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California MUTCD Page 6H-5 <br /> (FHWA's MUTCD 2003 Revision 1, as amended for use in California) <br /> Table 6H-3. Meaning of Letter Codes on <br /> Typical Application Diagrams <br /> Distance Between Signs" <br /> Road Type <br /> A B C <br /> Urban (low speed)* 1 30 (100) 30 (100) 30 (100) <br /> Urban (high speed)* 100 (350) 100 (350) 100 (350) <br /> Rural 150 (500) 150 (500) 150 (500) <br /> Expressway/ Freeway 300 (1,000) 450 (1,500) 800 (2,640) <br /> * Speed category to be determined by highway agency <br /> ** Distances are shown in meters (feet).The column headings A, B, and C are the dimensions <br /> shown in Figures 6H-1 through 6H-46.The A dimension is the distance from the transition or <br /> point of restriction to the first sign.The B dimension is the distance between the first and second <br /> signs.The C dimension is the distance between the second and third signs. (The third sign is the <br /> first one in a three-sign series encountered by a driver approaching a TTC zone.) <br /> Table 6H-4. Formulas for Determining Taper Lengths <br /> Taper Length (L) Speed Limit (S) Taper Length (L) <br /> Speed Limit (S} Meters Feet <br /> 60 km/h or less L = WS2 40 mph or less L = WS2 <br /> 155 1 11 60 <br /> 70 km/h or more L __ WS 45 mph or more L =WS <br /> 1.6 <br /> Where: L = taper length in meters (feet) <br /> W = width of offset in meters (feet) <br /> S = posted speed limit, or off-peak 85th-percentile speed prior to work starting, or the <br /> anticipated operating speed in km/h (mph) <br /> (This space left intentionally blank) <br /> Chapter 6H—Typical Applications September 26,2006 <br /> Part 6—Temporary Traffic Control <br />