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2003 Edition Page 6H-5 <br /> Table 6H-3. Meaning of Letter Codes on <br /> Typical Application Diagrams <br /> Road Type Distance Between Signs" <br /> A B C <br /> Urban (low speed)* 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) Taper Length (L) <br /> Speed Limit(S) Meters Speed Limit(S) <br /> Feet <br /> 60 km/h or less L= 552 40 mph or less L= WS2 <br /> 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 /> Sect.6H.01 <br />