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California MOTCD 2014 Edition Page 1139 <br />(FHWA's &IETCD 2009 Edition, including Revisions 1 & 2, as amended for use in California) <br />Table 611-3. Recommended Advance Warning Sign MkilifmumSpacing <br />Road Type <br />Taper Length (L) in feet <br />Distance Between Signs - <br />WS' <br />A B <br />C <br />UrbanXewapeeq-25 mph or less— <br />la0fast <br />I 100feet <br />loosest <br />Urban - more than 25 mph to 40 mph"' <br />250 feet <br />250 feet <br />250 feet <br />Urban(pgAspw9'-mom than 40 mph"' <br />350 feet <br />350 feet <br />350 fist <br />Rual <br />Snn feet <br />Snn kel <br />Sn'feel <br />Expressway l Freeway <br />1,000 feet <br />1,500 feet <br />2,640fiet <br />The column headings A, B, and Care the dimensions shown in Figures 611-1 through 61146. The A <br />dimension is the distance from the transition or point of restriction to Ne 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 °thial 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 611-4. Formulas for Determining Taper Length <br />Speed (S) <br />Taper Length (L) in feet <br />WS' <br />40 mph or less <br />L= <br />60 <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 />