rural <br />500 feet <br />500 feet <br />500 feel <br />Expressway I Freeway <br />1,000 feel <br />1,500 feel <br />2,940 feet <br />" The column headings A, 0, and C are the dimensions shown in Figures 011-1 through 91-1-40. The A <br />dimension Is the distance from the transillon or point of restriction to the first sign. The S 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 95111-parcentile speed prior to work starting, or other anticipated operating speed <br />In mph. <br />Formulas for Determining Taper Length <br />Speed (S} <br />Taper Length (L) infeet <br />WSR <br />40 Mphor less <br />L= --- <br />60 <br />45 mph or more I <br />L= WS <br />Where., L = taper length in heel <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 71110 - <br />operating speed in mph <br />Chapter 6H –Typical Applications November 7, 2014 <br />Part 6 – Temporary Traffic Control <br />