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California Joint Utility Traffic Control Manual <br /> Table A -Suggested Minimum Advance'Warning Sign Spacing <br /> Posted Speed Distance Between Signs ** <br /> A B C <br /> Urban (low speed) 100 100 100 <br /> 25 mph or less * <br /> Urban (high speed) 350 350 350 <br /> 30 mph or more <br /> Rural 500 500 500 <br /> 55 mph & above 1,000 1,500 2,640 <br /> * Speed category to be determined by highway agency. <br /> ** Distances are shown in feet. The column headings A, B, and C are the <br /> dimensions shown on drawings No. 1-51. The A dimension is the distance from <br /> the transition or point of restriction to the first ;sign. The B dimension is the distance <br /> between the first and second signs. The C dimension is the distance between the <br /> second and third signs. (The third sign is one in a three sign series encountered by a <br /> driver/motorist approaching a TTC zone). <br /> Table B -Taper Length Criteria for Temporary Traffic Control Zones <br /> Type of Taper Taper Length (L) <br /> Merging Taper at least L <br /> Shifting Taper at least 0.51- <br /> Shoulder Taper at least 0.33L <br /> One-Lane, Two-Way Traffic Taper 100 feet maximum <br /> Downstream taper 100 feet per lane <br /> Table C - Formulas for Determining Taper Lengths <br /> Speed Limit Ta er Length (L) Feet <br /> 40 mph or less L = VTS-7/6-0 <br /> 45 mph or more L = VIS <br /> Where: L = taper length in feet <br /> W =width of offset feet <br /> S = posted speed limit, or off peak 85th- percentile speed prior to work <br /> starting. Or the anticipated operating speed in mph <br /> 16 <br />